252905227 brake governor for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Hand Brake Control Valve Assembly
Part No.: 252905227
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Function: On-off control of parking brake air circuit
Valve Body Material: Die-cast aluminum alloy
Internal Structure: Spool, return spring, oil-resistant rubber seals
Port Type: Threaded air ports
Installation: Matches original brake air hoses, pipe clamps, support brackets and sealing washers
Working Condition: Quarry mining, aggregate yard, heavy earthwork and construction projects

Applicable Scenarios

It is installed inside the cab of XCMG ZL50G and ZL50GL wheel loader, connected between air reservoir and brake cylinder in parking brake circuit, widely used in quarry, aggregate yard and earthwork construction sites.

▪ OEM port layout, hole spacing and handle stroke match original parts for direct installation
▪ Lightweight aluminum alloy valve body resists corrosion and reduces spool jamming
▪ Precisely matched spool with aging-resistant seals delivers stable pressure holding performance
▪ Built-in high-performance return spring provides clear gear position and smooth operation
▪ Independent port layout separates inlet, outlet and exhaust for fast pressure switching
▪ Dust-proof structure reduces dust ingress and internal wear of spool
▪ Compatible with air reservoir, brake cylinder, air pipes and brackets for convenient stock management
▪ Cycle air tightness inspection screens defective valves to guarantee reliable parking brake control

FAQ 

Q：Can the valve with continuous air leakage keep working?
A：It is not allowed. Damaged internal seals cause pressure loss and rolling risk on slopes, replace immediately.

Q：What causes stiff handle and unclear gear position?
A：Dust contamination, seal aging or spool corrosion. Replacement of whole assembly is recommended.

Q：Is slow parking brake release always caused by this valve?
A：Check air tank pressure and pipe leakage first. Replace the valve only if air supply is normal.

Q：Can I only replace internal seal kit?
A：Seal kit is only for emergency use. Worn spool will lead to recurring failure under heavy vibration.

Q：How to store spare hand brake valve?
A：Store in dry dark place, seal all ports against dust and avoid heavy pressure on handle.

Q：What is the hazard of ineffective parking brake?
A：Machine rolling on slope, which may lead to collision accident. Stop operation immediately.

Q：How to test after installation?
A：Fill air to rated pressure, operate handle repeatedly, check pressure gauge for normal lock and release.