HYDRAULICS
673831-Rev A 6-41
6
Figure 6-40: Rear Reel Motors Test—Right Rear Reel
Motor Blocked
Verify engine rpm is within specification (3000 rpm ± 50)
to ensure accurate hydraulic test results.
7. Start engine and run at full throttle (3000 rpm ± 50).
8. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (1) until a reading of 1100 psi
(75 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.
9. Engage the mow switch, engage and release the
lift/lower joystick to the lower position twice, and
operate the reels.
10. Slowly close flow meter valve (1) until a pressure of
1650 psi (114 bar) or 75% of the relief valve rating is
reached. Read and record the right rear reel motor
loaded flow.
11. Open flow meter valve, disengage mow switch, and
stop engine.
12. Calculate right rear reel motor leakage.
(Step 10 of rear reel valve test – Step 10 / Step 10 of
rear reel valve test x 100 = Leak Percentage)
Is right rear reel motor leakage 10% or less?
YES The right rear reel motor is good. Proceed to
step 13.
NO Proceed to next question.
Is right rear reel motor leakage 11% to 20%?
YES The right rear reel motor is marginal.
Additional testing is required. Proceed to
step 13.
NO Proceed to next question.
Is right rear reel motor leakage 21% or more?
YES Repair or replace right rear reel motor. See
“Reel Drive Motor” on page 8-24, then
proceed to step 13.
13. Remove blocking device or tool from right rear reel
motor.
14. Install suitable blocking device or tool in left rear
cutting unit, preventing left rear reel motor from
turning.
15. Open flow meter valve completely.
Figure 6-41: Rear Reel Motors Test—Left Rear Reel
Motor Blocked
Verify engine rpm is within specification (3000 rpm ± 50)
to ensure accurate hydraulic test results.
16. Start engine and run at full throttle (3000 rpm ± 50).
17. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve until a reading of 1100 psi (75 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. Engage the mow switch, engage and release the
lift/lower joystick to the lower position twice, and
operate the reels.
19. Slowly close flow meter valve until a pressure of
1650 psi (114 bar) or 75% of the relief valve rating is
reached. Read and record the left rear reel motor
loaded flow.
20. Open flow meter valve, disengage mow switch, and
stop engine.
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.
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