251400266 shaft sleeve for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

- Product Name: Hinge Bushing
- Part No.: 251400266
- Applicable Model: XCMG ZL50G, ZL50GL wheel loader
- Material: Wear-resistant alloy steel
- Surface & Heat Treatment: Inner hole quenching and tempering, outer surface anti-rust passivation treatment
- Hardness: Inner hole HRC 48~55, outer circle HRC 28~36
- Machining Tolerance: Inner hole ISO H7 precision tolerance, outer diameter ISO s6 interference tolerance
- Surface Roughness: Inner wall Ra ≤0.8μm, outer circle Ra ≤1.6μm
- Geometric Tolerance: Straightness ≤0.03mm, Roundness ≤0.02mm
- Installation Mode: Interference press fit with base hole, clearance fit with pin shaft
- Lubrication Structure: Built-in spiral oil groove for grease storage and uniform oil distribution

▪ Made of high-quality wear-resistant alloy steel, combined with mature quenching and tempering heat treatment process. The inner friction surface achieves high hardness and wear resistance, while the outer layer retains proper toughness, effectively resisting cyclic impact load, avoiding cracking and chipping under long-time heavy-load operation.
▪ Adopts high-precision inner hole grinding process, the friction surface is smooth and burr-free, with stable and consistent fit clearance. It can greatly reduce sliding friction loss, slow down the abrasion of matching pin shaft, extend the service life of the whole hinge assembly and lower the overall maintenance frequency.
▪ Unique spiral oil groove structure on inner wall, which can store enough lubricating grease and distribute grease evenly along the sliding surface. It maintains continuous protective oil film, effectively blocks dry friction, reduces the risk of oil channel blockage and local wear.
▪ Strictly produced according to original factory drawing standards, the dimension and tolerance fully match the original assembly structure. Excellent interchangeability supports direct press-fit replacement without secondary reaming, welding or modification, greatly shortening equipment downtime and improving maintenance efficiency.

FAQ 

Q1: What is the main function of the bushing?
A1: It is used as a sliding bearing between the pin and frame hole, avoiding direct friction between the pin and the frame, protecting the frame hole from being worn out.

Q2: What signs indicate that the bushing needs to be replaced?
A2: Obvious clearance and shaking at the hinge, abnormal knocking noise during operation, serious inner hole scoring, eccentric wear, grease leakage and poor lubrication.

Q3: Can this bushing be installed on other loader models?
A3: It is specially developed for ZL50G and ZL50GL. Do not install it on other models without checking the size.

Q4: What should we pay attention to during pressing installation?
A4: Clean the base hole thoroughly before pressing; use a special pressing tool, do not hammer hard to prevent deformation of the bushing; align the oil groove with the grease passage.

Q5: How to maintain to extend service life?
A5: Grease on schedule according to maintenance cycle; ensure that the oil passage is unobstructed; prevent mud, sand and dust from entering the friction clearance.

Q6: Can I only replace the bushing without replacing the pin?
A6: If the matching pin shaft has obvious scoring and out-of-round wear, it is recommended to replace the pin, bushing and oil seal together for the best matching effect.