TM 10-3930-669-20 2-18.  HYDRAULIC SYSTEM TROUBLESHOOTING (CONT). 9.  LIFT CYLINDER(S) WILL NOT HOLD LOAD (DOWNDRIFT). INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) References TM 10-3930-669-10 Equipment Condition Engine OFF (TM 10-3930-669-10) MAIN POWER switch OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) KNOWN INFO TEST OPTIONS Nothing. Visual inspection. POSSIBLE PROBLEMS REASON FOR QUESTION Lift cylinder hose(s) leaking or damaged. Lilt cylinders faulty. Lift control cable damaged or unadjusted. Stack valve faulty. Hydraulic reservoir return hose leaking or damaged. If lift cylinder hose(s) is faulty, lift cylinder will not hold load. 2-474 ¬