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 99 of 584
TM 9-2350-256-34
0012 00
INTERMEDIATE MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
HOISTING BOOM CIRCUIT (MAIN HYDRAULIC SYSTEM) TROUBLESHOOTING PROCEDURE
INITIAL SETUP:
Test Equipment
Gage (item 9, WP 0086 00)
Tester kit, hydraulic pump (item 14, WP 0086 00)
Tools and Special Tools
Tool kit, general mechanic’s (item 34, WP 0086 00)
References
TM 9-2350-256-10
References (cont.)
TM 9-2350-256-20
WP 0051 00
WP 0065 00
WP 0066 00
WP 0068 00
WP 0079 00
WP 0082 00
Troubleshooting Procedure
Hoisting Boom Circuit (Main Hydraulic System)
Symptom
Hoisting boom circuit (main hydraulic system) malfunctioning.
Malfunction
Boom will not operate.
Do steps 1 thru 15.
Boom operates partially.
Do steps 16 and 17.
Boom will not hold in any position.
Do steps 18 and 19.
Boom will not stop automatically after live boom operation.
Do steps 20 and 21.
Boom live operation does not function.
Do step 22.
CORRECTIVE ACTION
1.
Attempt operation of main winch, hoist winch, and spade.
a.
If main winch, hoist winch, and spade operate, proceed to step 13.
b.
If main winch, hoist winch, and spade do not operate, proceed with 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 hoses.
a.
Replace any broken or restricted hoses (TM 9-2350-256-20).
4.
Test for defective power control valve or restricted hose. Remove hose no. 66 from mechanical
transmission. With mechanical transmission drive shaft rotating and power control valve lever placed
in ON position, oil should flow from hose.
a.
Replace defective power control valve (WP 0065 00).
b.
Replace restricted or damaged hose (TM 9-2350-256-20).
5.
Inspect mechanical transmission output shaft. If not rotating, proceed with mechanical transmission
clutch pressure check. Install pressure gage in mechanical transmission clutch pressure line. For
0012 00-1
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