Five Mechanical Faults of Diesel Forklifts and Their Solutions

1. To ensure the service life of mechanical equipment components and sealing elements in the hydraulic control circuit of the system, the normal working pressure of the control circuit should be 1.1–1.4 MPa. 2. Forklifts with automatic transmission should use 6# hydraulic transmission oil and a corrugated oil tank; vehicles with manual transmission should use gear oil. The operating oil temperature should be between 70–95°C, and prolonged use above 95°C is not permitted. 3. Cleaning and maintenance of automatic transmissions: Generally, the lubricating oil in forklift gearboxes should be replaced every six months for cleaning and maintenance purposes. 4. Regarding the replacement and cleaning intervals for forklift oil filters: A new forklift should have its first replacement within 50 hours, followed by replacements every 200 hours and every 1,200 hours; under harsh environmental conditions, replacement is also required every 600 hours. 5. When shifting gears on a forklift, the micro valve should be closed first before shifting; when braking, the micro valve must be closed first before braking. This prevents clutch damage or brake failure.