Troubleshooting of Dongfeng Dorica wrecker

Trouble shooting method 1 The boom of the wrecker is slow and weak. ① The hydraulic power system is faulty. ② The control valve and overflow valve of the telescopic mechanism are faulty. ① Check and adjust. ② Dismantle, clean, adjust or replace the damaged parts. ② The boom of the wrecker is vibrating. ② The problem of the boom slider is abnormal. ① There is insufficient lubrication between the sliding surface of the boom box and the slider, so grease should be applied. 3 The extension length of each boom of the wrecker can't be compensated. ① Electromagnetic valve failure ② Circuit failure ① Cleaning the oil filter and replacing the electromagnet. ④ Automatic retraction of the boom of the wrecker ① Telescopic oil cylinder failure ② Balance valve failure inspection and adjustment of telescopic oil cylinder, replacement of damaged parts. 5. The lifting mechanism of the wrecker does not move or moves slowly. ① Vehicle control valve failed. ② Hydraulic motor failure. ③ The balance valve fails. ④ The lifting brake was not checked and handled. Adjust and replace spring 6. When the lifting mechanism of the wrecker works, the check valve moves intermittently. Failed to clean and replace 7. When the wrecker leaves the hook, the load is out of control. Failure to remove and clean 8. The brake of the lifting mechanism of the wrecker won't open. 1. Shuttle valve is stuck. 2. The shuttle valve leaks internally. 3. The brake piston is poorly sealed. 1. Repair shuttle valve. 3. Repair the brake. Replace the seal. 9. The bell does not ring; The electric bell is damaged; Overwinding relay is damaged and overhauled; 10; The luffing cylinder of the wrecker automatically retracts; The cylinder itself fails; Balance valve failure; 1) Check and clean; Replace damaged parts; 1 1; Vibration of luffing cylinder of wrecker; 2) There is air in the cylinder; 2) The balance valve is improperly adjusted or the valve core is damaged; Throttle hole is blocked; 1) Repetitive oil charging and exhaust for luffing action 12 Troubleshooting of two-way hydraulic lock 13 Repair the two-way hydraulic lock when the leg of the wrecker cannot be retracted. Legs will automatically retract when you lift them. ① The one-way valve in the two-way hydraulic lock has poor sealing performance. ③ Oil leakage in the oil cylinder. ② Repair the check valve in the bidirectional hydraulic lock. ② Repair the seal on the cylinder piston. ① The hydraulic pump is damaged. ② The overflow valve is out of order. ③ The rotating joint is damaged. ④ Manual control valve is damaged. Check and repair 15. The oil temperature rises too fast ① The hydraulic pump is damaged or faulty ② The hydraulic oil is polluted or the oil quantity is insufficient ① Replace or repair ② The hydraulic oil should be replaced or replenished. 16 The hydraulic pump of the wrecker does not rotate the power take-off or its control gas path is not checked. Repair or replace the power take-off and pneumatic system 17. The oil filter is blocked due to the high pressure in the oil circuit. Replace the filter element 18. The hydraulic oil of the wrecker leaked out. Seal is damaged. The pipeline is damaged. Replace the seal. Tighten or replace the connector. Replace the pipeline. 19 The rotating joint is poorly energized. Poor contact between brush and slip ring. The wire connector is welded. Repair the wire connector. There is air in the noisy pipeline of the oil system. Oil replenishment and exhaust