When we carry out large-scale operations, we often use cranes. But at present, enterprises are more willing to choose Huai'an crane rental , mainly because the purchase of a crane requires a one-time payment of funds. Choosing to rent is beneficial to the flow of enterprise funds, compared with Crane rental High cost performance. However, some failures are inevitable when the crane is used. Today, Huai'an equipment displacement The manufacturer will explain to you the causes of the common faults of the crane and their troubleshooting methods:

1. The oil pump does not deliver oil

Cause: The oil level in the oil tank is too low, the rotation direction is wrong, the oil suction pipe leaks, and the hydraulic oil is too viscous.

Troubleshooting: add enough oil, change the rotation direction of the pump, eliminate air leakage, and replace with qualified new oil.

2. Insufficient oil pressure or displacement of oil pump

Cause: safety valve failure; The oil pump is severely worn; Gear wear clearance is too large.

Troubleshooting: repair all parts of the safety valve; Repair or replace the oil pump; Adjust the clearance.

3. The oil pump pressure is unstable or vibrates severely

Cause: insufficient oil or air intake; There is friction between the gear and the inner surface of the housing.

Troubleshooting: refuel and eliminate air leakage; Replace the gear.

4. The oil supply of hydraulic oil pump is insufficient or cut off

Cause: The pump suction pipe is deformed, and the channel becomes smaller or blocked; The bearing is damaged, and the gear scraping pump body causes excessive clearance and serious internal leakage; The gear is damaged, and the gear and pump body are stuck; The plunger and cylinder body of the plunger pump are severely worn or the sealing area of the oil distribution plate is poorly sealed.

Troubleshooting: remove the clogged dirt and replace the pipe; Replace the bearing and gear, pair and grind the plunger couple in case of light condition, and replace the pump in case of serious condition.

5. Oil leakage of small crane oil cylinder

Cause: The seal ring is damaged or worn.

Troubleshooting: Replace.

6. The inner cavity of the small crane oil cylinder often produces gas

Cause: The oil contains water; Oil inlet pipe joint of oil pump leaks; Insufficient oil.

Troubleshooting: replace with new oil to eliminate water ingress fault; Tighten the joint; Fill the oil tank according to the specified oil level.

7. Oil cylinder of small crane moves slowly

Cause: There is air in the cylinder.

Troubleshooting: exhaust air.

8. The oil cylinder of the small crane does not move smoothly or even does not move

Cause: The oil seal of the oil cylinder is too tight or the oil seal is deteriorated.

Troubleshooting: loosen the oil seal cover until there is no oil leakage, or replace the oil seal.

9. Automatic retraction of hydraulic cylinder of small crane

Cause: the piston seal ring is damaged; The spring on the one-way valve core in the two-way hydraulic lock is damaged; There is dirt on the surface of the check valve core and the valve seat, or the valve seat is scratched and the check valve core is cracked; The check valve in the balance valve is not tightly closed.

Troubleshooting: Replace with a new sealing ring; Disassemble and clean the two-way hydraulic lock to remove dirt; Replace the damaged spring and the cracked check valve assembly; Repair or replace the one-way valve element that is not tightly closed in the balance valve.

The above are the common faults and troubleshooting methods of the crane. I hope they can help you!