SECTION 21 - TRANSMISSION 3
1. POWERSHUTTLE TRANSMISSION “TURNER MODEL COM-T4-2025”
This transmission is used on powershuttle loader
backhoe models 580SR / 580SR+ / 590SR.
The transmission consists of a torque converter, an
internal rotor-type hydraulic pump, an oil distributor,
a solenoid control valve assembly, two hydraulically
operated clutches, a 4-speed synchromesh
geartrain, transmission case and oil cooler tubes.
NOTE: a conventional clutch is not used with this
transmission.
The transmission case serves as an oil tank for the
torque converter and hydraulic clutch assemblies.
The transmission receives power from the engine (1)
by a fluid coupling in the torque converter (2) and hy-
draulic clutch assemblies in the transmission (3).
1.1 SPECIFICATIONS
GEAR RATIO
COLD START BY-PASS VALVE SPRING
Free length.......................................................................................................................... 53.4 mm ± 0.96 mm
FORWARD CLUTCH SPRING
Free length............................................................................................................................................ 76.6 mm
CLUTCH PISTON SPRING
Free length............................................................................................................................................ 75.9 mm
DETENT SPRING
Free length (Approximately)................................................................................................................ 42.06 mm
Forward Reverse
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4.824 2.998 1.408 0.792 4.020 2.496 1.173 0.660
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