The Wheel Loader Loader Arm Bushing is a critical wear component installed at the pivot points of the loader arm lift cylinder and bucket linkage assemblies. This bushing serves as a bearing surface between the pivot pin and the loader arm structure, absorbing lateral loads, reducing friction, and enabling smooth articulation of the loader arm during loading and dumping cycles. In heavy-duty wheel loaders operating in quarries, mines, and construction sites, these bushings are subjected to severe impact loads, abrasive contamination, and high contact pressures.
Ningbo Ruican manufactures wheel loader arm bushings using the silica sol Investment Casting process, which produces bushings with uniform wall thickness, consistent material density, and the ability to incorporate internal lubrication grooves, oil passages, and flange features in a single cast component. The investment casting method eliminates the porosity and inclusion risks associated with continuous-cast bar stock, ensuring superior wear resistance and longer service life in demanding applications.
Post-casting, each bushing is precision CNC turned and bored to achieve tight tolerances on the inner diameter (pin contact surface) and outer diameter (housing fit). Bushings can be supplied with oil-impregnated bronze inserts, graphite plugs, or solid-lubricant embedded surfaces for self-lubricating applications where grease access is limited. Our integrated casting and machining facility serves construction machinery OEMs, aftermarket parts distributors, and fleet maintenance operators worldwide.
Material Specifications
| Parameter | Specification |
|---|---|
| Material Grade | ZCuAl10Fe3 (Aluminum Bronze, ASTM B148 C95400) / ZCuZn25Al6Fe3Mn3 (High-Strength Brass) |
| Casting Process | Silica sol investment casting (lost wax) |
| Casting Tolerance | ISO 8062 CT4-CT5 (as-cast); machined to IT6-IT7 |
| Weight Range | 0.5–8 kg per unit |
| Surface Finish | Ra 3.2 μm (as-cast); Ra 0.8 μm (bore and OD) |
| Heat Treatment | Solution treatment and aging (for aluminum bronze) |
| Non-Destructive Testing | Liquid penetrant inspection (PT) per ASTM E165 |
| Tensile Strength | ≥ 586 MPa (C95400 aluminum bronze) |
| Yield Strength | ≥ 221 MPa (C95400) |
| Elongation | ≥ 12% (C95400) |
| Hardness | 170–210 HBW (C95400) |
| Wear Resistance | Superior galling resistance; suitable for steel-on-bronze bearing pairs |
CNC MACHINING Details
| Machining Feature | Specification |
|---|---|
| Inner Diameter (Pin Bore) | Custom per drawing (typ. Ø40–Ø120 mm) |
| Inner Diameter Tolerance | H7 (machined and honed) |
| Outer Diameter (Housing Fit) | Custom per drawing |
| Outer Diameter Tolerance | p6 (interference fit) or h7 (clearance fit) |
| Bush Length | Custom per drawing (typ. 50–200 mm) |
| Lubrication Grooves | Axial, circumferential, or figure-of-eight pattern per drawing |
| Oil Hole | Drilled and chamfered per drawing |
| Surface Treatment | Optional chrome plating (OD) or tin plating (bore) |
Applications
- Wheel loader loader arm pivot points (5-ton to 50-ton class)
- Excavator boom and arm cylinder pivot bushings
- Bulldozer track adjuster and equalizer bar bushings
- Articulated truck suspension pivot bushings
- Backhoe loader boom and dipper pivot points
- Grader moldboard and circle drive bushings
Quality Assurance
- IATF 16949 certified quality management system
- 100% bore and OD dimensional inspection
- Surface hardness verification on every batch
- Material certification with chemistry and mechanical properties (3.1 per EN 10204)
- Wear test data available upon request
- Custom packaging options for OEM supply chains
Call to Action
Need heavy-duty bushings that outlast the competition? Ningbo Ruican offers custom investment-cast and CNC-machined loader arm bushings for all major wheel loader models. Send your drawings, part numbers, or worn samples for a rapid quotation.
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