Method of air removal in hydraulic system:
1) Inject the recommended hydraulic oil to the oil level specified on the scale, and lift the oil cylinder when filling.
2) Make the load of the forklift reach 1/10-1/8 of the rated load, loosen the vent plug on the lifting cylinder, and then
Lift and drop the fork several times until there are no bubbles at the vent plug, and then tighten the vent plug.
3) Tilt the inclined cylinder forward and backward to the door frame two maximum times to eliminate the air in the inclined cylinder.
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Troubleshooting |
Causes |
Method of solving fault |
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It can’t lift and tilt without load. |
The oil supply is insufficient |
Fill fuel to the oil line |
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Gear pump displacement is insufficient crest clearance and tooth clearance is too large. |
Replace the oil pump or parts |
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Multi - way reversing valve oil road blockage |
Dredge oil road |
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Slow lifting cylinder plunger action, lifting frame discontinuity or impact |
There is not enough oil in the system |
Fill the tank |
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Sealing is not good, the oil pipe connection is not tight, resulting in oil leakage, oil pipe rupture seal. |
Tighten the pipe joint, replace the oil pipe. |
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Oil supply is insufficient |
Repair or replace the oil pump |
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Safety valve improperly adjusted or damaged |
adjust or repair safety valve |
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Hydraulic filter clogs |
Cleaning filter |
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There is air in the hydraulic system |
Push the air out |
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Fork frame down, the speed is too fast |
one-way throttle valve stuck in the open position or was installed wrong direction |
Anti-decomposition one-way throttle valve |
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The sliding amount of the lifting cylinder is too large, the inclination Angle of the inclined cylinder is too large, |
the leakage in the valve stem of the reversing valve is too large, and the sealing ring of the piston of the inclined cylinder fails, and the internal leakage is too large. |
Replace the original valve stem or replace the sealing ring |
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There is oil on the piston rod |
The oil seal is damaged. |
Replace the oil seal |
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Hydraulic system noise (cylinder movement is not smooth) |
The suction hose folds or clogs |
Clean the oil hose |
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There is air in the system |
Remove the air from the system through vents |
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Gear pump bearing is worn |
Replace the bearing |
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Gear pump side plate is worn |
Replace the side plate |
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Oil cylinder is split |
Filter and safety valve dirty, blocked, resulting in increased oil pressure, so that the oil pipe split |
Clean the paper core and safety valve |
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Tilt cylinder is out of sync |
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Adjust the tilting cylinder piston rod so that the threaded depth of the end exceeds the observation hole on the earring to make the connection firm adjust the piston rod to synchronize the movement of the two cylinders |