250400158 boom cylinder pin for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Boom Cylinder Pin
Part No.: 250400158
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Material: Forged alloy steel, tempered + induction hardened
Function: Hinge lift cylinder and boom, transmit thrust, act as pivot for cylinder swing
Matching parts: bushing, dust seal, grease nipple
Working condition: Alternating combined impact load
Inspection Items: OD & length inspection, crack detection, hardness test, straightness test, grease passage check

Applicable Scenarios

Installed at cylinder lug to connect lift cylinder and boom, cooperating with hydraulic cylinder for boom lifting and lowering. Widely used in quarry, mine, construction site and cargo terminal for heavy-duty earthwork loading and stockpiling under dusty, high-impact conditions.

- Manufactured to original drawing, accurate OD, length and grease passage position, direct fit without modification
- Forged alloy steel with induction hardening, scratch-resistant surface and tough core, resist bending and fracture
- Through grease channel distributes lubricant evenly across friction surface and reduces dry wear
- Precision ground shaft with good straightness, uniform clearance for smooth cylinder swing and less impact noise
- Protect expensive cylinder lug and boom bore; wear is limited on replaceable pin and bushing
- Crack inspection before delivery to avoid sudden breakage during operation
- Fully compatible with ZL50G / ZL50GL cylinder bushing, dust seal and lubrication parts

FAQ 

Q：What symptoms occur when the boom cylinder pin is worn?
A：Excessive clearance at cylinder hinge, obvious jitter during lifting and lowering, heavy impact noise when cylinder swings, unstable bucket posture and material spillage. In severe cases, the pin is unevenly worn and jammed, cylinder load tilts and pressure surges.

Q：Does lifting jitter always mean this cylinder pin is worn?
A：No. First check bushing wear and damaged dust seal, also check cylinder internal leakage and other hinge clearances. Confirm pin damage only after eliminating those faults.

Q：Can slightly bent boom cylinder pin be straightened for heavy use?
A：Not recommended. Straightening destroys heat treatment stress and creates invisible micro-cracks. Repeated impact will propagate cracks and damage cylinder lug. New pin is the safe choice.

Q：Can pins from different positions or models be interchanged?
A：Not interchangeable. Diameter, length, load rating and grease passage layout differ. Wrong fit causes abnormal clearance, cylinder jamming or lug damage. Always verify part number.

Q：What precautions should be taken during pin installation?
A：Support cylinder safely to prevent falling under pressure. Clean dirt and burrs on hinge holes. Inspect bushing and dust seal. Install gently without heavy hammering. Inject grease and test full lifting stroke.

Q：Is stroke or limit adjustment needed after replacement?
A：No adjustment required for genuine same-part-number replacement. If cylinder lug or boom bore is severely out of round, inspect and repair the hole together.