About forklift gearbox
Since the engine cannot be reversed, the forward and reverse movements of the forklift are handled by the transmission. The main function of the gearbox is to adapt the vehicle to start under various road conditions, accelerate uphill, and drive at high speed on flat roads. The gearbox converts the torque and vehicle speed output by the engine to adapt to the driving requirements. In addition, the gearbox can also cut off the operation of the engine and the drive system from each other for a long time. When shifting gears or changing gears, you should relax the accelerator pedal (throttle) and wait for the oil to drain away, then step on the clutch pedal, quickly and correctly push or pull into the gear you want to shift into, and then release the clutch. When changing gears, do not push or pull hard to cause the gears to make a knocking sound.
Characteristics of hydraulic torque converters and gearboxes:
(1) The hydraulic transmission gearbox used in 1.5T to 3T forklifts is composed of a hydraulic torque converter and a power shift gearbox with one gear in the front and one in the rear. The installed torque converter is a single-stage, two-phase, three-wheel integrated hydraulic torque converter. The hydraulic torque converter enables the hydraulic transmission gearbox to have automatic adaptability to the hydraulic transmission output. It can change its output torque and speed accordingly as the external load changes, and it can absorb and eliminate the impact of the engine and external load on the transmission. shock and vibration in the system. The hydraulic transmission gearbox outputs differential side gears. The gear shifting method used is power shifting with micro valves and buffer valves, which makes operation simple and convenient, starts smoothly, and greatly reduces the operator's labor intensity.
(2) The hydraulic transmission gearbox hydraulic torque converter used in 5-ton - 6-ton forklifts is a single-stage, three-phase, four-wheel comprehensive hydraulic torque converter, which has a large torque conversion ratio, high efficiency, and a wide range of efficiency. It has the characteristics of simple structure and easy maintenance. It has two gears, forward and reverse, with soft and stable operation and micro-movement characteristics.

How to maintain the forklift gearbox?
(1) In order to ensure the service life of the mechanical components and sealing elements of the hydraulic control oil circuit, the normal pressure of the control oil circuit is 1.1/u1.4Mpa
(2) The working oil is 20# turbine oil (or 6# hydraulic transmission oil) or turbine oil. The operating oil temperature is 70-95~C. If it is greater than 95cC, the use time cannot be too long.
(3) When the forklift is driving and changing gears, the inching valve should be closed first before shifting gears; when braking, the inching valve must be closed before braking to prevent clutch damage or brake failure.
(4) The replacement and cleaning cycle of the oil filter should be within 50 hours for new vehicles, every 200 hours, 1200 hours thereafter, and every 600 hours for special environments.