5-42 4203781 First Edition
HYDROSTATIC POWER TRAIN
5
Figure 5-36: Front Axle Motor Test—Blocking Disks
Blocking Oil to 4WD Valve, All Wheels Restrained
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
8. Start engine, release park brake, and run at full
throttle (2800 rpm ± 50).
Figure 5-37: Reference picture only, actual flow lock
tool will differ.
9. Adjust flow lock tool (7) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
10. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve until a reading of 1750 psi (121 bar)
or one half of the relief valve rating is reached. Warm
oil to 120–150° F (49–65° C); open valve fully after
operating temperature is reached.
11. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 15 gpm (57 lpm)
in the forward direction.
12. Slowly close flow meter valve until pressure reaches
2625 psi (181 bar). Read and record loaded flow.
13. Open flow meter valve, stop engine, and set park
brake. Return flow lock tool back to neutral position.
14. Calculate front axle motor leakage.
(Step 12 of traction pump test – Step 12 / Step 12 of
traction pump test x 100 = Leak Percentage)
Is front axle motor leakage 10% or less?
YES The front axle motor is good. Proceed to
step 15.
NO Proceed to next question.
Is front axle motor leakage 11% to 20%?
YES The front axle motor is marginal. Additional
testing is required. Continue to step 15.
NO Proceed to next question.
Is front axle motor leakage 21% or more?
YES Repair or replace front axle motor. (See
“Front Axle Motor” on page 5-58.)
15. Remove blocking disks from locations (5 and 6).
Secondary 4WD Shuttle Valve Test
Figure 5-38
16. Install blocking disks at “L1” and “R1” locations (8
and 9) of 4WD valve.
TN2358
7
TN1364
8
TN2313
9
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