HYDRAULICS
4203780 First Edition 6-25
6
Wing Lift Cylinders Leakage Test
See Figure 6-15.
!
WARNING
1. Start engine. Operate hydraulic system until oil
temperature is at 120—150° F (49—65° C).
2. Raise the wing cutting unit one foot off the ground.
3. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
4. Support the wing cutting unit to be tested.
.
Figure 6-15
NOTE
Figure 6-15 shows left wing lift cylinder. Procedure is
similar for right wing lift cylinder.
5. Disconnect hose (2) from lift cylinder piston end
fitting (1).
6. Install plug in hose (2).
7. Install cap on lift cylinder fitting (1).
8. Remove support from wing cutting unit.
After 15 minutes, does cutting unit drift down?
YES Cylinder is bypassing oil. Replace lift
cylinder. (See “Wing Lift Cylinders” on
page 6-73.)
NO Repeat the test for all of the lift cylinders. If
all cylinders pass test, the problem may be in
the lift valve. Proceed to step 9.
9. Support wing cutting unit.
10. Connect hose (2) to lift cylinder fitting (1).
11. Start the engine and lower cutting units.
12. Stop the engine.
The hydraulic system is under pressure, and the
oil will be hot.
• Always relieve pressure in the hydraulic
system before performing service.
• Failure to follow appropriate safety
precautions may result in death or serious
injury.
TN1797
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