XCMG ZL50GN Variable Speed Pump 803004322

Part number 803004322 is listed as a variable speed pump for the XCMG ZL50GN wheel loader. This component belongs to the loader transmission oil circuit, where correct oil supply supports clutch control and gear engagement. Because pump housings can look alike, buyers should match the complete number, drive interface, mounting face and port arrangement before replacement.

Diagnostic point: Slow engagement or weak drive does not identify the pump by itself. Oil level, filter restriction, suction leakage, control-valve leakage and clutch condition should be checked as part of the same diagnosis.

Transmission performance starts with clean oil

A variable speed pump works inside a system. Contaminated oil or a restricted suction path can reduce supply and damage a replacement part. Before removal, note whether the complaint appears cold, hot, in one gear or in every range. Record any pressure-test findings using the service procedure for the specific machine.

Checks before replacement

• Confirm the transmission oil level and correct oil specification from the machine documentation.

• Inspect the oil and filter for debris; investigate contamination before installing another pump.

• Check the suction line, seals and joints for air entry or collapse.

• Compare the 803004322 marking with the complete original-pump label.

• Photograph hose positions and cap open lines as soon as they are disconnected.

Physical identification

For a reliable enquiry, photograph the label, drive end, mounting face and every port. Include the ZL50GN machine serial plate. Measure only the interfaces requested by the parts specialist; an outside dimension alone cannot confirm internal pump configuration or displacement.

Installation and commissioning

Cleanliness matters throughout the repair. Flush contaminated lines as required, renew specified seals and inspect the drive coupling or gear for damage. The replacement must seat without being forced by the mounting bolts. Prime the circuit and carry out the approved start-up checks. Observe pressure, leakage, noise and transmission response before returning the loader to work.

Related transmission and pump parts

For the control side of the driveline, review the XCMG shift control valve ZL40A.6.18A. Buyers comparing another pump type can see the ZL50GN duplex pump 803013093. These products serve different circuits and are not presented as substitutes.

FAQ

Is 803004322 confirmed for every ZL50GN?
It is listed for ZL50GN, but confirm the serial number and original pump because production configurations can change.

Can delayed gear engagement be caused by something else?
Yes. Oil condition, filters, suction leaks, control valves and internal transmission leakage can create similar symptoms.

Should the system be flushed?
If contamination or a failed component is found, follow the machine service procedure for cleaning the reservoir, lines and related parts before commissioning.

What information is needed for a quotation?
Send 803004322, machine model and serial number, quantity, destination, and clear photos of the label and interfaces.

Fitment note: Final compatibility depends on the original component and machine configuration.