Textron Jacobsen AR-5 Technical/Repair Manual

5-22 4181383 First Edition
HYDROSTATIC POWER TRAIN
5
19. Start engine, release brake, and run at full throttle
(2850 rpm ± 50).
20. Adjust flow lock tool (3) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
21. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve 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); 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 15 gpm (57 lpm)
in the forward direction.
23. Slowly close flow meter valve until pressure reaches
2700 psi (186 bar). Read and record loaded flow.
24. Stop engine, apply brake, and return flow lock tool
back to neutral position.
25. Calculate left check valve leakage.
(Step 12 – Step 23 / Step 12 x 100 = Leak
Percentage)
Is left check valve leakage 10% or less?
YES The left check valve is good. Proceed to
Step 26.
NO Proceed to next question.
Is left check valve leakage 11% to 20%?
YES The left check valve is marginal. Additional
testing is required. Continue to step 26.
NO Proceed to next question.
Is left check valve leakage 21% or more?
YES Repair or replace left check valve. (See
“4WD Valve” on page 5-32.)
26. Remove blocking disk from location (4) of 4WD valve.
27. Install wheel restraint to left rear wheel.
28. Open flow meter valve completely before starting
engine.
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
29. Start engine, release brake, and run at full throttle
(2850 rpm ± 50).
30. Adjust flow lock tool (3) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
31. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve 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); open valve fully after
operating temperature is reached.
32. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 15 gpm (57 lpm)
in the forward direction.
33. Slowly close flow meter valve until pressure reaches
2700 psi (186 bar). Read and record loaded flow.
34. Stop engine, apply brake, and return flow lock tool
back to neutral position.
35. Calculate left rear wheel motor leakage.
(Step 23 – Step 33 / Step 23 x 100 = Leak
Percentage)
Is left rear wheel motor leakage 10% or less?
YES The left rear wheel motor is good. Proceed to
step 36.
NO Proceed to next question.
Is left rear wheel motor leakage 11% to 20%?
YES The left rear wheel motor is marginal.
Additional testing is required. Continue to
step 36.
NO Proceed to next question.
Is left rear wheel motor leakage 21% or more?
YES Repair or replace left rear wheel motor. (See
“Rear Wheel Motor” on page 5-39.)
Figure 5-22
36. Remove blocking disk from location (1).
37. Install blocking disk at location (5), in front of front
axle, to block oil from left wheel motor.
IMPORTANT
• If performing this test after performing the
traction system test, and the test results have
proven the traction system to be good, proceed
to step 49.
• If performing this test to determine which
component in system is at fault (front wheel
motor, check valve, or rear wheel motor) continue
to step 38.
38. Install wheel restraint to right front wheel.
5
TN1400
1

Textron Jacobsen AR-5 Specifications

General

Brand	Textron
Model	Jacobsen AR-5
Category	Lawn Mower
Language	English