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Procedure for Wheel Motor Efficiency
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic reservoir is full.
2. Make sure that traction lever is adjusted to the neu-
tral position (see Operator’s Manual).
3. Park machine on a level surface with the coring head
fully raised. Make sure engine is off and the parking
brake is engaged. Secure coring head with service
latch.
4. Read Precautions For Hydraulic Testing in this sec-
tion.
CAUTION
draulic oil.
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
5. Attach a heavy chain between the rear of the ma-
chine frame and an immovable object to prevent the ma-
chine from moving during testing.
6. If front wheel motor requires testing:
A. Both rear wheel motors should have hydraulic
lines connected. Block up both rear wheels off the
ground. Release parking brake so rear wheels can
turn.
B. Position front wheel on the ground. Immobilize
front wheel to prevent it from turning.
7. If a rear wheel motor requires testing:
A. Disconnect both hydraulic lines from rear wheel
motor that is not being tested. Cap disconnected hy-
draulic lines and plug wheel motor ports to prevent
contamination.
B. Front wheel motor should have hydraulic lines
connected. Block up front wheel off the ground.
C. Make sure parking brake is engaged to prevent
rear wheel rotation.
8. Clean hose fitting and disconnect hose from upper
90
o
fitting on traction pump (Fig. 25).
IMPORTANT: Make sure oil flow indicator arrow on
the flow gauge is showing that the oil will flow from
the wheel motor, through the tester and into the
traction pump fitting.
9. Install hydraulic tester with flow meter and pressure
gauges between the disconnected hose and traction
pump. Make sure flow control valve on the tester is fully
open.
10.Start engine and move throttle to full speed (3400 +
50 RPM).
CAUTION
Use extreme caution when performing test. The
tire(s) on the ground will be trying to move the
machine forward.
11. Slowly push traction lever in forward direction until
1000 PSI is displayed on the pressure gauge. Make sure
that wheel motor being tested does not rotate.
12.Wheel motor internal leakage will be shown on flow
meter in GPM. Flow should be less than 1.5 GPM for
the tested wheel motor.
13.Release traction lever and turn off engine. Record re-
sults of hydraulic flow test.
14.If specifications are not met, the tested wheel motor
needs to be repaired or replaced as necessary.
15.Reconnect hydraulic lines to wheel motor.
16.If additional wheel motor(s) require testing, complete
steps 6 to 14 for the remaining wheel motor(s).
17.Disconnect tester from machine. Reconnect hose to
pump connection.
1
2
Hydraulic
System
Figure 25
1. Upper 90
o
fitting 2. Lower 45
o
fitting
ProCore 648 Page 4 – 29 Hydraulic System