250400119 plunger for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Piston
Part No.: 250400119
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Type: Transmission hydraulic control actuating element
System Position: Transmission clutch cylinder cavity
Function: Transmits hydraulic thrust, compresses clutch friction plates
Body Material: Metal (subject to actual product)
Surface Treatment: Subject to actual product
Seal Configuration: Used with seal ring
Working Condition: Quarry mining, aggregate yard, heavy earthwork and construction projects

Applicable Scenarios

Widely used in quarry, aggregate yard, and earthwork construction sites requiring frequent shifting and heavy-load travel. It is a key actuating element for ensuring reliable gear engagement and stable power transmission.

▪ OEM outline dimensions and seal groove positions for direct replacement on ZL50G/ZL50GL
▪ Structural strength meets system oil pressure requirements for stable thrust output
▪ Controlled seal groove dimensional accuracy ensures reliable isolation with seal ring, reducing internal leakage
▪ Machined surface adapts to transmission oil environment, reducing wear and seizure
▪ Can be stocked together with transmission seals, friction plates, and cylinder accessories

FAQ 

Q：When does a piston need replacement?
A: Replace when shift slipping, delayed corresponding gear engagement, insufficient transmission oil pressure occurs, or inspection reveals piston seal aging, body wear/scratches, or seizure. Continued use may cause clutch friction plate burnout.

Q：Is shift slipping always caused by the piston?
A: Not necessarily. Check transmission oil level and quality, oil pump pressure, corresponding gear friction plate wear, and control valve seizure first. Inspect piston seal condition after confirming oil circuit and friction plates are normal.

Q：Can the piston be replaced separately?
A: Yes. The piston is an independent part that can be replaced separately after disassembling the corresponding cylinder cavity. Replacing the seal ring at the same time is recommended.

Q：What to note during piston installation?
A: Confirm the piston model matches the corresponding gear, clean the cylinder cavity and piston surface before installation to prevent contaminant entry. Ensure the seal ring is correctly oriented and not twisted, and apply a small amount of transmission oil before installation.

Q：How to maintain the transmission piston daily?
A: Replace transmission oil and filters according to maintenance intervals to keep oil clean. During transmission overhaul, check piston seal ring condition and replace promptly if aged or hardened.