Textron JACOBSEN R-311 69166, Technical/Repair Manual

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HYDROSTATIC POWER TRAIN
4203781 First Edition 5-37
5
Figure 5-27
7. Disconnect hoses (4 and 5).
Figure 5-28
8. Connect test hose (11) of flow meter inlet to hose (5).
9. Connect test hose (10) of flow meter inlet to fitting
(6).
10. Connect test hose (8) of flow meter outlet to hose (4).
11. Connect test hose (9) of flow meter outlet to fitting
(3).
12. Open flow meter valve (7) completely before starting
engine.
13. Set park brake.
14. Bypass seat switch.
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
15. Start engine, release park brake, and run at full
throttle (2800 rpm ± 50).
16. Adjust flow lock tool (2) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
17. 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.
18. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 15 gpm (57 lpm)
in the forward direction.
19. Engage 4WD switch in the forward position.
20. Read and record no load flow.
21. Slowly close flow meter valve (7) until pressure
reaches 2625 psi (181 bar). Read and record loaded
flow.
22. Open flow meter valve (7), stop engine, and set park
brake. Return flow lock tool back to neutral position.
23. Calculate traction system leakage.
(Step 20 – Step 21 / Step 20 x 100 = Leakage
Percentage)
Is traction system leakage 10% or less?
YES The traction system is good. Continue to
step 34.
NO Proceed to next question.
Is traction system leakage 11% to 20%?
YES The traction system is marginal. Continue to
step 24.
NO Proceed to next question.
Is traction system leakage 21% or more?
YES The traction system is faulty. Continue to
step 24.
2WD System Test
Figure 5-29
24. Install blocking disks at locations (12 and 13) to block
oil from 4WD valve.
25. Disengage 4WD switch.
5
4
3
6
TN2339
10
TN1357
9
7
11
8
TN2339
12
13