TM 9-2350-256-34
INTERMEDIATE MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
HOIST WINCH CIRCUIT (MAIN HYDRAULIC SYSTEM) TROUBLESHOOTING PROCEDURE
INITIAL SETUP:
Test Equipment
References (cont.)
Gage (item 9, WP 0086 00)
TM 9-2350-256-20
Tester kit, hydraulic pump ( item 20, WP 0086 00)
Tools and Special Tools
Tool kit, general mechanic's (item 34, WP 0086 00)
References
Troubleshooting Procedure
Hoist Winch Circuit (main Hydraulic System)
Symptom
Hoist winch circuit (main hydraulic system) malfunctioning.
Malfunction
Hoist winch will not operate.
Do steps 1 thru 14.
Hoist winch pays in but will not pay out.
Do steps 15 thru 18.
Hoist winch pays out but will not pay in.
Do steps 19 and 20.
Hoist winch creeps in either direction when in hold position. Do step 21.
Hoist winch will not hold load.
Do steps 22 thru 24.
Insufficient main system oil pressure. Do steps 25 thru 27.
CORRECTIVE ACTION
CAUTION
Close APU emergency winch control valve for main hydraulic system operation.
1.
Attempt operation of main winch, boom, and spade.
a.
If main winch, boom, and spade operate, proceed to step 9.
b.
If main winch, boom, and spade do not operate, proceed to step 2.
2.
Inspect mechanical transmission drive shaft.
a.
If not rotating, repair or replace (WP 0066 00).
3.
Inspect mechanical transmission for broken or restricted hose.
a.
Replace mechanical transmission hose (TM 9-2350-256-20).
0009 00-1
