"3072RT / 3772RT / 3772RT HD" Service & Parts Manual - ANSI Specifications March 2008
Page 1-7
HYDRAULIC PUMP
Note: Refer to
Hydraulic Manifold
and
Relief Pressure Adjustment Procedure
.
Refer to
Section 3
for Remove and Replace instructions.
An internal combustion engine drives a variable displacement axial piston pump. Flow is propor-
tional to drive speed and displacement. The pump is not serviceable. A faulty pump must be
replaced.
WHEEL DRIVE
Note: Refer to
Section 3
for Remove and Replace instructions.
There are four (4) hydraulic, fixed-displacement gear wheel motors to provide power to all four
wheels [two (2) front and two (2) rear].
Dynamic Braking Circuit
The two rear wheel motors have integral brakes that are spring held. Hydraulic pressure devel-
oped in the drive circuit, during drive mode, releases the brakes. A fixed orifice in the brake circuit
controls the deceleration rate and initiates a smooth stop.
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