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PTO principle and troubleshooting

Nov 26, 2019

PTO principle and troubleshooting


A power take-off is a group of variable-speed gears, also known as a power take-off.It is generally composed of a gear box and a clutch. It is connected to the gearbox using gears, and is connected to the lift pump by a shaft. It is a separate gear in the gearbox. Position, put this gear in place, as soon as the accelerator is added, the lift pump can run. The power take-off is usually connected to the drive shaft or directly connected to the gear pump. In China, it is usually connected to the drive shaft.

PTO failure phenomenon

When the power take-off of a heavy vehicle fails, the most direct and obvious result is that the gear pump does not rotate, the hydraulic dumping system loses its power source, and the entire system is in a paralyzed state. The reasons for the inability to work may be: Blocked; ③ The solenoid valve is malfunctioning.

First observe the index on the barometer. If the air pressure is lower than the working pressure, increase the throttle to increase the air pressure; if the air pressure is normal, you must find whether the air pipe before and after the solenoid valve is plugged in the rainy season, and whether the pipe is leaking, causing power Insufficient air volume in the cylinder. Check whether the solenoid valve is safe and reliable. If the fault is not eliminated, remove the power take-off cylinder, remove the piston rod, replace the piston or "O" seal ring, and remove the dirt on the inner wall of the cylinder barrel.

When the lifting operation is completed, the power take-off switch is turned off, and the power take-off drive shaft continues to rotate to make the hydraulic pump work. Generally, there are the following reasons:

1. Pressing the fork nut loose;

2. The screws on the piston rod are loose;

3. The spring and performance of the power take-off piston rod is weakened or damaged.





The first step is to check whether the nut pressing the fork is falling off. If the nut is falling off, remove the power take-off cylinder seat, replace it with a new lock plate, and tighten the nut. If the fork is fastened to the piston rod intact, remove the power cylinder back cover and check whether the screw on the piston rod is loose. If the screws come loose, re-tighten and put on the split pin. The above two items are intact and no damage. Push the piston rod by hand. If you feel something abnormal and prove that it is damaged, you must remove the cylinder seat and replace with a new spring.