Procedure for Wheel Motor Efficiency Test:
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
A. The front motor can be removed from the traction
circuit by disconnecting the hydraulic hose from the
hydraulic tube leading to the front wheel motor upper
port. Disconnect tester hose from hydraulic tube
leading to the front wheel motor lower port. Then, to
allow flow to the rear wheels, connect the flow meter
hose to the disconnected hydraulic hose.
1.
2.
lowered. Make sure engine is off and the parking brake
is engaged.
Park machine on a level surface with the attachment
B. A rear motor can be removed from the traction cir-
cuit by disconnecting and capping the two hydraulic
lines at the motor.
3.
4.
Read Precautions for Hydraulic Testing.
Make sure that traction pedal is adjusted to the neu-
13.After
removing a motor from the circuit, retest using
steps 6 through 10 making sure that the remaining drive
wheels are locked (not rotating) during testing. Test
wheel motor leakage in three different wheel positions
for accurate test results. When a worn motor is removed
from the traction circuit, the test results should show a
decrease in leakage flow from the system. Any wheel
motor that has leakage greater than .7 GPM (2.6 LPM)
needs to be repaired or replaced.
tral position (see Operator’s Manual).
IMPORTANT: Make sure to thoroughly clean around
all hydraulic connections that will be disassembled.
5.
tester connections as Traction Pump (P1) Flow Test.
Install hydraulic tester (flow meter) using the same
Make sure the tester flow control valve is fully open.
6.
at low idle speed. Check for hydraulic leakage and cor-
rect before proceeding with test.
After installing hydraulic tester, start engine and run
Example: Consider a machine that has a total wheel
motor internal leakage of 3.5 GPM (13.2 LPM). When
the right, rear wheel motor is removed from the traction
circuit, the system leakage decreases to 1 GPM (3.8
LPM). The leakage for the disconnected motor is 2.5
GPM (9.5 LPM) which indicates the need to repair or re-
place the right, rear wheel motor.
7.
wheel to prevent front wheel rotation.
Make sure parking brake is engaged. Chock the front
CAUTION
Multiple wheel motors may be worn, so efficiency testing
of all wheel motors may be required. After an individual
motor is tested, reconnect that motor before proceeding
to test another motor.
Use extreme caution when performing test. The
drive wheels will be trying to move the machine.
14.After
machine and reconnect all hydraulic lines.
testing is completed, disconnect tester from
8.
Move throttle to full speed (3400 RPM).
9.
al in the forward direction until 1000 PSI (69.0 bar) is
displayed on the tester pressure gauge.
Sit in the operator seat and slowly push traction ped-
15.Make
Manual).
sure hydraulic tank is full (see Operator’s
10.With
all drive wheels locked (not rotating), total inter-
nal leakage for all wheel motors will be shown on the
flow meter. Flow should be less than 2 GPM (7.6 LPM).
Record test results.
11.
Release traction pedal, shut engine off, rotate
wheels and retest. Testing of wheel motor leakage in
three different wheel positions will provide the most ac-
curate test results.
1
2
12.If
specification is not met, individual wheel motors
need to be removed from the traction circuit to deter-
mine which motor(s) is leaking excessively.
Figure 24
1.
Tube to lower motor port
2.
Hydraulic hose
Sand Pro & Infield Pro 3040/5040
Page 4 – 29
Hydraulic System
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