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S e c t i o n X . H Y D R A U L I C L I F T S Y S T E M M A I N T E N A N CE
TM 10-3930-638-24&P
This section contains the information you’ll need to maintain the
hydraulic lift system. It gives you instructions on how to troubleshoot
problems, and repair or replace components that are within the scope
of organizational maintenance.
Para
Para
Troubleshooting Symptom Index . . . . . . . . . . . 2-54
Lifting Forks . . . . . . . . . . . . . . . . . . . . . . . 2-56c
Hydraulic Lift System Troubleshooting . . . . . . . .2-55
Lift Chains and Pulley s . . . . . . . . . . . . . . . . . 2-56d
Hydraulic Lift System Maintenance . . . . . . 2-56
Sideshift Chains and Pulleys . . . . . . . . . . . . . 2-56e
Operational Test . . . . . . . . . . . . . . . . . . . . . 2-56a
Hoses, Lines and Fittings . . . . . . . . . . . . . . . 2-56f
Control Levers and Linkages . . . . . . . . . . . 2-56b
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . 2-56g
2-54. TROUBLESHOOTING SYMPTOM INDEX]
NOTE
A hydraulic system schematic is located at the back of this manual
in appendix F.
Para/Malfunction Page
HYDRAULIC LIFT SYSTEM
2-55/1
3-289
Load lowers too fast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-55/2
3-290
Load creeps downward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unable to lift, tilt, shift, or rotate load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-55/3
3-290
Lift, tilt, shift, or rotate too slow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-55/4
3-291
2-55/5
3-291
Load creeps while tilting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-55. HYDRAULIC LIFT SYSTEM TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Also refer to paragraph 2-56a, operational test, for additional
troubleshooting data.
1. LOAD LOWERS TOO FAST
Step 1. Check hoses, lines and fittings between control valve and lift cylinder assembly for oil leaks.
a. If oil leakage is observed, tighten fittings; if hoses or lines are damaged, replace (para 2-56 f(l)).
b. If oil leakage is not observed, proceed to step 2.
2-389
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