803004043 pilot valve for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Part Number：803004043
Product Name：Pilot Valve
Applicable Model：XCMG ZL50G, ZL50GL Wheel Loader
Material：High-strength cast aluminum alloy valve body, alloy steel spool
Sealing Elements：Nitrile rubber seal
Pilot Supply Pressure：System pilot pressure
Output Mode：Proportional pressure output
Working Medium：L-HM46 anti-wear hydraulic oil
Working Temperature：-20℃ ~ 80℃
Connection Form：Threaded oil port, bolt fixed installation
Inspection Items：Dimensional inspection, response characteristic test, pressure holding leakage test, internal cleanliness detection

Applicable Scenarios

It is used for pilot control of boom and bucket hydraulic circuit of 5-ton wheel loader, matched with main multi-way valve, suitable for earthwork, quarry, sand yard, port bulk loading and unloading and other long-time continuous operation conditions.

• Produced strictly according to OEM standards, installation size and oil port position are consistent with original valve, direct replacement without modification.
• Linear proportional output characteristic, smooth and stable action, effectively avoid impact when starting and stopping.
• Light operating force, reduce driver fatigue during long-time operation, good human-computer experience.
• High-precision matching spool group, small internal leakage, stable pressure signal output.
• Compact aluminum alloy valve body, light weight, good vibration resistance and not easy to deform.
• Built-in reset spring, the handle can automatically return to neutral position reliably.
• Strict factory performance test, stable batch quality, convenient spare parts stocking and maintenance.

FAQ 

Q: Can I disassemble and adjust the internal spring and spool clearance by myself?
A: It is not allowed. Random adjustment will change the proportional characteristic, cause out-of-control action and bring safety risks.

Q: What are the common reasons for the slow response of pilot control?
A: Pilot oil supply insufficient, oil filter blockage, serious spool wear and internal leakage will lead to slow action response.

Q: What should be checked before installing the pilot valve?
A: Check the valve body for cracks and damage, clean the oil passage, confirm that each sealing ring and thread are intact.

Q: What phenomenon will occur when the pilot valve cannot return to neutral?
A: The working device will keep moving continuously, which is easy to cause collision accident and needs to stop the machine for inspection immediately.

Q: What influence will oil pollution bring to the pilot valve?
A: Hard particles in hydraulic oil will scratch the matching surface of the spool, aggravate wear and damage control accuracy.

Q: How to maintain the pilot valve in daily use?
A: Regularly check each oil port for oil seepage, keep the hydraulic oil clean, and replace the filter element on schedule.