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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