TM 9-2350 -238-34-2Table 2-1. DIRECT SUPPORT TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION16. BOOM RAISES BUT WILL NOT LOWER.Step 1.Check adjustment of pressure relief valve. Refer to page 2-163.If pressure relief valve cannot be adjusted, replace or repairpressure relief valve. Refer to page 2-154.Step 2.Check for damaged check valve.17. BOOM LOWERS BUTReplace or repair damaged boom cylinder check valve. Refer topage 2-154.WILL NOT RAISE.Close boom cylinder hydraulic stop-check valve at counterbalance manifold.If boom still will not raise, replace boom cylinder hydraulic stop-c h e c k v a l v e . R e f e r t o p a g e 2 - 1 5 4 . 18. BOOM OPERATES SLUGGISHLY WHEN RAISING AND LOWERING.Step 1.Check for leaks and damaged or clogged hydraulic linesTighten all loose connections. Replace damagedand hoses, Refer to TM 9-2350-238-20-2.and hoses.hydraulic linesStep 2. Check boom winch control cylinders for damage and leaks.Replace or repair damaged or leaking boom winch controlcylinders. Refer to page 2-84.19. BOOM OPERATES SLUGGISHLY IN RAISING.Check adjustment of boom cylinder pressure relief valve. Refer to page 2-179.If boom cylinder pressure relief valve cannot be adjusted,replace or repair boom cylinder pressure relief valve. Refer topage 2-154.2-11
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