Hoist, winch common causes of failure and repair (highlights)

Hoisting winch machine, winch common causes of failure and repair (highlights) repair of the cause of the malfunction, the brake two, reducer three, spindle device four, hydraulic station other

Malfunction

The reason

Repairement

Braking device

1. Brake is not released (no release)

No oil pressure or insufficient oil pressure

Brake seal damaged

1. Check the hydraulic station

2. Replace the seal

2. Brake loosen and working slowly

1. Hydraulic system with air

2. Valve is not in normal position, or oil is polluted

3. Brake shoe clearance is too large

4. Oil is too thin, or oil spill too much

5. The seal is damaged

1. In the braking state, deflate at the highest point

2. Inspect and clean valve and system

3. Redial the gap

4. Change the oil, check and repair the hydraulic system

5. Replace the seal

3. The brake can not work

1. Hydraulic station and piping have problems

2. The brake is damaged and the liner with the cylinder stuck in the cylinder

1. Check and repair the hydraulic station

2. Check and repair the brake

4. Braking time or brake taxiing distance is too long, the braking force is small

1. The load is too high or the speed is too high

2. Brake shoe clearance is too big

3. There is paint or the like on the brake disc and shoe

4. All brakes do not move

5. Spring group defective

6. Seal wear

1. Check if it is overloaded and the speed is too high

2. Adjust the gap

3. With polyethylene brake disc, replace the sticky oil brake shoe

4. Check the hydraulic station

5. Replace the spring

6. Replace seal and inspect all sealing surfaces

5. Brake shoes uneven wear

1. Brake calibration is not uniform

2. The brake disc deflection is too big, string or spindle tilt larger

1. Check the installation technical requirements

2. Heavy car brake disc, check the spindle tilt angle adjustment and bearing

6. Brake shoes accidental wear

1. Increase the use of brakes

2. Brake shoe clearance is too small

3. The brake cannot be released evenly

1. Check the electrical brake, the speed limiter work, driver operation is correct, check the load speed and braking frequency is correct.

2. Adjust the brake shoe clearance

3. Check the hydraulic pressure and piping

7.The hydraulic station is not working properly

1. Oil is not clean

Long-term operation

1. Clean the solenoid valve and change the hydraulic oil

2. Strengthen the heat

Malfunction

The reason

Prepayment

Reducer

8. The bearing is wearing hot.

1. Uneven bearing clearance or damage

2. The oil is not enough or unclean

1. Adjust the gap, or replace

2. Come on or change oil

9. Reducer noise or vibration

1. Bearing clearance is too large

2. Gear wear is too large, poor lubrication

3. Overload, speeding operation

4. Reducer bolt loose

5. The reducer into foreign objects, damaged tooth surface, tooth shape

1. Adjust bearing clearance

2. Replace the gear, in accordance with the requirements of the replacement of suitable lubricants

3. Winch as required

4. Check and tighten the bolts in all parts

5. Clear foreign objects, file repair was deformed teeth

10. Reducer leakage

1.Too much fuel

2. Union bolt, fastening bolt is not compressed

3. The seal is damaged

1. The oil level does not exceed the middle gear 1-2 tooth height

2. Check the fastening

3. Replace the seal

Winch Baring Device

11. The drum gives an abnormal sound

1. Coupling appears loose or broken, resulting in relative vibration

2. Weld cracking, deformation

3 roller lining wood damaged

4. Local stress is too large, the connector loose or broken

1. Tighten, repair or replace

2. Welding repair, reduce the load or reinforcement on the drum

3. Replacement roller lining wood

4. Reinforced inside the drum reinforcement

Brake common faults and repairs

Symptoms

Possible Causes

Repair Method

1.Brake can not be released

1.1 There is no brake oil pressure or insufficient brake oil pressure

1.2 brake seal damaged

Check the hydraulic station

Change the seal

2. Slow brake or brake

2.1 Hydraulic system with air

2.2 hydraulic system spool blocked

2.3 brake shoe clearance is too large

2.4 hydraulic oil viscosity does not meet the requirements, or leak too much

2.5 seal damage

Exhaust the air inside the brake

Check and clean the valve and system

Re-adjust the brake shoe clearance

Change hydraulic oil, check and repair hydraulic system

Change the seal

3. Brake can not brake

3.1 Hydraulic station and oil system is faulty

3.2 Brake damage, the liner with the cylinder card

Repair hydraulic station

Check and repair brake

4. Braking force is too small, braking time is too long

4.1 hoist overload or speeding operation

4.2 brake shoe clearance is too large

4.3 brake disc with oil or other debris

4.4 All brakes cannot move

4.5 Faulty spring group

4.6 ring damage

Check if the load and speed are within the allowable range of the hoist

Adjust the brake shoe clearance

Clean the brake disc or replace the brake shoe with polyethylene solution

Check the hydraulic station

Replace the spring group

Check or replace the seal

5. Brake shoes uneven wear

5.1 Brake calibration is not uniform

5.2 The brake disc deflection is too large or the spindle axial strokes larger, or the spindle inclination is too large

Check whether the installation meets the technical requirements

Turning the brake disc, check the spindle inclination and bearing clearance adjustment

6. Brake shoes accidental wear

6.1 Brake abnormal use

6.2 Brake shoe clearance is too small

6.3 Brake operation is not synchronized

Check the dynamic braking, speed limiter function is correct, whether the provisions of the operation;

Adjust brake shoe clearance.

Check hydraulic pressure and piping.

Hydraulic Station Common Faults and Handling

Order	Symptoms	Cause of Issue	Method of exclusion
1	After the pump is started, the proportional relief valve return pipe is not back to the oil	Motor is not turning	Change the motor steering
2	When the oil pressure increases, there is a lot of bubbles on the oil surface, meanwhile there is more noise and pressure is not stable	Suction port leakage, or suction port oil filter is blocked, increased oil absorption caused by air inhalation	Check and handle the suction port seal; clean the suction port oil filter
3	Pump heat, noise, disassembled inspection with oil pan abrasions	The gap between the oil pan and the rotor is too small	Remove the oil pan and the rotor, the abrasion surface with a flat grinder flattened, with a shim assembly to adjust the gap between the oil pan and the rotor
4	Mainline pressure cannot be adjusted, or suddenly dropped to zero during normal operation	Proportional relief valve plugged	Clean and clear the proportional relief valve
5	There is a large amount of oil leakage between the valve and the oil collecting block, and the oil pressure drops, so it can not be released	Fix valve screw loose	Tighten the screw
6	The hydraulic pressure is normal, but the brake cannot be released or only part of it is released	Electromagnets G3, G4, G5 required voltage is too low, or the voltage is too high to burn the coil	Check the electrical circuit and electromagnet if the coil burns newer
7	After the emergency brake, no pressure or pressure on the main oil line cannot reach the normal value	Proportional relief valve spool is stuck, or the pilot valve orifice is blocked, or hydraulic valve spool is core die	Clean overflow valve, valve spool movement required to clear the control hole, cleaning hydraulic valve to move the spool required flexible
8	Accumulator hydraulic unable to hold	The relief valve spool on the oil collecting block is stuck or the orifice of the relief valve control port to the pilot valve is blocked	Clean overflow valve, spool movement required to clear the control hole
9	Accumulator pressure is the same as mainline pressure and not adjustable	Pressure relief valve spool is stuck, or the relief valve orifice is blocked	Clean the pressure relief valve and unblock the orifice