252100417 rocker arm pin for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Rocker Arm Pin
Part No.: 252100417
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Material: Forged alloy steel, tempered + induction hardened
Function: Hinge bucket rocker and boom beam, act as rotation fulcrum, withstand combined impact load
Matching parts: bushing, dust seal, grease nipple
Working condition: Combined tension-compression alternating impact load
Inspection Items: OD & length inspection, crack detection, hardness test, straightness test, grease passage check

Applicable Scenarios

Installed on front boom section as rotation pivot for bucket rocker, together with rocker, pull rod and linkage. Widely used in quarry, mine, earthwork site and cargo terminal for heavy-duty bulk material handling under dusty impact conditions.

• Machined to original drawing, accurate OD, length and grease hole for direct fit without modification
• Forged alloy steel with induction hardening, wear-resistant surface and tough core, resist bending and fracture
Built-in grease channel distributes lubricant evenly and reduce local dry friction
• Precision ground shaft, strict straightness control, uniform clearance and smooth rocker rotation
• Protect expensive boom hinge hole, wear is limited on replaceable pin and bushing
• Crack inspection before delivery, stable batch tolerance for bulk stock
• Fully compatible with ZL50G / ZL50GL rocker, boom and lubrication parts, easy maintenance
• Controlled hardening depth, no brittleness, stable performance under repeated cyclic impact

FAQ 

Q：What symptoms occur when rocker arm pin is worn?
A：Excessive rocker play and shaking, heavy impact noise during bucket curl and dump, unstable dumping angle and material spillage. In severe cases, the pin is scratched and jammed, rocker rotates roughly, bucket cylinder surges and vibration reduces loading efficiency.

Q：Does rocker shaking always mean rocker arm pin wear?
A：No. First check bushing wear and damaged dust seal, also inspect whether rocker hinge hole is enlarged. Confirm pin damage only after eliminating these faults.

Q：Can a slightly bent rocker arm pin be straightened for long-term use?
A：Not recommended for heavy load work. Straightening destroys heat treatment stress and creates invisible micro cracks. As the main fulcrum pin, it may break suddenly and damage rocker and cylinder. New pin is required.

Q：Can hinge pins from different loader models be interchanged?
A：Not interchangeable. Diameter, length and grease hole position differ. Wrong fit causes abnormal clearance, rocker jamming or boom hinge hole damage.

Q：What should be noted during rocker arm pin installation?
A：Clean sand, burrs and old grease residue from hinge holes. Inspect bushing and dust seal. Align grease passage and install gently, avoid heavy hammering. Inject grease after assembly and test full bucket stroke.

Q：What causes fast wear of rocker arm pin?
A：Overloading, heavy impact on hard rock, insufficient lubrication, failed dust seal allowing sand ingress, and continuous operation with excessive hinge clearance.