HYDRAULICS
4203780 First Edition 6-35
6
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 front 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
front cutting unit right motor loaded flow.
10. Open flow meter valve (1), disengage switches, and
stop engine.
11. Calculate front cutting unit right motor leakage.
(Step 9 of front cutting unit deck valve tests – Step 9 /
Step 9 of front cutting unit deck valve tests x 100 =
Leak Percentage)
Is front cutting unit left motor leakage 10% or
less?
YES The front cutting unit left motor is good.
Proceed to step 12.
NO Proceed to next question.
Is front cutting unit left motor leakage 11% to
20%?
YES The front cutting unit left motor is marginal.
Additional testing is required. Proceed to
step 12.
NO Proceed to next question.
Is front cutting unit left motor leakage 21% or
more?
YES Repair or replace front cutting unit left motor.
(See “Deck Motors” on page 6-61.) Then
proceed to step 12.
12. Remove device or tool from front cutting unit left
motor.
!
WARNING
13. Install suitable blocking device or tool in front cutting
unit center motor, preventing front cutting unit center
motor from turning.
14. Open flow meter valve (1) completely.
Figure 6-28: Front Cutting Unit Motors Test—Center
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 front 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
front cutting unit center 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.
TN2074
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