TM    10-3930-638-24&P 3-29.   HYDRAULIC   LIFT   SYSTEM   TROUBLESHOOTING   (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION 5. UNABLE TO TILT LOAD (ALL OTHER FUNCTIONS NORMAL) (cont) Step  4.  Crack  (loosen)  fittings  shown  at  side. Start engine and operate at idle speed. Place LIFT control lever in RAISE posi- tion until forks are three feet from ground. Place TILT control lever in FWD position and check if hydraulic oil flows from loosened fittings; place TILT control lever in REAR position and check if hydraulic oil flows from loosened fittings, a. If hydraulic oil does not flow from loosened  fittings,  replace  control  valve (para  3-30a). b. If hydraulic oil flows from fittings, proceed to step 5 (tighten fittings loosened  above). Step 5. Start engine and operate at idle speed. Place TILT control lever in FWD position until  mast  assembly  is  tilted  fully  forward. Turn engine off and operate control levers several times to relieve hydraulic pressure. Disconnect and cap hose fitting connected to rod end of tilt cylinder assembly. CAUTION Don’t place TILT control lever in REAR position in following steps. Hydraulic oil will flow out of disconnected hose fitting. Start engine and operate at idle speed. Place TILT control lever in FWD position and hold while an assistant checks for hydraulic oil leakage at tilt cylinder assembly port from which fitting was disconnected. Repeat the above for other tilt cylinder assembly. a. Remove tilt cylinder assembly and repair piston assembly (para 3-30b) if hydraulic oil leakage is  observed. b. If hydraulic oil leakage is not observed, remove and repair control valve (para 3-30a). 3-200