HYDROSTATIC POWER TRAIN
4203780 First Edition 5-39
5
25. Disengage 4WD switch.
Figure 5-32: 2WD Traction System Test—Blocking
Disks at 4WD Valve, All Wheels Restrained
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
26. Start engine, release park brake, and run at full
throttle (2800 rpm ± 50).
27. Adjust flow lock tool (2) to allow pump to produce 15
gpm (57 Lpm) in the forward direction.
28. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (7) 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.
29. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 15 gpm (57 Lpm)
in the forward direction.
30. Read and record no load flow.
31. Slowly close flow meter valve (7) until pressure
reaches 2625 psi (181 bar). Read and record loaded
flow.
32. Open flow meter valve (7), stop engine, and set park
brake. Return flow lock tool back to neutral position.
33. Calculate traction system leakage.
(Step 30 – Step 31 / Step 30 x 100 = Leakage
Percentage)
Is 2WD traction system leakage 10% or less?
YES The pump and front axle motor are good.
The 4WD system is faulty. (See “Front Axle
Motor Test” on page 5-42.)
NO Proceed to next question.
Is 2WD traction system leakage 11% to 20%?
YES Test individual components in the traction
system.
NO Proceed to next question.
Is 2WD traction system leakage 21% or more?
YES Test individual components in traction
system for leakage.
34. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
35. Install and connect all components as noted prior to
test.
36. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for oil
specifications.)
TN2089
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