I. Transmission System

1. Excessive Noise

a. Gear or bearing damage, or worn involute bolt grooves on the gears. Solution: Replace the gears or bearings.

b. Insufficient lubricating oil or oil quality. Solution: Add or replace gear oil.

2. Oil Leakage

Cause: Damaged oil seal or gasket. Solution: Replace the oil seal or gasket.

II. Power Steering System

1. Steering Failure

a. Oil level too low or no oil. Solution: Add hydraulic oil.

b. Loose steering control valve oil pipe joint. Solution: Retighten.

2. Slow steering, difficult steering wheel rotation.

a. Oil level too low or no oil. Solution: Add hydraulic oil.

b. Damaged oil pipe. Solution: Replace with a new one.

c. Worn steering valve or pump parts. Solution: Replace with a new one.

3. The wheels continue to turn after the steering wheel stops.

Damaged steering valve. Solution: Replace with a new one.

4. Excessive play

Excessive accumulated play (including backlash). Solution: Adjust or replace.

III. Chain and Fork

The load's center of gravity is correctly positioned, but the load is unstable during lift.

a. Improper chain tension. Solution: Adjust the chain.

b. Fork slack. Solution: Secure the fork.

IV. Electrical System

1. The electrical system is not functioning.

a. Poor power cord connection. Solution: Check and correct.

b. Faulty battery connector. Solution: Replace the connector.

2. The light does not illuminate.

a. Poor power cord connection. Solution: Check and correct.

b. Faulty light switch. Solution: Replace the switch.

c. Light fuse is blown. Solution: Replace the fuse.

d. Light bulb is burnt. Solution: Replace the light bulb.

3. The horn does not sound.

a. Poor power cord connection. Solution: Check and correct.

b. Faulty fuse. Solution: Replace the fuse.

c. Faulty switch. Solution: Replace the switch.

d. Faulty horn. Solution: Replace the speaker.

4. Battery indicator is not working.

a. Poor power cord connection. Solution: Check and correct.

b. Blown fuse. Solution: Replace the fuse.

c. Damaged key switch. Solution: Replace the key switch.

d. Damaged battery indicator. Solution: Replace the battery indicator.

5. Pump motor is not working.

a. Poor power cord connection. Solution: Check and correct.

b. Blown fuse. Solution: Replace the fuse.

c. Faulty pump contactor. Solution: Replace the pump contactor.

d. Faulty pump motor. Solution: Inspect and repair the motor. Common types of electric stackers.