TM 9-2350-256-20-1
UNIT MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
MECHANICAL TRANSMISSION TROUBLESHOOTING PROCEDURE
INITIAL SETUP:
Tools and Special Tools
References
Tool kit, general mechanic's (item 59, WP 0490 00)
Gage, pressure (item 156, WP 0488 00)
WP 0297 00
STE/ICE-R kit (item 163, WP 0488 00)
WP 0342 00
WP 0417 00
Troubleshooting Procedure
Mechanical Transmission
Symptom
Mechanical transmission malfunctioning.
Malfunction
Mechanical transmission fails to operate, slips, or chatters. Do steps 1 thru 4.
CORRECTIVE ACTION
1.
Remove front air inlet grilles (see WP 0342 00). Inspect power takeoff coupling to see that drive shaft is
firmly attached to power takeoff coupling. Tighten bolts and/or replace missing bolts and lockwashers.
2.
Have assistant start engine. Observe power takeoff coupling and drive shaft. If the power takeoff
coupling and drive shaft are not turning, turn off engine and remove powerplant (see WP 0098 00).
Tighten power takeoff retaining nut. Torque nut to 240250 lb-ft (325-339 Nm). Reinstall powerplant
(see WP 0098 00).
3.
Remove rear center subfloor plate (see WP 0297 00). Remove pipe plug in mechanical transmission
and perform STE/ICE-R test 50 (pressure gage optional) (items 156 and 163, WP 0488 00). Lubricating
oil pressure should be 1019 psi (69131 kPa). If lubricating oil pressure is not 1019 psi (69131
kPa), notify Direct Support Maintenance.
4.
Disconnect hydraulic line (see WP 0417 00). Install tee and perform STE/ICE-R test 50 (pressure
gage optional) (items 156 and 163, WP 0488 00). Connect hydraulic line. Operate engine at 1600 rpm.
Mechanical transmission clutch operating pressure should be 140225 psi (9651551 kPa). If clutch
pressure is not 140225 psi (9651551 kPa), notify Direct Support Maintenance.
END OF WORK PACKAGE
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