The malfunction of hydraulic forklifts may be caused by hydraulic systems, electrical systems, mechanical components, or operational issues, and should be gradually investigated based on specific fault symptoms. The following are common faults and their solutions:

1、 Hydraulic system malfunction

Trembling or unable to lift

Reason for malfunction: There is air in the hydraulic cylinder, oil leakage in the hydraulic system, lack of oil in the oil tank, clogged oil filter, insufficient pressure in the relief valve, worn oil pump, worn solenoid valve or one-way valve, etc.

resolvent:

Lift and exhaust multiple times with heavy load.

Repair or replace leaking components.

Add or replace hydraulic oil.

Clean the oil filter or hydraulic oil valve circuit.

Adjust the pressure of the overflow valve again.

Replace worn oil pumps, solenoid valves, check valves, or seals.

Fork self lowering

Reason for malfunction: Oil leakage in pipeline or oil circuit joints, dirt jamming in solenoid valves or check valves, or worn sealing rings.

resolvent:

Replace the seal.

Clean the valve assembly and replace the seals.

Slow lifting speed or inability to lift

Reason for malfunction: In addition to the hydraulic system malfunction mentioned above, it may also be caused by loose control switch micro switches, loose DC contactor wiring, etc.

resolvent:

Tighten the wiring of the control switch or DC contactor.

Refer to the previous hydraulic system troubleshooting method for handling.

2、 Electrical system malfunction

Forklift cannot start (contactor not working)

Fault causes: burnt out control circuit fuse, poor or damaged contact of power switch, blown main circuit fuse of electrical system, loose or detached battery connection.

resolvent:

Replace the fuse.

Repair or replace the power switch.

Replace the main circuit fuse.

Tighten the battery connection.

Forklift cannot move (contactor works but vehicle does not move)

Reason for malfunction: The magnetic brake near the driving wheel is not engaged, the carbon brush of the walking motor is worn or the commutator is in poor contact, the excitation coil of the walking motor is disconnected or the wire end is in poor contact.

resolvent:

Repair or replace the brake.

Repair or replace carbon brushes or commutators.

Repair or replace the excitation coil.

3、 Mechanical component failure

Abnormal noise generated by the walking drive wheel

Reason for malfunction: Hard debris mixed in the lubricating oil, excessive wear or damage to the bearings.

resolvent:

Replace the lubricating oil.

Replace the bearings.

Forks do not rise or fall

Reason for malfunction: Impurities in hydraulic oil, pressure relief valve not adjusted properly, deformation of cylinder piston rod due to unbalanced load, damage or deformation of parts.

resolvent:

Replace sanitary hydraulic oil.

Adjust the tightening screw.

Replace the piston rod or oil cylinder.

Repair or replace associated parts.

4、 Operational issues

Improper operation leading to malfunction

Reason for malfunction: rough operation, overload, unbalanced load, etc.

resolvent:

Work gently to avoid impact loads.

Strictly abide by the load regulations, do not overload or overload.

5、 Daily maintenance and upkeep suggestions

Regularly check hydraulic oil

Inspection content: Quality and quantity of hydraulic oil.

Replacement cycle: Replace the hydraulic oil every 6 months, while ensuring sufficient oil in the tank.

Attention: Choose the same type of oil as the original pressurized oil.

Clean the radiator

Function: Ensure the normal operation of the engine.

Cleaning method: Use specialized cleaning agents and a soft cloth to wipe the surface of the radiator.

Check the tire wear condition

Inspection content: tire tread depth and air pressure.

Replacement standard: Replace when the tire tread depth is less than 1.6 millimeters.

Attention: Ensure that the tire pressure is within the normal range.

Adjust brake pads

Inspection content: Thickness of brake pads.

Replacement standard: Replace brake pads when the thickness is less than 5 millimeters.

Attention: Choose a product with the same material as the original brake pads.

Check the electrical system

Inspection content: Check whether the connection parts of the electrical system are fastened and whether there is any damage to the wires.

Solution: Timely repair or replace damaged parts.

Maintain joint connectors

Maintenance content: Regularly check the wear of joint connectors and apply lubricating grease.

Function: Reduce friction loss and extend service life.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment