TM 9-2350-256-20-1
UNIT MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
TRANSMISSION AND OUTPUT REDUCTION DRIVES THEORY OF OPERATION
Transmission and Output Reduction Drives
General
The cross-drive transmission (3) is a combined transmission with steering unit and two output reduction drives (1 and 2). It
transmits power directly from the engine to the track drive sprockets. The transmission is controlled by the vehicle operator by
means of the shifting and steering controls and linkages, and the brake control pedal linkage.
The cross-drive transmission (3) includes a hydraulic torque converter, a split torque drive, variable steering, and disk-type
brakes. The transmission delivers engine power to the track sprockets at an output torque which varies automatically according
to the driven-load conditions when not in linkup.
There are three forward speed ranges and one reverse.
Steering is possible in all drive ranges and N (neutral). Steering in N (neutral) causes the vehicle to pivot in place, with the tracks
turning in opposite directions.
Figure 1. Transmission and Output Reduction Drives.
Hydraulic and Lubrication System
Functions:
1.
Applies force for clutch ranges
2.
Power transmitting medium in torque converter
3.
Lubricant for entire transmission
4.
Cooling medium for entire transmission
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