TM 9-2350-256-34
INTERMEDIATE MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
HOIST WINCH CIRCUIT (AUXILIARY HYDRAULIC SYSTEM) TROUBLESHOOTING PROCEDURE
INITIAL SETUP:
Test Equipment
References
Gage (item 9, WP 0086 00)
TM 9-2350-256-20
Tools and Special Tools
Tool kit, general mechanic's (item 34, WP 0086 00)
Troubleshooting Procedure
Hoist Winch Circuit (auxiliary Hydraulic System)
Symptom
Hoist winch circuit (auxiliary hydraulic system) malfunctioning.
Malfunction
Hoist winch will not operate.
CORRECTIVE ACTION
1.
Inspect all hydraulic hoses and connections for visible indication of oil leaks.
a.
Repair leaks or replace hydraulic hose (TM 9-2350-256-20).
2.
Inspect system selector valve lever for improper position.
a.
Place system selector valve lever in AUX position.
3.
Inspect APU emergency winch control valve lever for improper position.
a.
Place the APU emergency winch control valve lever in OPEN position.
WARNING
Test components must be capable of withstanding a working pressure of 14501550 psi (999810,687
kPa) (step 4 only).
4.
Test for broken drive mechanism of faulty auxiliary hydraulic pump. Disconnect auxiliary hydraulic
pump discharge hose no. 12. Install suitable gate valve, in conjunction with pressure gage, to outlet
of auxiliary hydraulic pump. When restricting oil flow, operating pressure should be 14501550 psi
(999810,687 kPa).
CAUTION
When performing auxiliary hydraulic pump pressure test, do not restrict oil flow beyond operating
pressure.
Remove APU from vehicle, and replace broken auxiliary hydraulic pump drive mechanism parts, or
faulty auxiliary hydraulic pump (WP 0083 00).
0014 00-1
