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TM 10-3930-659-20
17-4.
HYDRAULIC CYLINDER DRIFT/LEAKAGE TESTS.
This Task Covers:
a.
Carriage Tilt Cylinder Drift/Leakage Test
b.
Fork/Boom Cylinder Drift/Leakage Test
Initial Setup:
Equipment Conditions:
Materials/Parts:
•
Parking brake set (see TM 10-3930-659-10).
• Masking tape (Item 37, Appendix C)
•
Hydraulic system warmed to operating temperature
(see paragraph 2-29).
References:
• TM 10-3930-659-10
Tools/Test Equipment:
•
General mechanic's tool kit (Item 44, Appendix F)
•
Trestle, 7 ton (two) (Item 45, Appendix F)
a.
CARRIAGE TILT CYLINDER DRIFT/LEAKAGE TEST
1.
Start engine (see TM 10-3930-659-10).
2.
Park forklift truck on a firm surface and raise carriage assembly (5) 1 ft (31 cm) above ground.
3.
Shut down engine (see TM 10-3930-659-10).
4.
Attach masking tape (2) to rod (1) exactly 2 in. (5 cm) in front of carriage tilt cylinder (3).
5.
Wait one minute and measure distance between masking tape (2) and carriage tilt cylinder (3). Distance change
must be less than 0.27 In. (7 mm). If measurement is within specification, check is complete and tape can be
removed. If measurement is not within specification, continue with test.
TA707618
17-13
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