MPA Logo, San Francisco Maritime National Park Association, USS Pampanito, Historic Ships at Hyde Street Pier, Education Programs Maritime Park Association Home Page Maritime Park Association Home Page Events Maritime Park Association Home Page Maritime Park Association Home Page Maritime Park Association Home Page Volunteer Membership Donate Maritime Park Association Home Page USS Pampanito Submarine Historic Ships at Hyde Street Pier Education Programs About Maritime Park Association Home Page Directions to Maritime Jobs at Maritime Facility Rental at Maritime Trustees of the Association Calendar Press Room Store Maritime Map
 

57
 
Chapter 8
SIGHTS
5-INCH SIGHTS MARK 42 AND MARK 42 MOD. 2
 

GENERAL DESCRIPTION

1. Sights Mark 42 and Mark 42 Mod. 2 are mechanical sight setting mechanisms for offsetting telescope optics and open sights at the pointer's and trainer's stations. Each functions for gun laying in local control (pointer fire). Plate 20* is a phantomized view of Sight Mark 42. Plate 21 illustrates the same assembly completely assembled and with cross tube and brackets removed.

2. Design differences. Sight Mark 42 was designed for installation of Mark 39 series telescopes. Sight Mark 42 Mod. 2 is identical with Sight Mark 42 except for the telescope and telescope holder arrangements. At present all the subject mounts are fitted with Sight Mark 42. New plans, still in the design stage, call for refitting all mounts with Sight Mark 42 Mod. 2. This will be accomplished by Ordalt for mounts in service. Features of Sight Mark 42 Mod. 2 which will differ from Sight Mark 42 are as follows:

(a) Telescope. Telescope Mark 91 is used. It is an illuminated binocular sight.

(b) Standby binocular. This is a standard binocular. It is not normally secured to the mount, but-may be secured in place of Telescope Mark 91. Other new features of Sight Mark 42 Mod. 2 are described in paragraph 10. Figure 21 illustrates Telescope Mark 91. All other illustrations of this pamphlet illustrate Sight Mark 42 with Telescope Mark 39 Mod. 4 installed.

3. Limits of operation. Sight angle may be set from 0° to 40° (corresponding to a range of 14,500 yds.), but interference between the sight optics and the handwheel brackets does not permit a sight angle greater than 28° to be introduced with the gun at 0° elevation (see MAINTENANCE AND OPERATING INSTRUCTIONS, par. 13). A maximum of 12° deflection angle, right or left, may be set with the deflection handwheel.


* The slide counterbalance weight has been omitted for clarity.
  4. Components. The sight comprises the following elements and assemblies described in this chapter in the order listed:

Brackets
Sight detent
Drum assembly
Telescope Mark 39 (Sight Mark 42)
Telescope Mark 91 (Sight Mark 42 Mod. 2)
Open sights

5. Bracket assemblies. The sight mechanism and sight optics are mounted in, and supported by, the bracket castings and cross tube described in the following subparagraphs. Plate 21 illustrates the mechanism removed from the mount with and without the brackets in place.

(a) Counterweight brackets. These are similar steel castings which support the entire sight assembly, and in which are bolted the sight counterweights. The weights are 150-pound lead castings which serve to counterbalance the optics as the sight is moved on the elevation arcs (par. 6) about its pivots. Cylindrical bores in the brackets carry the bearings for the slide trunnion clips (described in ch. 3) which support and form the pivot for the sight assembly. The right counterweight bracket weighs 47 pounds. The left bracket has an integral pad bored to receive the detent described in paragraph 7; it weighs 48 pounds.

(b) Right hand bracket. This bracket is a 68-pound steel casting (fig. 24) which is bolted to the top of the right counterweight bracket. It supports the end of the deflection shaft in transverse bushings, and the deflection arc shaft in vertical bushings. A vertical thrust bushing supports the right hand deflection wormwheel shaft in the bottom of the bracket and a transverse bushing supports the right end of the sight angle pinion shaft. The left end of the bracket forms a flange mounting for the right end of the cross tube.

(c) Left hand bracket. This 72-pound steel casting (fig. 25) is similar to the right hand bracket

 

58
 

PLATE 20, 5-Inch Sight Mark 42
PLATE 20

 

59
 
(subpar. (b) above) and is mounted on top of the left counterweight bracket. In addition to the bearing supports for the deflection arc shaft, deflection wormwheel shaft, deflection shaft, and sight angle pinion shaft, it also provides bearing support for the sight angle worm shaft. The top of this casting is machined to provide a flange mounting for the cover for the sight angle and deflection drums. The right end of the bracket forms a flange mounting for the left end of the cross tube.

(d) Cross tube. The cylindrical cross tube (fig. 26) is a 70-pound steel casting which serves to tie the right hand and left hand brackets together in a rigid structure. It also houses and supports the sight angle pinion shaft. Two sets of vertically arranged openings are provided to permit access to the two couplings in this shaft (see ADJUSTMENTS, par. 14). Two additional openings in the bottom of the tube permit the sight angle pinions to engage the elevation arcs on the slide (par. 6).

(e) Telescope support brackets. The pointer's and trainer's telescope support brackets are identical, but of opposite hand. They are steel castings of the form and arrangement illustrated on plate 21. Each provides mounting for a Telescope Holder Mark 29 and Telescope Mark 39. The bracket supports the telescope in a cylindrical clamp, and pivots on the vertical shaft mounted in the hand hand or left hand sight bracket. The arc-shaped drive bracket rigidly connects the support bracket to the deflection arc to transmit motion of the latter to the optic. (Bracket arrangement for Telescope Mark 91 will be as indicated in paragraph 10.)

6. Elevation arcs (pl. 21). An arc-shaped rack is dowelled and secured with cap screws to the top of each side plate of the slide (pl. 20). As these arcs move with the slide when the gun is elevated or depressed, the sight is moved an identical angle. Turning the sight angle handwheel, however, forces the sight angle pinions to travel on the elevation arcs, and thus changes the sight angle.

7. Sight detent. A spring-loading plunger in the left counterweight bracket (pl. 21) engages in a cutaway segment of the trunnion clip (fig. 12, ch. 4). This plunger prevents a sight angle greater than 8° (approx.) being set unless it is manually withdrawn by the sight setter. A warning plate attached to the counterweight bracket reads:

 

CAUTION
TO AVOID MOUNT HAND-.
WHEEL INTERFERENCE
Do NOT DEPRESS SIGHT
BEYOND STOP WHEN
GUN IS DEPRESSED
10 DEGREES
(MAX. DEPRESSION)
POSITION SIGHT AT
0 DEGREES SIGHT ANGLE
WHEN NOT IN USE

This detent serves as a warning to the sight setter only. After the detent has been pulled out of engagement and sight angle set, the pointer may depress the gun so that the sight optics hit the hand-wheel brackets. Also, after the detent has been pulled clear, the sight setter can depress the optics into the handwheel brackets when the gun is not depressed.

8. Drum assembly (pl. 21, fig. 22 and fig. 27). The deflection and sight angle drums are enclosed in a drum cover, which is secured to a machined surface on the top of the left hand sight bracket. The deflection drum is graduated in mils, with the graduations numbered from 290 to 710; the 500 mark represents zero deflection. It is mounted on a support disc with cap screws and a Clamping disc. The support has lugs which lock it radially on the splined deflection pinion shaft so that it turns with that shaft. The sight angle drum shaft projects through the deflection pinion shaft to support the sight angle drum above the deflection drum. The sight angle drum is graduated from 0 to 14,500 (yds.) around the top, and from 2000 to 4400 minutes of arc around the bottom. Two vertically arranged rectangular openings in the back of the drum cover carry the legends RANGE YARDS, SIGHT ANGLE MINUTES, and DEFLECTION MILS, as shown on plate 21. Scribe marks are provided in the edges of the openings against which range, sight angle, and deflection are read. An access plate is provided on the top of the drum.

9. Telescope Mark 39.* The Mark 39 series telescopes are of the straight-body, monocular, single-power, fixed-focus type, without checker's eyepieces. They are watertight and of rugged construction, designed to withstand the hard usage and high underwater pressure incident to a submarine service.


* See O. P. 481 for detailed description.
 

60
 

Fig. 21-Telescope, Mark 91-General Arrangement
Fig. 21-Telescope, Mark 91-General Arrangement

 

61
 
Each telescope is fitted with a valve for charging the interior with dry air or nitrogen, and is equipped with an internal color filter. The telescopes are mounted in Mark 29 holders, which fit in the cylindrical clamps of the telescope support brackets.

Magnification 5X
True field 10°
Exit pupil 5.0 mm
Eye distance 32mm
Eyepiece, fixed focus, set at minus, 1.5 diopters
  checker's eyepieces. The telescope is illustrated in figure 21. Data are as follows:

Magnification 6X
True field
Exit pupil 8.3mm
Eye distance 23.0mm

As indicated in paragraph 2, Telescope Mark 91 will be installed on all the subject mounts. Support for the telescope will consist of a bracket secured to the deflection arc shaft. The telescope will be mounted in this support bracket with adjustment

Fig. 22-Sight Angle and Deflection Drums-Graduations
Fig. 22-Sight Angle and Deflection Drums-Graduations

10. Telescope Mark 91. This telescope differs from most other broadside gunsight telescopes in that it is binocular. It is of the straight body, prismatic, single-power, fixed-focus type without   device provided for adjusting line of sight in elevation. A lamp in the telescope will be energized by a wet type storage battery. A switch will be provided to control this lighting circuit.
 

62
 

Fig. 23-Sight Mark 42-Open Sights
Fig. 23-Sight Mark 42-Open Sights

Telescope Mark 91 will be mounted so as to be easily removable. The purpose is to enable rapid substitution of a standard 7 x 50 binocular (carried by both trainer and pointer) in case the Mark 91 telescope is fouled by foreign matter when submerged. When thus mounted, the lines of sight of the standard binocular will be parallel to those of the telescope.

11. Open sights. The open sight assembly for the Mark 39 telescopes (fig. 23) comprises a support bracket which clamps on the telescope holder. a sight bar pinned in the support bracket, and front and rear sights mounted on the sight bar. The long vertical slit in the trainer's front sight enables the trainer to keep on the target when the pointer is off in elevation. The long horizontal slit in the pointer's front sight permits the pointer to keep the target continuously in sight when the trainer is off. The pointer must have the slits in the front and rear sights aligned on the target, and the pyramidal lug on the front sight centered in the notch of the rear

  sight and on the target, to have the gun aimed properly for firing.

OPERATION

12. The sight is operated by rotating the sight angle and deflection handwheels in response to range and deflection orders. Such motion offsets the lines of sight in elevation and azimuth from parallelism with the gun axis. When setting sights. the final setting should always be made by turning the handwheel in the same direction (e.g., from high to low, or from left to right) to minimize the effect of lost motion. When the deflection handwheel is turned to the right, its worm turns the deflection wormwheels to the left. The wormwheel shafts, mounted in the right hand and left hand sight brackets, turn the deflection arms through the wormwheel shaft pinions so as to move the line of sight of each optic an equal amount to the left. At the same time, the left wormwheel shaft turns the deflection drum to increase the scale reading. When the sight angle handwheel is turned to the right,

 

62a
 

Plate 21, 5-Inch Sight Mark 42, General Arrangement (Large drawing on separate page.)

 

63
 
the worm on the handwheel shaft turns the sight angle shaft through its wormwheel. The pinions on the sight angle shaft, which engage the elevation arcs on the slide, rotate the entire sight assembly about its trunnion clip pivot by moving forward on the elevation arc racks. The sight is thus depressed relative to the line of fire. At the same time, the spiral gear on the left end of the sight angle shaft, which engages a similar gear on the sight angle drum shaft, increases the sight angle reading of the drum.

MAINTENANCE AND OPERATING INSTRUCTIONS

13. The sight is to be maintained, operated, lubricated, and exercised in accordance with the regulations of the Ordnance Manual and the lubrication instructions of chapter 10 of this pamphlet. Extreme care must be taken not to damage the sight optics when setting sight angle, or when depressing the gun when sight angle has been previously set. The detent arrangement in the left counterweight bracket will not prevent the optics from being depressed into the elevating and training gear hand-wheel brackets. Interference will occur with the gun at 0° elevation and the sight angle set at 28° or more.

ADJUSTMENTS

Bore Sighting and Sight Alignment

14. General instructions--sight alignment. The assembled sight requires periodic check on shipboard with subsequent adjustment to correct lost motion and alignment errors when such errors are discovered. Accuracy tests and sight adjustments as described in the paragraphs following are the same for the Sight Mark 42 and Sight Mark 42 Mod. 2. Accuracy tests are to be performed as soon as practicable after firing and at sufficiently regular intervals thereafter to ensure that the sights will be accurate when required for gun laying and firing.

15. Bore sighting. Testing of alignment of the lines of sight for parallelism with the gun bore, or any desired convergence with the bore axis, is accomplished by bore sighting. The procedure is similar to that described in Ordnance Pamphlet No. 762, Alignment of Ordnance Installations, chapter 2. The theory and principles defined in that text are applied in alignment of 5-inch Mount Mark 40

  sight assemblies as described in paragraphs 18 and 19; the operations employ equipment described in paragraph 16 and use any convenient target such as the horizon, a star, or a specially prepared screen or batten.

16. Bore sight equipment. The accessories designed and provided for sight alignment are the units illustrated in chapter 9, figures 28 and 29. These devices are used as described in the subparagraphs following. The assembly is designated Bore Sight Mark 25.

(a) Muzzle disc. The disc unit illustrated in figure 28 is a bore sight telescope alignment element provided in order to facilitate placing the telescope line of sight in coincidence with the gun bore axis. The disc has well defined circumferential lines 1/8 inch apart on its outer tapered surface. Centering the disc in the muzzle by means of these lines places a 1/16-inch hole in the center of the disc face exactly in coincidence with the bore axis.

(b) Telescope holder. The telescope holder unit is a bar-type support for the telescope transversely bolted across the rear face of the gun housing in the arrangement illustrated in figure 29. It accurately centers the telescope bearing in the bore axis extended.

(c) Bore Sight Telescope Mark 75. The telescope unit is a standard optical design mounting in the holder as shown in figure 29. When seated the instrument line of sight is adjusted to center on the hole in the muzzle disc by means of the sleeve type rear bearing and four adjusting screws.

17. Preparations for bore sighting. Preliminary to bore sighting perform the following:

(a) Examine the telescopes to see that they are clean, properly focused, free from parallax, and that the crosslines are clearly visible and in correct positions.

(b) Run the sight through full arc of elevation and deflection movements to verify that the mechanism works freely and is properly lubricated. In performing this operation observe precautions as to interference between sight - optics and handwheel brackets.

(c) Place the gun at 0° elevation and drop the breechblock. Mount the bore sight telescope holder on the rear face of the housing and secure the bore sight telescope in the holder.

 

64
 
(d) Insert the muzzle disc in the muzzle of the gun, tapping lightly to match the circumferential lines with the front face of the muzzle.

(e) By means of the bore sight telescope adjustment screws, center the telescope crossline on the center hole in the muzzle disc.

(f) Remove the muzzle disc and focus the telescope on the target verifying that there is no parallax.

18. Sight alignment, bore sight procedure. Man the mount sight and bore sight stations. Set the mount telescope sights at 500 mil deflection. Set sight angle at 2000 minutes. (Both settings are zero index readings on the respective drum scales.) Lay the gun to position the bore sight on the target. Pointer and trainer check as to whether their respective telescope lines of sight are on the target. If the ship is at sea and the horizon is used as a target, pointer and trainer check on the target as the man at the bore sight calls "mark." If the ship is moored and a star or a distant jack staff is used the procedure is similar. Any alignment error should be corrected at the respective telescope holder bearing, bringing each line of sight parallel to the bore without changing the sight zero settings; repeat the alignment check until alignment is obtained. After the adjustment, again repeat the check calling "mark" alternately at pointer's and trainer's stations and verifying at other stations. Alignment check, using the horizon as a target, serves to check the line of sight in elevation only. After completing this stage of bore sighting, reinsert the muzzle disc and verify the bore sight line-of-sight position. Without moving the telescope positions as aligned, check the 500 mil deflection scale reading and the 2000 minute sight angle scale reading. If either reading is off, unclamp, slip the drum to correct position and reclamp. Shake the telescopes and holders for looseness, tighten and recheck the alignment and the vertical and horizontal positions of cross wires. Run sights up and down, right and left and again check cross wires. The preceding relatively simply waterborne alignment check and verification of drum scale readings should be supplemented by precise check of line-of-sight movement whenever the ship is drydocked. This test of the sight assembly is performed as described in the paragraph following.

19. Sight movement check, bore sight procedure.

  When drydocked, verification of the precision of the sight movements with respect to the bore is made by using as a target a specially prepared batten having vertical and horizontal lines or wires for each line of sight and the bore sight, spaced as indicated in the line-of-sight data of figure 1. A batten, required for the alignment check procedure described below, must be of such size as to permit trace of lines of sight through full deflection, movement right and left and at least 30° elevation movement when placed at a distance of at least 50 feet from the mount center of rotation. It must be provided with small targets for pointer's and trainer's lines of sight located at 0° deflection and elevation position of each line of sight extended. These targets should carry scale calibrations arranged at intervals equivalent to subtended angles of error of one, two, three, and four minutes of error above, below, right and left of the target center. Targets and wires are located and secured on the batten at a later stage of the set-up, as described below. In preparation for the check the batten must be carefully emplaced to position the vertical plane of the batten perpendicular to the plane of the gun mount roller path and normal to 0° elevation bore sight line of sight; the roller path should be horizontal, but tilt may be compensated by batten position or position of wire traces. It is desirable that the mount be at 0° train and that the batten be aligned with ship's centerline.

The sight movement alignment check proceeds as follows: Set up bore sight assembly. Level the gun with gunner's quadrant. Locate bore sight trace on the batten, training mount right and left. Return the mount to 0° train position. Plot and locate pointer and trainer targets and vertical and horizontal wires on the batten, for both open and telescopic lines of sight. Set the sights for 2000 minutes elevation and 500 mil deflection. Take sight readings on the target; adjust the respective lines of sight if necessary to center each on its target. Run the sight through full arc of deflection to both sides; the crosslines must follow the horizontal lines. Return to 0° targets. Elevate the gun; the lines of sight and the bore sight must follow their respective wires. With the gun elevated depress the lines of sight; each must follow its respective wire. In addition to this test of line-of-sight
 

65
 

Fig. 24-Right Hand Bracket
Fig. 24-Right Hand Bracket

 

66
 
movements, verify the mechanical accuracy of drum scale readings and the extent of lost motion as described below.

20. Test for mechanical accuracy. The sight movements are designed to be mechanically accurate as to calibrated readings with included error not greater than one minute of arc in either the sight angle or deflection movements. When the sight was initially erected, tested, and accepted, the arcs of movement and the calibrations were proven by checking at 120 minute intervals throughout the range of all movements. The accuracy of calibrations accordingly can be assumed to be correct and therefore a step-by-step verification of scale readings against equivalent line-of-sight movements is not essential. It is sufficient to ascertain the existing overall error within the full range (or major portion) of each line-of-sight movement. Such overall error will be an accepted error of one minute plus error due to casualty, wear, or both. The test procedure to reveal the error is as follows:

(a) Sight angle movement. Position the gun and sight crosslines on their respective 0° targets. Verify that the sight angle drum reads 2000 minutes. Elevate the gun to bore sight on the upper limit of the batten (28° minimum is required to ensure that no interference between the telescope and mount hand-wheels will occur during the test). Install a target on the batten at the elevated line-of-sight position. With transit, or quadrant mounted on the sight measure the angle subtended between the upper and lower targets. Operate the sight angle movement to drum scale reading equal to the computed angle, being careful not to pass the desired scale reading. Observe the error at the lower target.

(b) Deflection movement. Mechanical accuracy test for the deflection movement is similar to the sight angle test. Supplementary targets are required on the batten right and left of the 500 mil target, gun at 0° elevation 0° train. The targets must be located accurately at the extreme deflection positions indicated in figure 1. Operating the sight deflection movement, sight the telescopes on the extreme left target. Operate the movement back to 500 mil scale reading, being careful not to pass that graduation. Observe the line-of-sight error at the center target. Repeat the test from the extreme right target toward the center target.

21. Observed errors and correction instructions.

  Sight alignment errors and mechanical inaccuracies ascertained by the preceding described procedure should be recorded; excessive errors are only to be corrected as indicated in the following. Errors of alignment that cannot be compensated or corrected at the telescope holders or sight bracket adjustments, inaccuracies of drum scale readings that cannot be corrected by slipping and resetting the drums, and any excessive lost motion errors, are to be corrected by refitting or replacement of parts, or both. Refitting and replacement of parts may be performed only by repair ship or home yard personnel experienced in such work.

22. Sight angle movement adjustable coupling. The adjustable coupling on the transverse sight angle shaft is a design provision to facilitate manufacture and erection. It provides a means for obtaining synchronized mesh of the two shaft pinions with the respective sight elevation arcs. It is not an alignment adjustment. The position established at erection should not be altered.

23. Deflection movement adjustable coupling. The adjustable coupling on the transverse deflection shaft is an adjustment provision to enable aligning the trainer's telescope support bracket parallel to the pointer's telescope line of sight. The adjustment is accessible at an opening in the bottom of the cross tube. In the Mark 42 design it provides a means for making coarse adjustment, fine adjustment being obtained at the telescope holder adjustment. In the Mark 42 Mod. 2 design all of the alignment adjustment must be made at the coupling.

24. Telescope alignment adjustment Sight Mark 42 Mod. 2. The modified sight design will have special provision for aligning each telescope line of sight in elevation. The arrangement is an adjusting device permitting pivoted adjustment of the telescope. The adjustment enables functional alignment of Telescope Mark 91 similar to the rear bearing alignment adjustment provided in the telescope holder of the Mark 42 design for Telescope Mark 39.

25. Sight angle and deflection drum adjustments. The sight angle and deflection drums have clamped assembly on their respective shaft drives. Access and method of unclamping and adjusting each drum is apparent from the exploded view of the subassembly, figure 27, and the design drawings.

 

67
 

Fig. 25-Left Hand Bracket
Fig. 25-Left Hand Bracket

 

68
 

DISASSEMBLY AND ASSEMBLY

26. Disassembly of the sight is accomplished as follows:

(a) Remove the sight optics from the telescope support brackets.

(b) Disconnect drive brackets 253416-4 from the telescope support brackets and from the deflection arcs. Withdraw shafts 253416-3 from the right hand and left hand brackets and remove the telescope support brackets.

(c) Disassemble the deflection shaft couplings and deflection shaft 253419-1 from the deflection worm shafts 253419-3 and -5.

  (d) Remove worm shaft 253419-5 (fig. 24) from the right hand bracket and take worm 253418-2 out through the rear opening in the bracket.

(e) Withdraw taper pin 253421-4 from collar 253419-7 (fig. 25) and slide the collar off worm shaft 253419-3.

(f) Pull shaft 253419-3 out of the left bracket in the direction of the handwheel. (It may be necessary to tap the end of the shaft lightly with a leather maul to free worm 253418-2 from the shaft splines.)

(g) Remove worm 253418-2 through the rear opening in the bracket.

Fig. 26-Cross Tube
Fig. 26-Cross Tube

 

69
 
(h) Remove locknut 253424-9 from the bottom of sight angle drum shaft 253422-5 and locknut 253424-10 from sight angle shaft 253420-4. Remove gears 253422-1 and 253422-3 from these shafts.

(i) Remove deflection and sight angle drum cover 253579-1.

(j) Lift sight angle drum 253425-1, with shaft 253422-5, clear of the assembly.

(k) Remove locknut 253424-12 and deflection drum 253425-2 from shaft 253420-3.

(l) Remove machine screws 12-Z-43-30 and wormwheel retainer 253423-3.

(m) Withdraw wormwheel shaft 253420-3 and wormwheel 253418-1.

(n) Take deflection arc 253416-2 out of the bracket.

(o) Withdraw sight angle worm shaft 253421-1 by removing taper pin 253421-4 and collar 253421-2.

(p) Remove worm 253418-2.

(q) Remove locknut 253424-11 from shaft 253420-4.

(r) Disassemble sight angle shaft couplings through the openings in the cross tube and drop shaft 253418-6 to the bottom of the tube.

(s) Remove cover plate 253423-1 from the right hand bracket (fig. 24) and disassemble wormwheel 253418-1, shaft 253420-1, and deflection arc 253416-1.

(t) Disassemble cross tube, right hand and left hand brackets and counterweight brackets and remove from the mount. All remaining pieces are readily disassembled.

17. Reassembly of the sight is performed in the reverse order of the steps given for disassembly.

 

Fig. 27-Sight Angle and Deflection Drums
Fig. 27-Sight Angle and Deflection Drums

 

70
 
This page is blank.
 

71
 
Chapter 9
ACCESSORY EQUIPMENT AND SPECIAL TOOLS
 

GENERAL DESCRIPTION

1. This chapter is a summary of the accessory equipment and special tools furnished for the mount. All accessories are illustrated on plate 22 and figures 28, 29, and 30. All tools are illustrated on plate 23 and figure 31. Instructions for use where not apparent are provided in this chapter. Where use has been previously described, reference

  is made to such instructions as are given in the preceding text. All accessories and tools must be used only for the purpose for which designed and must be cleaned before returning to storage.

2. The complete list of accessories and tools furnished for each mount. Subassembly is as in the following listings:

(a) Gun assembly
NAME DRAWING NUMBER REMARKS
Bore plug gauge Sk. 85108 See par. 3
Bore lapping head Sk. 7413 See par. 4
Bristle sponge and cap 8-Z-1245; 8-Z-831 See par. 5
Sectional handle 8-Z-825 See par. 6
Cartridge case extractor 256032 See par. 7
Breechblock dismounting tool 8-Z-911-13 See par. 8
Compressor bar assembly 8-Z-937, 1, 2, 3, 4 See par. 8
Cam tool assembly 8-Z-939-6, 7, 8; 8-Z-937-12 See par. 8
Plunger spring compressor 8-Z-939-9 See par. 8
Breechblock support 8-Z-956-1 See par. 8
Extractor support 8-Z-956-2 See par. 8
Cocking tool 8-Z-925-4 See par. 8
Socket wrench 12-Z-700-0163 See par. 8
(b) Slide
Spring compressor 57627-4, 13, 40, 41; 8-Z-1117-10 See par. 10
Engineers wrench 8-Z-917-5
Screwdriver 12-Z-705-5
Socket wrench 12-Z-720-21
Engineers wrenches 12-Z-721, 1, 2, 10, 14, 17, 20, 43
Cap screw wrenches 12-Z-723-14, 15
(c) Elevating gear
Screwdriver blades and stock 8-Z-909-3, 4, 7, 8
Socket wrench 8-Z-943, 3, 22
Engineers wrenches 12-Z-721, 6, 9
(d) Sight
Bore Sight Mark 25 and box Sk. 12171 See par. 11
Bore Sight Telescope Mark 75 Sk. 62682 See par. 11
Box for Bore Sight Telescope 236090
Drift pin 8-Z-915-6 For disassembling
taper pins.
 

72
 
NAME DRAWING NUMBER REMARKS
Screwdrivers 12-Z-705-3, 4
Engineers wrenches 12-Z-721-5,12-22
Cap screw wrenches 12-Z-723-3, 4, 7
Bent nose pliers 12-Z-728-26
(e) Miscellaneous
Cartridge tank wrench 147585-1 For Cartridge Tanks Mark 3 and Mark 8.
Filling funnel 8-Z-801-1,2,10 For filling recoil cylinder.
Hydraulic grease gun 12-Z-339-1 For general lubrication.
Fuze setting wrench 245748-4 For second Fuzes Mark 18 Mods. 2 and 3.

Fig. 28 - 5-inch Bore Sight Mark 25
Muzzle End Arrangement
Fig. 28-5-inch Bore Sight Mark 25 Muzzle End Arrangement

 

73
 

PLATE 22, 5-Inch Mount, Mark 40 - Accessory Equipment
PLATE 22

 

74
 

PLATE 23, 5-Inch Mount, Mark 40 - Special and Commercial Tools
PLATE 23

 

75
 

Fig. 29-5-inch Bore Sight Mark 25
Breech End Arrangement
Fig. 29-5-inch Bore Sight Mark 25 Breech End Arrangement

Bore Plug Gauge

3. The bore plug gauge must be passed through the gun after firing. (See par. 33, ch. 2.) To do this it must be attached to the sectional handle, par. 6): The gauge is illustrated on plate 22.

Bore and Rifling Groove Lapping Head

4. The lapping head which is used for lapping of the bore or the rifling grooves is illustrated on plate 22. Instructions for use are prescribed in

  paragraph 33, chapter 2. Mount the follower block on the sectional handle (par. 6) near the locking ring, and attach the lapping head to the end of the sectional handle. To insert the head in the gun, hold the lead lapping segments depressed by means of the locking screws. After inserting the head, loosen the screws. On plate 22 the lead segments shown mounted on the lapping head are used for lapping the rifling lands. Lead segments for lapping the rifling groove will be molded on board ship and
 

76
 

Fig. 30-Cartridge Case Hand Extractor Plan View Showing Method of Attachment
Fig. 30-Cartridge Case Hand Extractor Plan View Showing Method of Attachment

Fig. 31-Method of Attachment of Spring Compressor
Fig. 31-Method of Attachment of Spring Compressor

 

77
 
attached to the four wooden blocks shown on plate 22. When using the lapping head, attach either rifling groove or bore laps, not both.

Bristle Sponge

5. Instructions for use of the bristle sponge are given in paragraph 33, chapter 2. It is illustrated on plate 22. The sponge must be attached to the sectional handle to pass it through the bore. When the sponge is not in use it must be covered with the canvas cap which is provided for the purpose.

Sectional Handle

6. Two sectional handles (pl. 22) are furnished to enable passing the bore plug gauge, the bore and rifling groove lapping head, and the bristle sponge through the gun barrel. The coupling handle on each of the forementioned accessories may be attached to the sectional handle by pushing the coupling handle into the right end (pl. 22) of the sectional handle and apply a slight right-hand twist. To uncouple, depress the locking ring of the sectional handle and apply a left-hand twist. The two sectional handles may be attached to each other by inserting the rear end of one into the forward end of the other in the manner described above. Each has an effective length of six feet.

Cartridge Case Hand Extractor

7. The cartridge case hand extractor is a device used for removing a case which has seized in the gun chamber and cannot be removed by ordinary means. The method of attachment is illustrated in figure 30. As the case comes loose, additional wood blocks may be placed under the tip of the hand extractor in order to retain leverage. The lower end of the hand extractor is shaped to fit the rim of the cartridge case. Therefore before setting up the device as shown in figure 30 an attempt should

  be made to pry the case loose by means of the hand extractor lever alone.

Housing Assembling Tools

8. The tools used in assembly and disassembly of the housing breech mechanism are the dismounting tool, the compressor bar assembly, the cam tool assembly, the plunger spring compressor, the breechblock support, and the extractor support. All of these tools are shown on plate 23. Instructions for their use are given in paragraphs 40 and 41 of chapter 2. Use of the compressor bar assembly, the cam tool assembly, the plunger spring compressor, and the extractor support is illustrated on plates 10 and 11.

Cocking Tool

9. The cocking tool is shown on plate 23. It is used for manual recocking of the firing pin mechanism. To accomplish this it is necessary to place the cocking tool grab hooks over the firing pin cocking handle and to then pull backward.

Spring Compressor

10. The spring compressor is used to disassemble the counterrecoil mechanism. The method of attachment is illustrated in figure 31. The step by step procedure for disassembly is prescribed in paragraph 26 of chapter 2.

Bore Sight

11. Use of the bore sight is fully described in the adjustment instructions of chapter 8. Muzzle end arrangement is illustrated in figure 28; breech end arrangement is illustrated in figure 29. When the bore sight is not in use it must be stored in a special box which is provided for the purpose. The bore sight telescope is stored in a separate box.

 

78
 
This page is blank.
 

79
 
Chapter 10
LUBRICATION INSTRUCTIONS
 
1. Foreword. War conditions have imposed new problems as to lubrication maintenance of Ordnance equipment. The necessities of constant readiness and of operating the mounts daily through long periods together with the extremes of weather encountered in present operations has required new lubricants and frequent change of lubricants. No standard oils or greases have been available that are universally adaptable to all conditions. Extensive research to develop better lubricants and appropriate servicing instructions is in process. Accordingly, lubricating instructions as at present compiled on the appended charts are subject to change.

Mount Lubrication Facilities

2. All elements of all assemblies have design arrangements for initial packing or for replenishing lubricants. Wherever practical, the designs provide for retaining the lubricants, provided the prescribed oil or grease or a permitted substitute is used. The locations of all grease fittings, oilers, access covers, cover plates, filling plugs, and other points for applying lubricants are indicated on the lubrication charts. Precautions as to lubrication for many of the preceding indicated arrangements are prescribed under the "MAINTENANCE INSTRUCTIONS" of the preceding chapters. These should be observed in addition to the instructions of the lubrication charts and the references below.

Prescribed Lubricants and Alternatives

3. The oils, greases, and special lubricating compounds prescribed by the lubrication charts for

  5-inch Mounts Mark 40 are given in the list below. This tabulation includes substitutes which may be used when prescribed lubricants are not available. The prescribed lubricants include selections adapted to varying extremes of temperature. Substitution of others should not be made for any lubricant which does not specify an alternative. Substitute lubricants must be replaced as soon as practical by the preferred lubricant. Lubricants changed to meet changing extremes of weather must be replaced with the correct lubricant when normal climatic conditions next occur.

4. Breechblock lubricant, O. S. 1165. The special breechblock lubricant originally compounded of castor oil, gun slushing compound, and ice machine oil, was proved to be of too heavy consistency for extremely cold weather operation. The specification for this lubricant has been revised (0. S. 1165, Rev. B) to specify different ratios of castor oil and mineral oil, Navy Symbol 2135, for summer and winter use.

5. Dilution of lubricants with kerosene. Lubricants should not be diluted with kerosene in order to facilitate cold weather operation. It has been found that injections of kerosene will not alleviate the difficulty experienced in extremely cold weather when the preferred lubricants congeal. Follow the instructions on the appended lubrication charts for cold weather remedy.

6. Ordnance Data Number 3000. Definitions, comparative data, and general instructions as to use of the above listed oils, greases, and compounds are contained in Ordnance Data Number 3000, "Lubrication of Ordnance Material." As a reference

LUBRICANT SYMBOL ALTERNATIVE SYMBOL
Extra light mineral oil 1042 2110, 2075
Slush-on lubricant O. S. 1385 5190
Bearing grease O. S. 1350 1042, 2110, 2075, 14-G-1 (Gr. 1)
Breechblock lubricant O. S. 1165
Rust preventive 52-C-18 (Gr. 1)
Gun slide lubricant O. S. 1384
 

80
 
manual of general instructions, this pamphlet is to be used for lubrication maintenance of the mount assemblies with specific exceptions as indicated above and on the lubrication charts. The limiting characteristics of substitute lubricants as itemized in O. D. 3000* are particularly stressed.

7. Adulterants; mechanical sabotage of petroleum products. The number of soluble, corrosive, gumming, and generally harmful agents which may be added to lubricating oils and compounds is almost limitless. In instances of the suspected presence of solid insoluble abrasives, such as emery, carborundum, silica, pumice, etc., the detection may be made by diluting a drain sample of the oil with several volumes of gasoline and filtering the mixture through chamois. Adulterants of this class may be similarly detected in greases by mixing a sample with gasoline until a filterable solution is obtained. Detection of soluble adulterants in petroleum products requires test that can be performed only by personnel with appropriate testing equipment. If the purity of the lubricant is doubted do not use it. Operate the mounts without lubricant or with approved substitute of known purity.

Lubricating Frequency

8. All lubrication charts for these assemblies prescribe the lubricating schedules in terms of "daily," "weekly," and "monthly" together with alternative


* This Ordnance data will be superseded at a later date by an Ordnance pamphlet covering the same subject.
  frequency measured in "hours of operation." Under war conditions of long periods of daily operation to keep the mounts in readiness for action, the "hours of operation" is the criterion as to lubrication frequency.

9. In addition to the frequencies prescribed, certain elements require replacement of lubricant or preservative film immediately after firing. This applies particularly to all parts of the breech assembly, the bore, and housing guides. Other parts should be checked as to adequacy of lubricant before operating. This applies to the breechblock ways.

10. Quantities. All parts lubricated should be exercised after lubricating with exception of parts which are lubricated after firing. Certain elements of the mount assembly must receive sparing application of lubricant. Lubrication of firing pin units must never be excessive; all parts of the breech assembly, breechblock ways excepted, should be wiped free of excessive lubricant before firing. Malfunction or casualty may develop if the lubricant requirements of the respective elements indicated are exceeded.

Lubrication Charts

11. Detailed lubrication instructions for all elements of all Ordnance assemblies comprising the gun mount designs described in this book are given on the lubrication charts, drawing 253589 and 253590. Copies of these drawings are appended.

 

81
 
SAFETY PRECAUTIONS
 
Preparing the Mount for Operation

1. Release the deck clamp from the gun muzzle.

2. Inspect the breech mechanism to see that it is free of foreign matter. Install firing pin. Lower the block manually.

3. Inspect the gun bore to see that it is free of foreign matter and drained of water.

4. Check lubrication of breech mechanism.

5. Check operation of breech mechanism, firing mechanism and trigger safety latch. See chapter 2, paragraph 31 and chapter 3, paragraph 24.

6. Check lubrication of guide rails.

7. Check that sight optics are clean. If time for cleaning is not available, substitute standby binocular (furnished for Sight Mark 42 Mod. 2).

8. Check entire mount for presence of foreign matter.

9. Operate training gear, elevating gear and sight, checking for mechanical bind.

Operating Instructions

10. Verify that the trigger safety latch is engaged before loading the first round.

11. If breechblock jams, fails to latch open, or operation is stiff, follow instructions of chapter 2, paragraph 29.

12. If a cartridge case seizes in the gun chamber, use cartridge case extractor as described in chapter 9, paragraph 7.

  13. If the gun misfires, follow instructions of Bureau of Ordnance Manual.

14. Loader must operate trigger safety latch immediately after loading each round, first stepping out of way of recoiling parts. Loader should observe that latch is engaged before loading each round.

15. Pointer and sight setter must take care that they do not cause the sight to be depressed so far as to result in interference of pointer and trainer handwheel rotation by the sight optics.

16. Sight setter must operate sight detent whenever sight angle is varying in the neighborhood of eight degrees.

Stowing the Mount

17. Perform maintenance care of gun barrel described in chapter 2, paragraph 33.

18. Perform bore sighting check described in chapter 8 (ADJUSTMENTS). Check line of sight of open sights and (for Sight Mark 42 Mod. 2) standby binoculars.

19. Perform the necessary mount lubrication.

20. Clean telescope windows and fasten covers securely over windows.

21. Remove standby binoculars (Sight Mark 42 Mod. 2 only).

22. Remove and clean firing pin assembly. Stow below.

23. Set sights at zero elevation and deflection.

24. Fasten deck clamp over gun muzzle, making certain that clamp is firmly secured.

 

82
 

drawing of gun with calouts of lubrication points, Drawing number 253589

 

83
 

WEEKLY OR 30 HOURS OPERATION (Minimum)

1 BREECHBLOCK GUIDES (CLEAN THOROUGHLY BEFORE LUBRICATING) HOUSING
2 ELEVATING PINION SHAFTS (2 FITTINGS) SIGHT
3 DEFLECTION WORM & WORMWHEEL, RIGHT (COAT) SIGHT
4 DEFLECTION WORN SHAFT RIGHT SIGHT
6 DEFLECTION ARC. RIGHT (COAT TEETH) SIGHT
6 TRUNNION BEARINGS CARRIAGE
7 INPUT SHAFT, TRAINING INTERMEDIATE BRACKET TR. GEAR
8 OUTPUT SHAFT, TRAINING INTERMEDIATE BRACKET TR. GEAR
9 ELEVATION ARCS (COAT TEETH) SIGHT
10 DEFLECTION PINION SHAFT, RIGHT SIGHT
11 TELESCOPE HOLDER PIVOT SHAFT. RIGHT SIGHT
12 ELEVATING PINION SHAFT. RIGHT SIGHT
13 COUNTERWEIGHT BEARING. RIGHT SIGHT
14 TRAINING INTERMEDIATE BRACKET BEVEL GEARS COAT TA. GEAR
15 TRAINING HANDWHEEL BRACKET BEVEL GEARS COAT TR. GEAR
16 ROLLER PATH COAT THROUGH ACCESS COVERS WHILE TRAINING STAND
17 TRAINING CIRCLE COAT THROUGH ACCESS COVERS WHILE TRAINING STAND
18 HYDRAULIC CYLINDER PUSH ROD, FIRING MECH. CARRIAGE
20 DEFLECTION PINION SHAFT, LEFT SIGHT
21 DEFLECTION WORM A WORMWHEEL, LEFT (COAT) SIGHT
22 DEFLECTION WORN SHAFT. LEFT SIGHT
23 DEFLECTION ARC. LEFT (COAT TEETH) SIGHT
28 HANDWHEEL HANDLES EL. A TR. GEAR
26 SIGHT ANGLE DRUM SHAFT (ORE FITTING INSIDE) SIGHT
20 ELEVATING PINION SHAFT, LEFT SIGHT
27 TELESCOPE HOLDER PIVOT SHAFT, LEFT SIGHT
28 COUNTERWEIGHT BEARING, LEFT SIGHT
29 UPPER BRACKET. TRAINING& DEPRESSION STOP CARRIAGE
30 ELEVATING ARC & PINION (COAT) SLIDE
31 ELEVATING PINION SHAFT EL. GEAR
32 LOWER BRACKET, TRAINING & DEPRESSION STOP CARRIAGE
33 FIRING PEDAL PLUNGER EL. GEAR
38 FIRING PEDAL EL. GEAR
MONTHLY OR 120 HOURS OPERATION (MINIMUM)
19 GUN SECURING THREADS HOUSING
 
253589

GENERAL LUBRICATION INSTRUCTION - REFER TO O.D. 3000.

APPLICATION. - EXERCISE PARTS WHILE LUBRICATING.

REPORTS. - SHIPS EXPERIENCING ANY DIFFICULTY WITH THE OPERATION OF THE EQUIPMENT DUE TO LUBRICATION IN ACCORDANCE WITH THIS CHART SHOULD SUBMIT A DETAILED REPORT TO THE BUREAU OF ORDNANCE WITH COPY TO THE NAVAL GUN FACTORY.

CHECK OFF LISTS. - REDUCED SIZE PHOTOPRINT COPIES OF THESE CHARTS MAY BE OBTAINED FROM THE NAVAL GUN FACTORY FOR USE AS PERIODIC CHECK-OFF LISTS.

REFERENCE CHARTS. - FOR LUBRICATION OF RIGHT AND LEFT SIDES. SEE DR. NO. 253590.

AFTER SUBMERGENCE. - THE MOUNT SHOULD BE CAREFULLY INSPECTED FOR CORROSION. RESTORED TO A SATISFACTORY OPERATING CONDITION, AND LUBRICATED IN ACCORDANCE WITH THE CHART.

SUBSTITUTIONS:

UNTIL O.S. 1385 BECOMES AVAILABLE. SUBSTITUTE NAVY SYMBOL 5190.

UNTIL O.S. 1350 BECOMES AVAILABLE. USE THE FOLLOWING SUBSTITUTES:
EXTRA LIGHT MINERAL OIL (NAVY SYMBOL 1042, 2110 OR 2075)* AT POINTS 18, 33, 34.
MINERAL LUBRICATING GREASE (H.D.S 14-G-1, GR. 1) AT ALL OTHER POINTS WHERE O.S. 1350 IS SPECIFIED.

NOTE:-

SHIPS SHOULD MAKE EVERT EFFORT TO OBTAIN SUPPLIES OF THE SPECIFIED LUBRICANTS. SUBSTITUTES LIMIT SATISFACTORY OPERATION.

IMPORTANT- COLD WEATHER REMEDY
(FOR SUBSTITUTE LUBRICANTS ONLY)

MINERAL LUBRICATING GREASE (M.D.S. 14-G-1, GR. I) AND NAVY SYMBOL 5190 ARE INTENDED FOR USE IN TEMPERATURES ABOVE 30° F. FOR LOWER TEMPERATURES. EXTRA LIGHT MINERAL OIL (NARY SYMBOL 1042, 2110 OR 2075)* MUST BE SUBSTITUTED. TO DO THIS, REMOVE THE GREASE FITTINGS, INJECT KEROSENE. REMOVE ALL COVER PLATES. WIPE ACCESSIBLE WORKING PARTS CLEAN WITH LINT-FREE. KEROSENE-SOAKED CLOTH. WIPE DRY AND LUBRICATE FREELY WITH EXTRA LIMIT MINERAL OIL. INSPECT REGULARLY FOR CORROSION AND LUBRICATE FREQUENTLY WITH EXTRA LIGHT MINERAL OIL TO INSURE CONTINUAL PROTECTIVE OIL FILM ON PARTS THUS TREATED. UPON RETURN TO TEMPERATURES ABOVE 30°F., REVERT TO CHART LUBRICATION.

circle symbol indicates extra light mineral oil (navy symbol 1042, 2110 or 2076)*
square indicates slush-on lubricant (O.S. 1285).
circle in square indicates bearing grease for general use in naval ordnance (o.s. 1350).
rectangle indicates special ordnance lubricant, fluid or preservative compound (o.s. 1165, n.d.s. 32-c-18, gr. 1).

* LUBRICANTS ARE SHOWN IN THE ORDER OF PREFERENCE.

Title plate, Sub Mount Mk 40, 25 cal. Pedestal Type, Wet, Plan and Front Lubrication Chart, 253589

 

84
 

Lubrication chart, right and left sides with callouts

 

85
 
DAILY OR 4 HOURS OPERATION (MINIMUM)
35 FIRING PIN (WITHDRAW AND COAT) HOUSING
38 HAND LEVER LATCH SLIDE
40 SLIDING LATCH. MANUAL OPERATION MECHANISM SLIDE
41 OPERATING SPRING CHAIN (COAT) HOUSING
52 GUN BEARING STRIP AND GUIDE RAIL. RIGHT (7 FITTINGS) SLIDE
60 SIGHT ANGLE DETENT PLUNGER SIGHT
61 SAFETY LATCH AND TRIGGER PLUNGERS SLIDE
62 CAM FOLLOWER ROLLER HOUSING
64 EXTRACTOR PLUNGERS (2 FITTINGS) HOUSING
68 GUN BEARING STRIP AND GUIDE RAIL, LEFT (7 FITTINGS) SLIDE
WEEKLY OR 30 HOURS OPERATION (MINIMUM)
37 BEARING BLOCKS (2 FITTINGS) HOUSING
38 RETRACTING LEVER SHAFT HOUSING
39 HAND LEVER SHAFT SLIDE
42 CRANK SHAFT, MANUAL OPERATION MECHANISM SLIDE
43 TRAINING PINION SHAFT (2 FITTINGS) TR. GEAR
44 SIGHT ANGLE WORM A WORMWHEEL (COAT) SIGHT
45 ELEVATING HANDWHEEL BEVEL GEARS (COAT) EL. GEAR
46 ELEVATING HANDWHEEL SHAFT (2 FITTINGS) EL. GEAR
47 ELEVATING WORM SHAFT EL. GEAR
48 ELEVATING WORM (COAT) EL. GEAR
49 ELEVATING WORMWHEEL THRUST WASHERS EL GEAR
50 ELEVATING WORMWHEEL (COAT) EL GEAR
51 HYDRAULIC CYLINDER PUSH ROD, FIRING MECHANISM CARRIAGE
53 UPPER GEARS TR. HANDWHEEL BRACKET COAT TR GEAR
54 LOWER GEARS, TR. HANDWHEEL BRACKET COAT TA GEAR
55 VERTICAL SHAFT, TR. HANDWHEEL BRACKET TR GEAR
58 BEVEL GEARS, TR PINION BRACKET (COAT) TR GEAR
57 INPUT SHAFT, TR. PINION BRACKET TR GEAR
56 SIGHT ANGLE DRUM GEARS (COAT) TR GEAR
59 SIGHT ANGLE WORM SHAFT TR GEAR
63 CHAIN WHEEL SHAFT HOUSING
65 OPERATING SHAFT (2 FITTINGS) HOUSING
66 CAM PLATE SHAFT SLIDE
67 EXTRACTOR GUIDES (2)(CLEAN THOROUGHLY BEFORE COATING) HOUSING
 
253590

GENERAL LUBRICATION INSTRUCTION - REFER TO O.D. 3000.

APPLICATION. - EXERCISE PARTS WHILE LUBRICATING.

REPORTS. - SHIPS EXPERIENCING ANY DIFFICULTY WITH THE OPERATION OF THE EQUIPMENT DUE TO LUBRICATION IN ACCORDANCE WITH THIS CHART SHOULD SUBMIT A DETAILED REPORT TO THE BUREAU OF ORDNANCE WITH COPY TO THE NAVAL GUN FACTORY.

CHECK OFF LISTS. - REDUCED SIZE PHOTOPRINT COPIES OF THESE CHARTS MAY BE OBTAINED FROM THE NAVAL RUN FACTORY FOR USE AS PERIODIC CHECK-OFF LISTS.

REFERENCE CHARTS. - FOR LUBRICATION OF PLAN AND FRONT SIDES. SEE DR. NO. 253589.

AFTER SUBMERGENCE. - THE MOUNT SHOULD BE CAREFULLY INSPECTED FOR CORROSION. RESTORED TO A SATISFACTORY OPERATING CONDITION, AND LUBRICATED IN ACCORDANCE WITH THE CHART.

SUBSTITUTIONS: UNTIL O.S. 1384 BECOMES AVAILABLE. SUBSTITUTE GRAPHITE GREASE
(FED. SPEC. VV-G-671. GR. AB).

UNTIL O.S. 1385 BECOMES AVAILABLE. SUBSTITUTE NAVY SYMBOL 5190.

UNTIL O.S. 1350 BECOMES AVAILABLE. USE THE FOLLOWING SUBSTITUTES:
EXTRA LIGHT MINERAL OIL (NAVY SYMBOL 1042, 2110 OR 2075)* AT POINTS 37,38,51,43.65,66.
MINERAL LUBRICATING GREASE (N.D.3. 14-G-1, GR. 1) AT ALL OTHER POINTS WHERE O.S. 1350 IS SPECIFIED.

NOTE:-

SHIPS SHOULD MAKE EVERY EFFORT TO OBTAIN SUPPLIES OF THE SPECIFIED LUBRICANTS. SUBSTITUTES LIMIT SATISFACTORY OPERATION.

IMPORTANT- COLD WEATHER REMEDY
(FOR SUBSTITUTE LUBRICANTS ONLY)

MINERAL LUBRICATING GREASE (M.D.S. 14-G-1, GR. I) AND NAVY SYMBOL 5190 ARE INTENDED FOR USE IN TEMPERATURES ABOVE 30° F. FOR LOWER TEMPERATURES. EXTRA LIGHT MINERAL OIL (NARY SYMBOL 1042, 2110 OR 2075)* MUST BE SUBSTITUTED. TO DO THIS, REMOVE THE GREASE FITTINGS, INJECT KEROSENE. REMOVE ALL COVER PLATES. WIPE ACCESSIBLE WORKING PARTS CLEAN WITH LINT-FREE. KEROSENE-SOAKED CLOTH. WIPE DRY AND LUBRICATE FREELY WITH EXTRA LIMIT MINERAL OIL. INSPECT REGULARLY FOR CORROSION AND LUBRICATE FREQUENTLY WITH EXTRA LIGHT MINERAL OIL TO INSURE CONTINUAL PROTECTIVE OIL FILM ON PARTS THUS TREATED. UPON RETURN TO TEMPERATURES ABOVE 30°F., REVERT TO CHART LUBRICATION.

circle symbol indicates extra light mineral oil (navy symbol 1042, 2110 or 2076)*
square indicates slush-on lubricant (O.S. 1385).
circle in square indicates bearing grease for general use in naval ordnance (o.s. 1350).
rectangle indicates special ordnance lubricant, fluid or preservative compound (o.s. 1165, n.d.s. O.S. 1084).

* LUBRICANTS ARE SHOWN IN THE ORDER OF PREFERENCE.

Title plate, Sub Mount Mk 40, 25 cal. Pedestal Type, Wet, Right and Left Sides Lubrication Chart, 253590

 

86
 

DISTRIBUTION

Requests for additional copies of OP 1029 should be submitted on NAVORD FORM 1, ORDNANCE PUBLICATIONS AND FORMS REQUISITION, to the nearest Ordnance Publications Distribution Center: Navy Yard, Wash. 25, D. C.; Adak, Alaska; Mare Island, Calif.; Pearl Harbor, T. H.; Espiritu Santo, New Hebrides; Exeter, England; Brisbane, Australia. Distribution Center mailing addresses should be obtained from List 10 nn of the Standard Navy Distribution List, or from the reverse side of NAVORD FORM 1.

DISTRIBUTION:

Standard Navy Distribution List No. 26
2 copies unless otherwise noted.

1.a,f,h,l; 2.u; 3.mm*,oo,pp; 4.mm*,oo,pp; 5.b; 7.a,f,h,l,p; 8.h*,n (SPECIAL LIST K,X,FF); 10.m*,n*,qq,ss; 10. (25 copies),nn; 11.a (BuShips); 12.a,b(Revision 1).

* Applicable Addressees.

U S. GOVERNMENT PRINTING OFFICE: 1944-S10947-15


Previous Part
Previous Part
Gun Home Page
Gun Home Page

 

Copyright © 2013, Maritime Park Association.
All Rights Reserved.
Legal Notices and Privacy Policy
Version 3.00