252108084 energizing cylinder for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Brake Booster Pump Assembly
Part No.: 252108084
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Matching System: Air-over-oil brake hydraulic circuit
Main Material: Ductile iron, aluminum alloy
Power Medium: Compressed air; Working Medium: Brake fluid
Installation: Matches original brake oil pipes, air pipes, sealing washers and bolts
Working Condition: Quarry mining, aggregate yard, heavy earthwork and construction projects

Applicable Scenarios

It is mounted on the chassis brake bracket of XCMG ZL50G and ZL50GL wheel loader, installed between air tank and brake controller, widely used in quarry, aggregate yard and earthwork construction sites.

▪ OEM mounting holes and port specifications match original parts for direct installation without reworking
▪ High-strength cast iron pump body withstands pressure and impact, resisting deformation under repeated braking
▪ Complete brake-fluid-resistant seal kit prevents cross-leakage between air chamber and oil chamber
▪ Precisely ground piston and plunger deliver smooth pedal feel and stable boosting output
▪ High-performance return spring provides fast reset after brake release to avoid brake drag
▪ Integrated oil reservoir for convenient brake fluid refilling, compact structure saves chassis space
▪ Compatible with brake controller, brake caliper, pipes and hand brake valve of the same model for easy stock management
▪ Dual air & hydraulic pressure inspection screens defective pumps with internal leakage for reliable braking performance

FAQ 

Q：Can I keep working if the booster pump leaks both air and oil?
A：It is not recommended. Combined leakage means seal failure and insufficient braking force. Stop the machine and replace it immediately.

Q：The brake pedal is soft but braking force is weak, is the booster pump broken?
A：Not necessarily. Check air tank pressure and air in oil circuit first. Confirm pump fault only after eliminating these factors.

Q：What harm does aged brake fluid bring?
A：Contaminated brake fluid corrodes the pump and accelerates seal swelling, leading to internal leakage and boost failure.

Q：What is the symptom of cross leakage between air and oil chamber?
A：Continuous bubbles in oil reservoir and unstable braking force, caused by damaged main seal. Replace whole assembly.

Q：How to store spare booster pump?
A：Store in dry and ventilated place, seal all ports, protect plunger from impact and dirt.

Q：Is seal repair kit acceptable?
A：Repair kit is only for emergency use. Full assembly replacement is safer for brake system under heavy vibration.

Q：How does low temperature affect booster pump?
A：Low temperature increases brake fluid viscosity and reduces seal flexibility. Use low-temperature suitable brake fluid in winter.