RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
HOIST WINCH CIRCUIT (MAIN HYDRAULIC SYSTEM) TROUBLESHOOTING PROCEDURE
Tools and Special Tools
Hoist Winch Circuit (main Hydraulic System)
Hoist winch circuit (main hydraulic system) malfunctioning.
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.
Close APU emergency winch control valve for main hydraulic system operation.
Attempt operation of main winch, boom, and spade.
If main winch, boom, and spade operate, proceed to step 9.
If main winch, boom, and spade do not operate, proceed to step 2.
Inspect mechanical transmission drive shaft.
Inspect mechanical transmission for broken or restricted hose.
Replace mechanical transmission hose (TM 9-2350-256-20).