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 81 of 552
TM 9-2350-311-34-2
2-22.4 Quick Guide to Troubleshooting List
ITEM
SYMPTOM
BREECH MECHANISM
BREECH DOES NOT OPEN MANUALLY.
PARAGRAPH
2-23a.(1)
CANNON AND MOUNT
BREECH DOES NOT CLOSE COMPLETELY.
2-23a.(2)
BREECH DOES NOT OPEN AUTOMATICALLY AFTER FIRING.
Repair operating crank assembly.
5-7
BREECHBLOCK OVERROTATES. Inspect breechblock notch for wear.
5-6
JERKY RECOIL.
EXCESSIVE RECOIL FORCE.
EXCESSIVE RECOIL TRAVEL AT HIGH ANGLE OF FIRE.
INSUFFICIENT RECOIL TRAVEL.
2-23b.(1)
CANNON DOES NOT RETURN TO BATTERY.
2-23b.(2)
PRIMER DOES NOT FIRE. Repair breech mechanism.
5-5
ARROWS ON SPUR GEAR SECTOR WILL NOT ALINE OR DO NOT
SEPARATE.
2-23b.(3)
VARIABLE RECOIL SYSTEM WILL NOT MAINTAIN PROPER
HYDRAULIC PRESSURE.
2-23b.(4)
CAB TRAVERSING SYSTEM
CAB WILL NOT TRAVERSE UNDER POWER OR MANUALLY,
BUT HYDRAULIC PRESSURE IS NORMAL AND CAB LIGHTING
OPERATES.
2-23c.(1)
MANUAL TRAVERSE HANDWHEEL ROTATES WHILE TRAVERSING
IN POWER.
2-23c. (2)
CAB WILL NOT TRAVERSE UNDER POWER, MANUAL OPERATION
IS NORMAL.
2-23c. (2.1)
CAB WILL NOT TRAVERSE FREELY IN MANUAL OR POWER MODES.
2-23c.(3)
CAB CREEPS.
2-23c.(4)
HANDWHEEL SLIPS WHEN OPERATED MANUALLY.
2-23c.(5)
TRAVERSING MECHANISM ASSEMBLY OVERHEATS. Repair or
replace oil pump.
9-5
GUNNER’S CONTROL HANDLE BINDS WHEN TRAVERSING.
2-23c.(6)
NOISY OPERATION WHILE TRAVERSING.
2-23c.(7)
ELEVATING SYSTEM
CANNON DOES NOT ELEVATE OR DEPRESS UNDER POWER OR
MANUALLY, BUT HYDRAULIC PRESSURE IS NORMAL. Repair or
replace safety relief elevation valve assembly.
6-12
CANNON DOES NOT ELEVATE OR DEPRESS SMOOTHLY.
2-23d.(1)
CANNON WILL NOT MOVE UNDER POWER FROM EITHER CONTROL
HANDLE, BUT MANUAL OPERATION IS NORMAL. Repair or
replace selector valve assembly.
6-13
CANNON DOES NOT ELEVATE OR DEPRESS USING MANUAL
ELEVATION SYSTEM OR SYSTEM IS INEFFICIENT, BUT CANNON
WILL OPERATE UNDER POWER. Repair or replace axial pump.
6-16
CANNON CREEPS UP OR DOWN.
2-23d.(2)
HYDRAULIC FLUID LEAKS FROM FRONT OR REAR OF EQUILI-
BRATED ELEVATION MECHANISM ASSEMBLY. Repair or replace
equilibrated elevation mechanism assembly.
6-11
Change 2
2-19
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