Forklift maintenance procedures described a forklift hydraulic system 1. Check the hydraulic pumps, hydraulic valves, hydraulic cylinders and other components, at the rated working pressure, hydraulic pumps, hydraulic valves, hydraulic cylinders should be no leakage, no noise, overheating and other phenomena, the cylinder without creeping phenomenon. 2. Check the working pressure of the hydraulic system ① main clutch speed control system operating pressure is 3.92mpa, set pressure relief valve for 0.39mpa② steering clutch pressure control system for 0.98-1.19mpa, back to the oil pressure? Gearbox lubrication pressure 0.147mpa③ hydraulic system pressure is less than 13.73mpa. Ripper hydraulic circuit pressure is less than 15.7mpa. V. 1. Inspect the machine frame, exterior cover, cover, pedal, handrails and other structural parts. 3. Check the fastening bolts ministries, nuts, ministries bolts, nuts if loose and should be tightened, especially the engine, air cleaner, muffler, supporting wheels and track shoes, etc. bolts. 4. Check the machine painted surface conditions and, if necessary, locally up painting. Second, the forklift engine oil cooler cooler 1. overhaul core tube deformation or damage does not exceed 5% of all the tubes can be repaired. When more than 5%, should be replaced. After the restoration of core cooling should be conducted into the tank pressure test, shall not leak, the test pressure for 0.25-0.28mpa. 2. Check the thermostat execution cooler core tube deformation or damage does not exceed 5% of all the tubes by the lubrication requirements, can be repaired. When more than 5%, should be replaced. 3. Check the intake and exhaust valve repair should be placed after the cooling core tank pressure test conducted not leak, the test pressure for 0.25-0.28mpa thorough cleaning oil passages and oil pan, remove dirt thermostat function should normal. When the water temperature reaches 77 ℃, the thermostat valve should begin to open, reached 85 ℃, the valve should be fully open when not meet the above requirements, should be replaced with a valve seal vacuum test to check the tightness of the valve, when the vacuum gauge (mercury column) pointer over 50.3-84.7kPa Hg per 15-25inch high, the hand from the button is released, the shut-off valve is closed, when the pointer from 50.3kPa Hg per 15inch 12inch high mercury drops per 40.7kPa the time required when high column in 10s over qualified. 4. Wuhan forklift maintenance www.jhdcc.com check the cylinder head, cylinder head should be free of cracks, otherwise, should be repaired or replaced. After the restoration of the cylinder head should be pressure tested: ① When the hydrostatic test, the water temperature is 80-90 ℃, pressure for 0.25-0.60mpa, test 5min, not leaks. ② The pressure test should be the cylinder head into the sink, then 0.14-0.21mpa compressed air pressure should be no air leaks.