Five maintenance methods for cold heading machine:

1. When the loader lifts the brake pedal after braking, all or some wheels still have braking effect, resulting in brake disc heating and driving weakness, commonly known as "brake does not return". Regularly check the connection and fastening of all parts of the brake.

2. The cold pier machine has been used for a long time, and there will be oil dirt, carbon deposit, sediment and rust inside. When the brake pedal is depressed, the position is very low. When the pedal is depressed continuously, the pedal can gradually rise, but the reaction force is small and the braking effect is poor, indicating that there is air in the brake oil pipe or brake cylinder, which should be eliminated. When the brake pedal is depressed, the air pressure is normal but the brake pedal does not move, indicating that the brake control valve piston is stuck.

3. Disassemble the brake valve, repair or replace it. The piston of the booster cylinder is stuck or the sealing ring is damaged, and the output brake fluid oil and pressure are reduced. The brake oil pipe is broken or the oil pipe joint leaks oil, reducing the amount and pressure of brake fluid entering the brake cylinder. Check the brake air pressure, eliminate the fault of low brake air pressure, and ensure that the brake air pressure is 0.45-0.70Mpa.

4. Step down the brake pedal, the pedal position is very low, and the pedal gradually rises when you continue to step on the pedal, but you feel that the brake pedal is weak and the braking effect is not good, indicating that there is air in the brake system, which should be eliminated. The high-pressure gas generated by the cold heading machine driven by the engine enters the air reservoir after passing through the oil-water separator and the air pressure regulator. When the brake pedal is depressed, the high-pressure gas enters the air brake valve from the air reservoir, and then enters the air booster pump group. The afterburner cylinder is driven after generating a large pressure through the afterburner cylinder. The brake fluid at the other end enters the caliper disc brake of each wheel through the oil pipe to push the piston to clamp the brake disc, so as to brake the wheel.

5. When the brake pedal is lifted, the piston in the air brake valve cuts off the high-pressure gas channel, and at the same time, the gas in the valve is connected to the atmosphere. The afterburner pump set returns under the action of spring force to reduce the brake fluid pressure in the brake pipeline, thus releasing the braking of wheels.