TM-9-2350-256-34
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 2005
TM-9-2350-256-34 - Page 109 of 584
TM 9-2350-256-34
0016 00
INTERMEDIATE MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
HOISTING BOOM CIRCUIT (AUXILIARY HYDRAULIC SYSTEM) TROUBLESHOOTING PROCEDURE
INITIAL SETUP:
Test Equipment
Gage (item 9, WP 0086 00)
Tools and Special Tools
Tool kit, general mechanic’s (item 34, WP 0086 00)
References
TM 9-2350-256-20
WP 0063 00
WP 0083 00
Troubleshooting Procedure
Hoisting Boom Circuit (Auxiliary Hydraulic System)
Symptom
Hoisting boom circuit (auxiliary hydraulic system) malfunctioning.
Malfunction
Boom 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 CLOSED position.
WARNING
Test components must be capable of withstanding a working pressure of 1450–1550 psi (9998–10,687
kPa) (step 4 only).
4.
Test for broken drive mechanism or 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 1450–1550 psi
(9998–10,687 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).
0016 00-1
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