251400419 upper articulation pin for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

- Part No.: 251400419
- Applicable Model: XCMG ZL50G, ZL50GL wheel loader
- Material: Alloy structural steel
- Surface Treatment: Medium frequency induction quenching
- Surface Hardness: HRC 52~58
- Core Toughness: High toughness, anti-shock cracking
- Machining Tolerance: ISO h6 precision tolerance
- Surface Roughness: Ra ≤0.8μm
- Matching Method: Cooperate with bushing and oil seal assembly
- Lubrication Structure: With grease passage for regular greasing maintenance

▪ Adopt high-quality alloy steel substrate, combine high surface hardness and internal toughness, resist impact and fatigue fracture under frequent steering impact.
▪ Precision grinding process, smooth surface, reduce friction and abrasion to mating bushing, extend the service life of hinge assembly.
▪ Standard oil channel design, convenient for grease injection to form continuous oil film, isolate dust and muddy water, reduce abrasive wear.
▪ 1:1 original size, interchangeable with original spare parts, simple installation, shorten equipment downtime.
▪ Strict quality inspection before delivery, dimension and hardness tested one by one, stable batch consistency.

FAQ 

Q1: What function does the upper articulation pin undertake?
A1: It is the upper hinge shaft of front and rear frame, bearing the swing load of steering, transferring force during turning, and keeping the frame articulation clearance within normal range.

Q2: What symptoms indicate that the upper articulation pin needs to be replaced?
A2: Abnormal knocking sound when steering, excessive clearance between front and rear frame, steering shaking, serious eccentric wear and groove scratch on pin surface.

Q3: Can this pin be used for other loader models?
A3: It is specially matched for ZL50G and ZL50GL. Do not install it on other models without confirming the drawing size.

Q4: What should be paid attention to during installation?
A4: Clean the hinge hole and bushing thoroughly, check whether the oil seal is damaged; align the oil passage, inject grease after installation, avoid forced hammering to hurt the pin surface.

Q5: How to maintain to prolong service life?
A5: Grease on schedule according to maintenance cycle; avoid long-term lack of lubrication; prevent muddy water and gravel from entering the hinge clearance.

Q6: Can we only replace the pin without changing the bushing?
A6: If the bushing inner hole has serious wear, scoring or out-of-round deformation, it is recommended to replace pin, bushing and oil seal together for best matching effect.