KB21 Service Manual Pub 09-14
45
sSection 30
The hydraulic pumps and motors used on the Terrain King utilize a Pressure Balanced Thrust Plate
Design. This design allows the oil pressure to hydraulically balance the thrust plates and squeezes
them against the gear faces. This provides a seal between the gear face and the thrust plate surface
preventing the high-pressure oil from leaking back to the low-pressure (inlet) side. Mechanical seals
on the thrust plate prevent oil from leaking between the plate and the adjoining casting. The seals de-
picted in the illustration are known as Pocket seals, a channel type seal may be used on other units
with the same results.
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