1. No pressure or insufficient pressure in the system
Problem: The overflow valve is open, the valve core is stuck and cannot be closed, the damping hole is blocked, the valve core and the valve seat do not match well or the spring fails.
Solution: Repair the valve core and the housing, clean the damping hole, and replace the spring.
Problem: The valve core of other control valves is stuck due to a fault, causing unloading.
Solution: Find the fault location, clean or repair it, so that the valve core can move flexibly in the body.
Problem: The hydraulic components are severely worn or the seals are damaged, causing internal and external leakage.
Solution: Check the sealing of the pump valve and the connection of the pipeline, repair or replace parts and seals.
2. Insufficient flow
Problem: The oil tank level is low, the oil viscosity is large, and the filter is blocked, causing you to suck oil resistance.
Solution: Check the liquid level, add oil, replace the hydraulic oil with appropriate viscosity, and ensure the diameter of the oil suction pipe.
Problem: The hydraulic pump is seriously worn when idling, and the performance is reduced.
Solution: Check the engine, hydraulic pump and hydraulic pump variable mechanism, and replace the pump if necessary.
Problem: The return oil pipe is above the liquid level, and air enters.
Solution: Check whether the pipeline connection and seal are correct and reliable.
Problem: The accumulator leaks, and the pressure and flow supply are insufficient.
Solution: Check the performance and pressure of the accumulator.
3. Leakage
Problem: The joint is loose and the sealing is damaged.
Solution: Tighten the joint and replace the seal.
Problem: The preload force of the plate connection or flange connection joint surface screw is insufficient or the sealing is damaged.
Solution: The preload force is greater than the liquid pressure, and the seal is replaced.
Problem: The system pressure is greater than the rated working pressure of the hydraulic component or auxiliary component for a long time.
Solution: The component housing pressure should not be greater than the allowable pressure of the oil seal, and the seal is replaced.
4. Overheating
Problem: Improper pressure adjustment and long-term operation under high pressure.
Solution: Adjust the overflow valve pressure to the specified value and improve the circuit if necessary.
Problem: Excessive power loss due to leakage and mechanical friction in the system.
Solution: Check for leaks, improve seals, and improve the machining accuracy, assembly accuracy, and lubrication conditions of moving parts.
5. Vibration
Problem: Hydraulic pump, air inhalation, too high installation position, large oil suction resistance, insufficient gear tooth profile accuracy, blades stuck and broken, plunger stuck and inflexible movement, and parts wear causing excessive clearance.
Solution: Replace the oil inlet seal, the distance from the oil suction port to the pump suction port should be less than 500mm, ensure the diameter of the oil suction pipe, and repair or replace damaged parts.
Problem: Hydraulic oil, the liquid level is too low, the oil suction pipe is not inserted deep enough into the liquid surface, the oil viscosity is too high, and the filter is blocked.
Solution: Add oil, extend the oil suction pipe to the specified depth, replace the viscosity hydraulic oil, and clean the filter.
Problem: Overflow valve, damping hole is blocked, the clearance between the valve core and the valve seat is too large, and the spring fails.
Solution: Concrete pump truck manufacturers clean the damping hole, repair the clearance between the valve core and the valve seat, and replace the spring.
Problem: Other valve cores are not flexible.
Solution: Clean and deburr.
Problem: Pipes, the pipes are long and thin, there is no fixing device, they collide with each other, and the suction pipe and the return pipe are too close.
Solution: It means to install fixing devices to expand the distance between pipes and the distance between the suction pipe and the return pipe.
