250400120 cylinder head for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Cylinder Head
Part No.: 250400120
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Type: Transmission hydraulic control cylinder end cover accessory
System Position: Transmission clutch cylinder cavity end face
Function: Closes cylinder cavity, limits piston travel, retains seal assembly
Body Material: Metal (subject to actual product)
Surface Treatment: Subject to actual product
Seal Configuration: Used with seal ring/gasket
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 end cover accessory for ensuring cylinder cavity sealing and stable piston actuation.

▪ OEM outline dimensions and mounting hole positions for direct replacement on ZL50G/ZL50GL
▪ Structural strength meets system oil pressure requirements, resisting deformation under piston thrust
▪ Machined sealing mating surface for reliable sealing with seal rings/gaskets, reducing end face oil seepage
▪ Controlled mounting hole accuracy ensures good fit with cylinder cavity holes and even bolt stress
▪ Machined surface adapts to transmission oil environment, reducing wear
▪ Can be stocked together with pistons, seals, friction plates, and related transmission accessories

FAQ 

Q：When does a cylinder head need replacement?
A: Replace when sealing surface wear causes end face oil seepage, mounting hole damage prevents bolt tightening, or the cylinder head body deforms or cracks. Continued use may cause cylinder cavity sealing failure and corresponding gear slipping.

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

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

Q：What to note during cylinder head installation?
A: Confirm the cylinder head model matches the corresponding cylinder cavity, clean the sealing surface and cavity end face before installation to prevent contaminant entry. Tighten bolts symmetrically to specified torque to avoid cylinder head deformation from one-sided over-tightening.

Q：How to maintain the cylinder head daily?
A: Replace transmission oil and filters according to maintenance intervals to keep oil clean. During transmission overhaul, check cylinder head sealing surface and mounting bolt condition, and address oil seepage or deformation promptly.