TM-9-2350-311-34-2 Maintenance Manual for Volume 2 M109 Cab Download
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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