TM-9-2350-311-34-2

CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS HOWITZER, MEDIUM, SELF-PROPELLED, 155MM

TECHNICAL MANUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE MANUAL

SEPTEMBER 1994

TM-9-2350-311-34-2 - Page 403 of 552

TM 9-2350-311-34-2

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Apply lubricating oil to bore of lock ring (27) and install with upper drive bearing (25) onto lower drive bear-

ing (26), ensure that six springs (29) and lockbar (28) remain in place and lower and upper drive bearing

interlock.

Pack ball bearings and coat internal gearing with grease before assembly.

Install ball bearing (24) and new retaining ring (23) in bearing retainer (19).

Calculate thickness of new shim(s) (8) (not shown). Shim thickness is equal to B + C + D - A to give a

0.002 to 0.004 inch (0.05 to 0.10 mm) backlash on M109A2/M109A3 howitzers or a 0.001 to 0.004 inch

(0.025 to 0.10 mm) backlash on M109A4/M109A5 howitzers. Peel off laminations to obtain required thick-

ness.

Install new key washer (20) and round nut (21) on bearing retainer (19).

Bend locking tabs of key washer (20) to secure round nut (21).

Apply sealing compound to new gasket (18) and install on bearing retainer (19).

Install bearing retainer (19) on bevel gearshaft (22).

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