Wheel Motor Efficiency: Case Drain Test
NOTE: Over a period of time, a wheel motor can wear
internally. A worn motor may by–pass oil to its case drain
causing the motor to be less efficient. Eventually,
enough oil loss will cause the wheel motor to stall under
heavy load conditions. Continued operation with a worn,
inefficient motor can generate excessive heat, cause
damage to seals and other components in the hydraulic
system and affect overall machine performance.
11.Wheel motor internal leakage will be shown on flow
meter in GPM. Flow should be less than 2 GPM for the
tested wheel motor.
12.If
specifications are not met, the tested wheel motor
needs to be repaired or replaced as necessary.
13.If
other wheel motor requires testing, complete steps
5
to 14 for the remaining motor.
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem•
14.Disconnect
hose. Reconnect hose to pump connection. Reconnect
hydraulic lines to rear wheel motor.
tester from pump hydraulic fitting and
2.
Park machine on a level surface, stop engine, en•
gage parking brake, and remove key from the ignition
switch. After turning engine off, operate all hydraulic
controls to relieve hydraulic system pressure.
1
3
CAUTION
Prevent personal injury and/or damage to equip•
ment. Read all WARNINGS, CAUTIONS, and Pre•
cautions for Hydraulic Testing at the beginning
of this section.
3.
tral position (see Adjust Traction Pedal for Neutral in the
Adjustments section of this Chapter).
Make sure that traction pedal is adjusted to the neu•
2
Figure 20
4.
and an immovable object to prevent the machine from
moving during testing.
Attach a heavy chain to the rear of the machine frame
1.
2.
Wheel motor (RH shown)
Hydraulic tee fitting
3. Pressure hose
2
5.
Chock rear wheel being tested to prevent rotation of
the wheel. Make sure parking brake is engaged.
6.
Disconnect hydraulic tee fitting and pressure hose
from rear wheel motor that is not being tested (Fig. 20).
Cap disconnected fitting and hose. Plug ports in wheel
motor to prevent contamination.
1
7.
Disconnect hose from the upper hydraulic fitting on
the right side of the piston (traction) pump (Fig. 21).
8.
Install tester with pressure gauges and flow meter in
series with the piston pump and the disconnected hose.
Make sure the tester flow control valve is fully open.
Figure 21
9.
Start engine and move throttle to high idle (3050 –
3150
RPM).
1.
Upper hydraulic hose
2.
Piston (traction) pump
10.Sit
on seat, apply brakes fully, and slowly depress the
traction pedal in forward direction until 1000 PSI is dis•
played on the tester pressure gauge.
Multi Pro 5700–D
Page 4 – 23
Hydraulic System
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