Textron JACOBSEN GP400, Technical/Repair Manual

Page: 230 / 354

6-38 4252490-Rev A
HYDRAULICS
6
Figure 6-33: Reel Motors Test—Left Reel Motor
Blocked
NOTE
Verify engine rpm is within specification (3400 rpm ± 50)
to ensure accurate hydraulic test results.
16. Start engine and run at full throttle (3400 rpm ± 50).
17. Use the flow meter to warm the hydraulic oil. Turn
flow meter valve until a reading of 1500 psi (103 bar)
or 50% 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. Engage mow switch.
19. Slowly close flow meter valve until pressure reaches
2200 psi (152 bar) or 75% of the relief valve rating is
reached. Read and record the left reel motor loaded
flow.
20. Open flow meter valve, disengage mow switch, and
stop engine.
21. Calculate left reel motor leakage.
(Step 10 – Step 19 / Step 10 x 100 = Leak
Percentage)
Is left reel motor leakage 10% or less?
YES The left reel motor is good. Proceed to
step 22.
NO Proceed to next question.
Is left reel motor leakage 11–20%?
YES The left reel motor is marginal. Additional
testing is required. Proceed to step 22.
NO Proceed to next question.
Is left reel motor leakage 21% or more?
YES Repair or replace left reel motor. See “Reel
Motors” on page 6-59, then proceed to
step 22.
22. Remove blocking device or tool from left cutting unit.
!
WARNING
23. Install suitable blocking device or tool in center
cutting unit, preventing center reel motor from
turning.
24. Open flow meter valve completely.
Figure 6-34: Reel Motors Test—Center Reel Motor
Blocked
TN3100
Safely block cutting unit from rotating using a
suitable device or tool. Failure to follow
appropriate safety precautions may result in
death or serious injury.
TN3101