Chapter XI

A. DATA SHEET

B. LUBRICATION INSTRUCTIONS

1. Lubricants and Compounds Used:

a. Oil:

b. Grease:

c. Cleaning Solvents:

2. Daily

Oil the gun bore. Remove and disassemble the breech block, clean the parts, and coat with light film of oil. Clean and oil the inner cranks. Clean and oil the breech block guides in the housing.

3. After Firing

As soon as practicable after firing, depress the gun, clean, dry and coat the bore with a film of oil. Oil the breech mechanism in accordance with the daily schedule.

Also, if the gun gets wet or dirty, or if there is any reason to expect corrosion to start.

a. Loader: Remove the loader and the rammer tray from the slide, and oil all loader sliding surfaces, springs and bearings. Use lubricant sparingly and exercise parts after lubricating. Coat all unpainted surfaces with a light film of oil or grease. Oil all working parts of the tray and coat all surfaces with a light film of oil or grease.

b. Housing: Remove and disassemble the housing. Clean all parts except the closing spring assembly with solvent, and coat all surfaces with a light film of oil. The breech block closing spring assembly is packed with grease and need not be disassembled. Use lubricant sparingly.

c. Slide: Oil all working parts. Apply a light film of oil or grease to all unpainted surfaces. Apply one shot with pressure gun at each of the six grease fittings after reassembly of mechanism.

d. Barrel: Clean, dry and coat the gun bore with light film of oil. Clean the barrel threads and coat with film of grease. Coat the outside surfaces of the water jacket and the recoil spring with a film of grease.

The following parts, if disassembled for repairs, should be repacked with grease at assembly:

C. FILLING THE RECOIL CYLINDER

To fill the recoil cylinder, elevate the gun to about twenty-five degrees, remove the fill plug, and unscrew the needle valve several turns. Using the filling funnel, pour the liquid in slowly until it overflows. Replace the plug and elevate and depress the gun slowly several times, returning the gun to

D. VARIATIONS

1. Elevating Arc

Elevating arcs have been manufactured by two different methods. Elevating arc (298728-1) is a casting, while elevating arc (345795) is a weldment.

2. Breech Block

In breech blocks of earlier manufacture, the firing hole bushing (298682-2) is threaded, and installed in the breech block by the use of the wrench (298869-6), and locked in place by the use of the locking pin (298681-2).

In later breech blocks, the firing hole bushing is an integral part of the breech block.

3. Loader

In loaders of later manufacture, no feed control thumb lever (298784-1) will be found. Consequently the instructions in Chapter VI to place this lever on the red arrow position are to be disregarded in operating these mechanisms.

Requests for copies of Ordnance Pamphlet No. 820 should be addressed to the nearest BuOrd Publications Distribution Center:

DISTRIBUTION:

Standard Navy Distribution List No. 15
2 copies each unless otherwise noted.

1. (1 copy), a-h, j-n, q-t, x, z-ff, ii-ll, nn, oo, qq, ss-zz; 2. (1 copy), d-h, n-p, s, t, v, bb, dd, gg; 3. a*, e*, f*, i*, j*, k*, 1*, r*, t*, x*, bb*, dd*, hh*, jj*, kk*, qq*, xx*, zz*, aaa,* ddd*, eee*; 4. a*, b*, e*, f*, g, i*, j*, k*, 1*, r*, t*, x*, bb*, dd*, k k*, qq*, tt*, uu*, vv, xx, yy*; 6. (3 copies), a-p; 7. a-c, f-i, j, 1 (Des Bases only), o, x, y, aa; 8. h (NOL and No. Beach only), i, j, n (SPECIAL LIST K, L, 0, S, V, Z, AA), q, r, u, gg; 8. (3 copies), x; 10. s, t; 11. a (Vice CNO, SecNav, ComdtMarCorps); 12.; 14. a.

* Applicable Ships.

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