SECTION 29 - HYDROSTATIC TRANSMISSION
29-31
Op. 29 100 46
DISASSEMBLY
1. Remove the port fittings and plug all the ports to
prevent dirt or solvent from entering the pump
body. Thoroughly clean the complete pump
assembly before disassembly.
2. To ensure proper reassembly, use a marker to
mark lines across the pump housing and
backplates. Also mark the location of the control
shafts for proper assembly.
Without High Flow - The hydrostatic pump
assembly consists of:
1 Left side pump (rear)
2 Dual back plate
3 Right side pump (front)
4 Hydraulic gear pump
The back plate carries high pressure oil from the
pumps to the motors through the high pressure
hoses. The low pressure return oil from the
motors flows back to the pump through the back
plates to complete the closed loop circuit.
3. Remove the gear pump mounting bolts, 5, and
tap the pump body with a plastic or rubber mallet
to separate the pump from the hydrostatic pump.
Try not to disturb the internal gear pump seal at
6.
4. Remove the front pump mounting bolts, 7, and
tap the housings with a plastic or rubber mallet to
separate the pump from the dual backplate.
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