252109462 energizing cylinder for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Brake Booster Assembly (-air over hydraulic)
Part No.: 252109462
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Matching System: Air-over-hydraulic brake system
Housing Material: Cast aluminum alloy
Internal parts: Piston assembly, rubber seals, bleed screw, air inlet fitting, oil outlet fitting
Installation: Bolt mounted; air port to air tank, oil port to brake hydraulic pipeline
Working Condition: Quarry mining, aggregate yard, heavy-load earthwork
Inspection Items: Air tightness test, hydraulic leakage test, piston stroke test, visual inspection

Applicable Scenarios

It matches the air-over-hydraulic brake circuit of XCMG ZL50G and ZL50GL wheel loader, widely used in quarry, aggregate yard and construction sites. It converts air pressure into hydraulic brake pressure to boost braking force, ensuring light pedal feel and stable brake response.

- OEM design, mounting holes and ports match original parts perfectly. No bracket or pipe modification required for quick installation
- Integral cast aluminum housing features high rigidity, light weight and good heat dissipation, slowing seal aging under repeated braking
- Separated air and oil chamber structure with high-quality seals prevents cross-contamination of air and brake fluid
- Precisely fitted piston moves smoothly, providing linear and stable boost output with minimal hydraulic fluctuation
- Equipped with bleed screw for easy air purging after fluid replacement, simplifying on-site maintenance
- Dual air and hydraulic pressure inspection eliminates internal leakage for reliable braking performance
- Fully compatible with air tank, brake hose and wheel brake cylinder of the same model for convenient spare parts management

FAQ 

Q：Can the booster pump keep working with air or oil leakage?
A：Stop operation immediately. Leakage causes insufficient braking force and brings risk of brake failure. Repair or replace it at once.

Q：What are the symptoms of cross leakage between air and oil chamber?
A：Spongy pedal, weak braking, air re-entering quickly after bleeding, and brake fluid entering the air tank. It means internal seals are damaged.

Q：Is bleeding mandatory after booster replacement?
A：Yes. Air trapped in hydraulic circuit leads to poor brake performance. Systematic bleeding is required.

Q：What causes piston sticking?
A：Degraded brake fluid, contamination and swollen aged seals are the main causes. Regular brake fluid replacement is recommended.

Q：What to check when receiving goods?
A：Verify part number, check housing for cracks, inspect thread integrity and test smooth piston movement.

Q：Can this booster fit other brands of loaders?
A：Not recommended. Bracket, port and boost stroke are customized for ZL50G and ZL50GL. Mismatch leads to poor performance.