HYDROSTATIC POWER TRAIN
4181383 First Edition 5-19
5
12. Calculate traction pump leakage.
(Step 9 – Step 10 / Step 9 x 100 = Leak Percentage)
Is traction pump leakage 10% or less?
YES The traction pump is good. Proceed to
step 17.
NO Proceed to next question.
Is traction pump leakage 11% to 20%?
YES The traction pump is marginal. Additional
testing is required. Continue to step 13.
NO Proceed to next question.
Is traction pump leakage 21% or more?
YES Repair or replace traction pump. (See
“Traction Pump” on page 5-27.)
!
CAUTION
13. Open flow meter valve (2) completely before starting
engine.
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
14. Start engine, release brake, and run at full throttle
(2850 rpm ± 50).
15. Adjust flow lock tool (6) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
16. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (2) until a reading of 1800 psi (124
bar) or one half of the relief valve rating is reached.
Warm oil to 120—150°F (49—65°C).
17. Continue to close flow meter valve (2) until zero flow
is obtained. Record forward system relief valve
pressure.
18. Stop engine, apply brake, and return flow lock tool
back to neutral position.
NOTE
Reverse system relief valve test is similar.
19. To test reverse system relief valve, swap hoses
(4 and 5) at flow meter.
20. Open flow meter valve (2) completely before starting
engine.
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
21. Start engine, release brake, and run at full throttle
(2850 rpm ± 50).
22. Adjust flow lock tool to 15 gpm (57 lpm) in reverse
direction.
23. Close flow meter valve (2) until zero flow is obtained
and record reverse system relief valve pressure.
24. Stop engine, apply brake, and return flow lock tool
back to neutral position.
Is forward system relief pressure 3625 psi (250
bar)?
YES Forward system relief valve is good. Proceed
to step 25.
NO Replace forward system relief valve. (See
“Traction Pump” on page 5-27.)
Is reverse system relief pressure 3625 psi (250
bar)?
YES Reverse system relief valve is good. Proceed
to step 25.
NO Replace reverse system relief valve. (See
“Traction Pump” on page 5-27.)
25. If no further testing is required, disconnect and
remove test equipment. Install all hoses and fittings
as noted prior to removal.
26. Install and connect all components as noted prior to
test.
27. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for oil
specifications.)
Do not exceed 3650 psi (252 bar) when testing
system relief valves or equipment damage may
occur.
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