TM  10-3930-638-24&P 3-29.   HYDRAULIC   LIFT   SYSTEM   TROUBLESHOOTING   (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE ACTION 1. UNABLE TO LIFT A LOAD (ALL OTHER FUNCTIONS NORMAL) (cont) Step  1. Start engine and operate at idle speed. NOTE Increase engine speed as necessary in following steps to prevent engine stall. With no load on forks, place LIFT control lever in RAISE  position  until  tube  assembly  shown  is  warm to touch (mast assembly will be at full height). WARNING Don’t look directly down at fitting when per- forming following steps; hydraulic oil is under pressure.  Serious  injury  may  result. Loosen bleed fitting at top of lift cylinder assembly. Step  2. While an assistant places LIFT control lever in RAISE position, observe fitting at top of lift cylinder assembly for hydraulic oil leakage. (Slight weeping of oil is permissible.) a. If hydraulic oil leakage (other than slight weeping) is observed, remove lift cylinder assembly (para  3-30e)  and  check  piston  assembly  and  wear  rings  (para  3-30e);  repair/replace  as  necessary. b. If hydraulic oil leakage is not observed, tighten bleed fitting and proceed to step 2. With  engine  operating  at  idle  speed  and  LIFT  control  lever  in  RAISE  position  (mast  assembly  will  be at full height), check for hydraulic oil leakage at end cap assembly (located at top of lift cylinder assembly) and at gland assembly (located at top of lift cylinder body). NOTE Increase engine speed as necessary to prevent engine stall. a. If hydraulic oil leakage is observed, remove lift cylinder assembly (para 3-30e), and repair or replace  gland  assembly  or  end  cap  assembly  (para  3-30e). b. If hydraulic oil leakage is not observed, proceed to step 3. 3-195