252904218 brake governor for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Hand Control Brake Valve Assembly (Parking Brake Valve)
Part No.: 252904218
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Matching System: Pneumatic parking brake circuit
Valve Body Material: Cast aluminum alloy
Control Type: Manual mechanical shift control
Transmission Medium: Compressed air from air compressor
Installation: Matches original air pipes, sealing washers and fixing bolts
Working Condition: Quarry mining, aggregate yard, heavy earthwork and construction projects

Applicable Scenarios

It is installed on the control bracket inside the cab of XCMG ZL50G and ZL50GL wheel loader, widely used in quarry, aggregate yard and earthwork construction sites.

▪ OEM mounting holes, port threads and handle stroke match original parts for direct replacement with consistent operation feel
▪ Lightweight and anti-rust cast aluminum valve body with solid structure, resisting deformation after frequent operation
▪ Wear-resistant internal spool seals ensure clear shift feeling and prevent sticking or shifting failure
▪ Precise air circuit logic provides fast lock and release action, avoiding partial brake drag
▪ Integrated assembly reduces pipe joints and potential leakage points for easy maintenance
▪ Reasonable handle torque saves operation effort and reduces operator fatigue
▪ Compatible with air tank, brake cylinder, air pipe, combination valve and other pneumatic parts of the same model
▪ Factory air tightness and shift fatigue inspection screens defective units for reliable parking safety

FAQ 

Q：Can I keep working if the exhaust port leaks continuously?
A：It is not recommended. Continuous leakage may cause parking brake unable to lock or release, which brings rolling risk on slope. Replace it immediately.

Q：Why does brake remain locked after switching handle to release position?
A：It is usually caused by spool sticking or blocked air passage. Replace the whole assembly instead of partial repair.

Q：What damage will sediment and water inside valve cause?
A：Dirt and water wear seals and lock spool. Drain water from air tank regularly to protect parking valve.

Q：Does parking failure always mean this valve is broken?
A：Not necessarily. Check air tank pressure, parking cylinder and air pipe leakage first before confirming valve failure.

Q：How to store spare hand control brake valve?
A：Store in dry and ventilated place, seal all ports to prevent dust and moisture, protect handle from bending.

Q：Is seal kit repair acceptable for sticky handle?
A：Seal kit repair is only for emergency use. High failure rate under dusty vibration condition. Full assembly replacement is safer.

Q：How does low temperature affect the valve?
A：Frozen residual water locks spool and causes parking brake stuck. Drain air tank water regularly in winter.

Q：What causes slow parking brake release?
A：Aging seals and dirt inside air channel reduce airflow and delay release. Inspect or replace the valve assembly.