805601608 B-type Pin for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

- Product Name: B-type Pin
- Part No.: 805601608
- Applicable Model: XCMG ZL50G, ZL50GL wheel loader
- Main Material: Alloy structural steel
- Forming Process: Forging blank, finish turning, cylindrical grinding
- Heat Treatment: Surface high-frequency quenching + tempering
- Surface Hardness: HRC 52~58
- Core Hardness: HRC 28~36
- Outer Diameter Tolerance: ISO f7 precision tolerance
- Surface Roughness: Ra ≤0.4μm
- Geometric Tolerance: Roundness ≤0.01mm, Straightness ≤0.02mm
- Structure Feature: B-type structure, with oil groove / oil hole for grease lubrication
- Matching Part: Supporting hinge bushing, circlip, thrust washer
- Surface Treatment: Deburring, anti-rust oil coating
- Storage Requirement: Dry and ventilated storage, protect the grinding surface from scratch and corrosion

▪ Made of high-quality alloy structural steel, with reasonable matching of surface hardness and core toughness. The outer working surface is wear-resistant, while the core retains good toughness, effectively resisting impact and shear force, and avoiding brittle fracture under sudden heavy impact.
▪ Adopt high-precision cylindrical grinding process, the outer circle has low surface roughness and stable dimensional tolerance. It forms a reasonable clearance fit with the matching bushing, rotating smoothly, reducing friction heat generation and slowing down the wear rate of pin and bushing pair.
▪ Built-in oil passage and oil groove design, grease can be evenly distributed along the contact surface after filling lubricating grease, forming continuous oil film lubrication, effectively reducing dry friction and local sintering and seizure risks.
▪ Standard B-type structure fully consistent with original drawing, the limit step, oil hole position and overall length all match the original assembly structure. Direct press-fit assembly is available, without turning, grinding or cutting modification on site.

FAQ 

Q1: What is the function of this B-type pin?
A1: It is the hinge rotating connecting piece of the working device, used to connect boom, cylinder and frame, transfer load and realize flexible relative rotation of the working mechanism.

Q2: When do we need to replace the hinge pin?
A2: Replace it when the outer circle is severely worn, deep scratch, out-of-tolerance diameter, pin bending, fracture or long-term seizure.

Q3: Can this B-type pin be used for other loader models?
A3: It is specially developed for ZL50G and ZL50GL. Installation on other models is not recommended before checking drawing and matching size.

Q4: What should be noticed during installation?
A4: Clean the pin hole and bushing inner wall, remove iron scraps and impurities; apply grease before installation; avoid forced hammering to prevent surface damage.

Q5: How to maintain the pin after installation?
A5: Fill lubricating grease regularly according to maintenance cycle, keep the oil passage unblocked, check the hinge clearance periodically.

Q6: Can a slightly worn pin continue to be used?
A6: Minor uniform wear within the tolerance range can be monitored for continued use. If the wear exceeds the limit, it must be replaced in time to avoid secondary damage.

Q7: Why does the pin seize?
A7: Insufficient or deteriorated lubricating grease, oil channel blockage, excessive assembly preload, sand and mud entering the friction clearance.