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 400 of 552

TM 9-2350-311-34-2

9-2 NO-BACK BEARING

This task covers:

a. Removal

b. Disassembly

c. Assembly

d. Installation

Tools

Artillery and turret mechanic’s tool kit

(SC 5180-95-CL-A12)

Arbor press (item 13, Appx F)

Materials/Parts

Grease (item 21, Appx B)

Gasket (item 132, Appx E)

Key washer (item 27, Appx E)

Lubricating oil (item 23, Appx B)

No-back device parts kit (item 117, Appx E)

Preformed packing (item 53, Appx E) M109A4/M109A5

Retaining ring (item 20, Appx E)

Seal (item 167, Appx E) M109A4/M109A5

Sealing compound (item 31, Appx B)

Equipment Condition

Turret lock in LOCKED position (TM 9-2350-31 l-l 0)

CAB POWER switch to OFF (TM 9-2350-311-10)

Vehicle MASTER switch to OFF (TM 9-2350-311-10)

Handwheel assembly removed (TM 9-2350-311-20-2)

a. Removal

1

Remove woodruff key (1) from shouldered shaft (2).

NOTE

Step 2 applies to only M109A4/M109A5 howitzers.

2

Remove dust protective cap (3) preformed packing (4), and seal (5). Discard preformed packing and seal.

3

Remove six cap screws (6).

NOTE

Retain shims unless new components are to be installed.

4

Remove mechanical housing (7) and shim(s) (8) from mechanical housing (9).

5

Note and record dimension “A” stamped on mechanical housing (9).

6

Remove bevel gearshaft assembly (10) and woodruff key (11) from mechanical housing (7).

NOTE

No-back bearing components will separate when removed from shouldered shaft and mechanical

housing.

7

Remove no-back bearing (12) and pin (13) from shouldered shaft (2). Discard pin.

9-6 Change 2