803004073 accumulator for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Accumulator
Part No.: 803004073
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Type: Bladder-type accumulator
System Position: Full hydraulic brake system (service brake / emergency parking brake circuit)
Service Brake Accumulator Precharge: 5.5MPa (20°C)
Emergency Brake Accumulator Precharge: 9.2MPa (20°C)
Charging Medium: Nitrogen
Installation: Vertical, gas valve upward
Function: Energy storage, pressure stabilization, brake assist, pulsation absorption
Working Condition: Quarry mining, aggregate yard, heavy earthwork and construction projects

Applicable Scenarios

Used in the full hydraulic brake system of XCMG ZL50G and ZL50GL wheel loaders, installed in the service brake and emergency/parking brake circuits to provide a stable pressure oil source for the brakes. Widely used in quarry, aggregate yard, and earthwork construction sites requiring frequent braking and heavy-load travel. It is a key hydraulic component for ensuring loader braking safety.

▪ OEM interface dimensions and pressure ratings for direct replacement on ZL50G/ZL50GL
▪ Bladder-type design provides efficient energy storage and rapid pressure release for responsive braking
▪ Factory shell sealing inspection reduces risk of port leakage and pressure retention loss
▪ Matched to ZL50G brake system parameters (service precharge 5.5MPa / emergency precharge 9.2MPa) for original braking characteristics
▪ Absorbs hydraulic pump pulsation, reduces pipeline impact, and protects brake valve and pressure switch
▪ Compact structure fits loader frame mounting space for easy maintenance
▪ Can be stocked together with brake system seals, pressure switches, and related parts

FAQ 

Q：What are the symptoms of insufficient accumulator precharge?
A: Weak braking, brake lock-up with light pedal application, delayed brake response, or abnormal emergency brake actuation. ZL50G service brake accumulator precharge should be 5.5MPa at 20°C; inspect charging or replace if below spec.

Q：Can the accumulator be charged with air?
A: No. Only nitrogen is permitted. Oxygen, compressed air, or flammable gases are strictly prohibited due to explosion risk.

Q：How to determine if the accumulator needs replacement?
A: Replace when bladder aging/leakage, inability to hold precharge, severe shell corrosion, port oil seepage, or slow brake system pressure build-up occurs.

Q：What are the installation requirements?
A: Install vertically with gas valve upward, securely fixed to the bracket. Welding for fixation is not allowed.

Q：What to do before disassembling the accumulator?
A: Release pressure oil and discharge nitrogen from the bladder using a charging tool before disassembly. Never work under pressure.

Q：How to maintain the accumulator daily?
A: Periodically check bladder precharge with a charging tool. Weekly for new machines initially, monthly after one month, quarterly after six months, and semi-annually after one year.