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 411 of 775
TM 9-2350-311-10
3-4 TROUBLESHOOTING — CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CAB TRAVERSING SYSTEM
20. CAB WILL NOT TRAVERSE FREELY IN MANUAL MODE.
NOTE
All attempts to traverse should be made manually only.
Step 1. Check to see if travel lock and turret lock are fully released.
Release travel lock and turret lock (para 2–10.8).
Step 2. Check position of TRAVERSE CONTROL switch.
Turn TRAVERSE CONTROL switch to MANUAL position.
Step 3. Check vehicle interior and exterior for obstructions that may impede traversing.
Clear obstructions.
Step 4. Check for dirt, rust, or other obstructions on main drive gears or cab race ring gear.
Clean as necessary. If problem persists, notify unit maintenance.
21. CAB WILL NOT TRAVERSE FREELY IN POWER MODE.
Step 1. Check to see if travel lock and turret lock are fully released.
Release travel lock and turret lock (para 2–10.8).
Step 2. 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 3. Check oil level in traversing mechanism assembly.
Fill if oil level is low (item 46, Appx G).
Step 4. Check hydraulic pressure in accumulator assembly.
Correct hydraulic pressure is 925 to 1225 psi (6378 to 8446 kPa). If high or low, notify unit
maintenance.
Step 5. Check for electrical failure of clutch valve in M109A4/M109A5 howitzer by pulling up on override lever
while power traversing (para 2–10.8).
If cab traverses, the electrical solenoid in clutch valve is faulty, notify unit maintenance. Operate
override lever and power traverse.
3-11
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