Jacobsen AR3, Technical/Repair Manual

Page: 165 / 342

5-18 4181384 First Edition
HYDROSTATIC POWER TRAIN
5
NOTE
Verify engine rpm is within specification (3150 rpm ± 50)
to ensure accurate hydraulic test results.
19. Start engine and run at full throttle (3150 rpm ± 50).
20. Adjust flow lock tool (3) to allow pump to produce 10
gpm (37.8 lpm) in the forward direction.
21. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (2) until a reading of 1525 psi (105
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.
22. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 10 gpm (37.8 lpm)
in the forward direction.
23. Slowly close flow meter valve until pressure reaches
2300 psi (158 bar). Read and record loaded flow.
24. Stop engine and return flow lock tool back to neutral
position.
25. Calculate right front wheel motor leakage.
(Step 13 of previous test – Step 23 / Step 13 of
previous test x 100 = Leak Percentage)
Is right front wheel motor leakage 10% or less?
YES The right front wheel motor is good. Proceed
to step 26.
NO Proceed to next question.
Is right front wheel motor leakage 11% to 20%?
YES The right front wheel motor is marginal.
Additional testing is required. Continue to
step 26.
NO Proceed to next question.
Is right front wheel motor leakage 21% or more?
YES Repair or replace right front wheel motor.
(See “Front Wheel Motor” on page 5-25.)
26. Remove wheel restraints from both front wheels.
27. Install wheel restraint to rear wheel.
!
WARNING
28. Lift front of machine and support with stands.
29. Open flow meter valve (2) completely before starting
engine.
NOTE
Verify engine rpm is within specification (3150 rpm ± 50)
to ensure accurate hydraulic test results.
30. Start engine and run at full throttle (3150 rpm ± 50).
31. Adjust flow lock tool (3) to allow pump to produce 10
gpm (37.8 lpm) in the forward direction.
32. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve until a reading of 1525 psi (105 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.
33. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 10 gpm (37.8 lpm)
in the forward direction.
34. Slowly close flow meter valve until pressure reaches
2300 psi (159 bar). Read and record loaded flow.
35. Stop engine and return flow lock tool back to neutral
position.
36. Calculate rear wheel motor leakage.
(Step 23 of previous test – Step 34 /Step 23 of
previous test x 100 = Leak Percentage)
Is rear wheel motor leakage 10% or less?
YES The rear wheel motor is good. Proceed to
step 37.
NO Proceed to next question.
Is rear wheel motor leakage 11% to 20%?
YES The rear wheel motor is marginal. Repair or
replace as needed.
NO Proceed to next question.
Is rear wheel motor leakage 21% or more?
YES Repair or replace rear wheel motor. (See
“Rear Wheel Motor” on page 5-36.)
37. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
38. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Transmission Neutral Adjustment
Adjust Transmission Neutral (Creep)
See Figures 5-18 through 5-21.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-7.)
2. Raise the hood.
Prevent personal injury. Use properly rated lifting
devices. Always be sure load is balanced before
lifting.
Support the machine properly using jack stands.