TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 412 of 775

TM 9-2350-311-10

3-4 TROUBLESHOOTING — CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

CAB TRAVERSING SYSTEM—CONTINUED

22. CAB CREEPS.

Step 1. Check positions of MASTER switch, CAB POWER switch, and TRAVERSE CONTROL switch.

Turn MASTER switch and CAB POWER switch to ON. Turn TRAVERSE CONTROL switch to

POWER.

Step 2. Check for cant in excess of 89 mils.

Level vehicle if necessary. If problem persists, notify unit maintenance.

23. TRAVERSING MECHANISM ASSEMBLY OVERHEATS.

Check oil level in traversing mechanism assembly.

Fill if oil level is low (item 46, Appx G). If oil level is not low, notify unit maintenance.

ELEVATING SYSTEM

24. CANNON DOES NOT ELEVATE OR DEPRESS UNDER POWER OR MANUALLY, BUT

HYDRAULIC PRESSURE IS NORMAL.

Step 1. Check to see if cannon tube is in travel lock.

If necessary, release travel lock.

Step 2. Check cannon equilibrator adjustment.

Adjust as necessary (para 3-6.2). If problem persists, notify unit maintenance.

25. EFFORT REQUIRED TO ELEVATE CANNON IS GREATER OR LESS THAN EFFORT REQUIRED

TO DEPRESS CANNON.

Check cannon equilibrator adjustment.

Adjust as necessary (para 3-6.2).

CAB HYDRAULIC SYSTEM

26. POWER PACK OPERATES CONTINUOUSLY WHEN CAB POWER AND MASTER SWITCHES ARE ON.

Perform zero pressure check (para 3-6.4) on main accumulator assembly.

If pressure is below 500 psi or problem persists, notify unit maintenance.

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