HYDRAULICS
4203781 First Edition 6-53
6
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
6. Start engine and run at full throttle (2800 rpm ± 50).
7. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (1) until a reading of 1500 psi (103
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.
8. Enable wing mower deck switch and engage PTO
switch.
9. Slowly close flow meter valve (1) until pressure
reaches 2250 psi (155 bar). Read and record the left
wing cutting unit inside motor loaded flow.
10. Open flow meter valve (1), disengage switches, and
stop engine.
11. Calculate left wing cutting unit inside motor leakage.
(Step 9 of left wing cutting unit deck valve test –
Step 9 / Step 9 of left wing cutting unit deck valve test
x 100 = Leak Percentage)
Is left wing cutting unit inside motor leakage 10%
or less?
YES The left wing cutting unit inside motor is
good. Proceed to step 12.
NO Proceed to next question.
Is left wing cutting unit inside motor leakage 11%
to 20%?
YES The left wing cutting unit inside motor is
marginal. Additional testing is required.
Proceed to step 12.
NO Proceed to next question.
Is left wing cutting unit inside motor leakage 21%
or more?
YES Repair or replace left wing cutting unit inside
motor. (See “Deck Motors” on page 6-62.)
Then proceed to step 12.
12. Remove device or tool from left wing cutting unit
inside motor.
!
WARNING
13. Install suitable blocking device or tool in left cutting
unit outside motor, preventing left cutting unit outside
motor from turning.
14. Open flow meter valve (1) completely.
Figure 6-55: Left Wing Cutting Unit Motors Test—
Outside Cutting Unit Motor Blocked
15. Bypass seat switch and set park brake.
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
16. Start engine and run at full throttle (2800 rpm ± 50).
17. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (1) until a reading of 1500 psi (103
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. Enable wing mower deck switch and engage PTO
switch.
19. Slowly close flow meter valve (1) until pressure
reaches 2250 psi (155 bar). Read and record the left
cutting unit outside motor loaded flow.
20. Open flow meter valve (1), disengage switches, and
stop engine.
Safely block cutting unit from rotating using a
suitable device or tool. Failure to follow
appropriate safety precaution may result in death
or serious injury.
TN2253
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