High-altitude truck common faults and troubleshooting high speed rolling shutter door servo motor
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Fault 1: The hydraulic system can not reach the required working pressure, increase the engine throttle. Phenomenon: Can't get into the leg, the boom can't get up and the turntable doesn't move. From the pressure gauge, the pressure of various institutions is very low.
Willingness due to: (1) Overpressure valve opening pressure is too low. (2) The oil level in the tank is too low, or the suction pipe is blocked. (3) Excessive collusion or leakage of the pressure line and return line causes a large amount of oil to flow back to the tank without taking part in the work. (4) The oil pump is damaged or leaked too much.
Remedy: (1) Adjust the relief valve opening pressure (2) Add new oil or check the suction pipe (3) Check the oil line, especially various valve locks, motors, etc. (4) Check the oil pump for maintenance, or replace with new one.
Fault 2: Caused by gear failure: (1) Lever failure (2) Lever damage (3) Latching spring failure Solution: Or repair or change failure 3: Oil leakage in hydraulic system Causes: (1) Loose joint (2) Damaged seal (3) Cracked pipe or welded pipe Fitting oil sand hole removal method: (1) Tightening (2) Renewal (3) Repair welding or renewing fault 4: Throttle control valve does not work Cause: (1) The wire rope is stuck in the system (2) The spring is damaged (3) The stroke is changed due to the looseness of the rope card (4) The lack of lubricating oil Method: (1) Overhaul (2) Renew (3) Adjust stroke; Tighten (4) Lubricate each P bit Fault 5: Pressure meter oil is not indicated, or pressure does not rise Cause: (1) The tank fluid level is too low or the suction pipe is blocked (2) The relief valve adjusts pressure Low (3) The edge of the oil pump before the oil inlet is not sealed (4) The oil pump is damaged or the internal leakage is serious. (5) The pressure piping or return piping is contaminated or the leakage is too large. (6) Damage to the pressure gauge. Remedy: (1) Fill and remove foreign material (2) Press Specified to properly adjust the pressure (3) Exclude from leaks (4) Repair or renew (5) or repair or replacement (6) Or repair or replace fault 6: Oil noise Caused by vibration: (1) Air in the pipeline (2) Component failure (3) ⑷ side fastening element does not change the oil too fast too fast too low to ⑸ ⑹ ⑺ insufficient oil pipe plug Remedy: ⑴ agencies repeated operation, exclude internal gas pump maintenance. (2) Repair or change (3) Fastening and adding the tube card (4) Slow operation (5) No-load operation heating (6) Oil injection (7) Dredge failure 7: Oil temperature overheating Causes: (1) Excessive internal leakage (2) High pressure (3) Long continuous operation time and high ambient temperature ( summer)
Remedy: (1) Repair components (2) Adjust pressure (3) Shut down, rest and cool before working.
Fault 8: The cylinder and motor do not move in a uniform manner and there are climbing reasons: (1) The air system in the hydraulic system is significantly compressed after being loaded with air, making the movement uneven. (2) Lack of lubrication between moving friction surfaces. (3) The clearance between the moving parts and the non-parts is too small, or the moving working parts are deformed.
Remedy: (1) Fill the tank with oil and reciprocate the cylinders at full speed for several times. (2) often add butter and lubricate. (3) Check that the clearance between the moving parts is moderately tight.
Fault 9: Leg movement is slow, retraction is not working or even causes: (1) Relief valve failure or pressure is too low. (2) Oil leakage in the cylinder, damage to the oil seal reduces the volumetric efficiency of the cylinder, insufficient displacement of the oil pump, failure of the reversing valve, or serious internal leakage. (3) There is foreign material or scratches between the tapered surface of the slide valve and the valve seat contact line in the bidirectional hydraulic lock. (4) There is air in the cylinder.
Remedy: (1) Repair, replacement or pressure adjustment. (2) Replace the oil seal, pump displacement is insufficient, do not increase the throttle, increase engine speed, valve failure, light repair, heavy change. (3) Open the cleaning, replace the weight, and re-distribution (4) reciprocate several times to eliminate the air.
Fault 10: Rotary table does not move Causes: (1) Relief valve overflow pressure is too low or completely out of order (2) Oil pump or rotary motor is not working (3) Pinion gear is not meshed well with tooth circle (4) Worm gear box is not working (5) Failure of reversing valve is eliminated : (1) Overhaul or adjustment (2) or repair or replacement (3) Adjustment according to regulations (4) or correction or replacement (5) Inspection or replacement fault 11: The working arm does not rise Causes: (1) Relief pressure of overflow valve is too low (2) The pipeline is blocked and oil is blocked (3) Cylinder Severe internal leakage (4) Reversing valve failure elimination method: (1) pressure regulator (2) paragraph by paragraph inspection, in addition to stolen goods, rotating oil pump mechanism does not operate, one by one to loosen the joint to check whether the oil injection, can detect the specific location of the pipe was blocked. (3) Replace the oil seal (4) Repair or replace the fault 12: The working arm does not fall Causes: (1) The control pressure in the balance valve is too high (2) The pipeline is blocked, the oil does not pass (3) The reversing valve malfunctions Troubleshooting method: (1) Adjust the balance valve pressure (2) Press the working arm not Rising and Exclude (3) Overhaul or Replacement Fault 13: Vibrating under Falling Arm Cause: (1) There is air in the cylinder (2) The speed limit valve is not properly adjusted. Remedy: (1) Air is removed according to the maintenance method (2) Re-adjustment failure 14: The cylinder cannot be locked. : (1) Counterbalance valve cone and seat oil seal cover scratches or foreign matter (2) Counterbalance valve spring breakage stuck (3) Connector oil leakage (4) Cylinder internal leakage elimination method: (1) repair or change (2) repair or change (3) tighten (4) repair or change fault 15: Cylinder piston rod extends out of oil Cause: (1) The seal ring is damaged. (2) The piston rod is scratched. Removal method: (1) Replace the oil seal (2) Repair or replace, remove foreign matter.
Fault 16: Inadequate flow rate Causes: (1) Engine speed is too low (2) Oil pump wear is severely eliminated. Remedy: (1) Appropriate acceleration (2) Repair or change of fault 17: Cause of noise: (1) Loose suction pipe connector sucks in air (2) The viscosity of the oil is too high (3) High speed (4) Air in tank and oil system (5) Connection of pump shaft and power take-off box gearbox Concentricity (6) Poor quality of pump, uneven movement, oil trapped phenomenon is not well eliminated or plunger stuck All will make noise. (7) Tube edges or components are not well fastened and the tube card is loose. (8) The oil temperature is too low.
Remedy: (1) Tighten the fittings (2) Change the specified oil (3) Decrease the speed (4) Exclude air (5) Re-install adjustment (6) Clean and inspect (7) Tighten the components and the pipe clamp (8) Run the system at low speed to warm the system.
Fault 18: The work bucket is not perpendicular to the bottom. Cause: The work pin is not fully lubricated at the pin axis of the work bucket, at the balance shaft, and at the swing shaft.
Remedy: Lubrication