SECTION 29 - HYDROSTATIC TRANSMISSION
29-32
High Flow - The complete high flow pump
assembly consists of:
1 Left side pump (rear)
2 Dual back plate
3 Right side pump (front)
4 Hydraulic gear pump
5 High flow 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.
5. Remove the gear pump mounting bolts, 6, and
tap the high flow pump body with a plastic or
rubber mallet to separate the pump from the
hydraulic system pump. Try not to disturb the
internal gear pump seal at 7. Tap the hydraulic
system 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
8.
6. Remove the front pump mounting bolts, 9, and
tap the housings with a plastic or rubber mallet to
separate the pump from the dual backplate.
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7. Discard the gasket, 1, and note the two alignment
dowel pins, 2, on each side of the backplate.
8. Remove the replaceable bearing plate, 3, from
the backplate. The two bearing plates in this
assembly are not identical; the metering slots
point in opposite directions. The slots toward the
front pump point clockwise.
9. Remove the rear pump mounting bolts, 4, and
tap the housings with a plastic or rubber mallet to
separate the pump from the dual backplate.
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