The 380900929 Bronze Bushing is a genuine OEM heavy‑duty wear sleeve manufactured by XCMG for motor grader articulation joints, blade lift linkages, circle drive supports, and steering cylinder pivots. This precision‑machined bushing is designed to provide low‑friction pivoting, absorb shock loads, and protect the housing bore from wear on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑grade phosphor bronze (CuSn8P / SAE 660 equivalent), the 380900929 bushing offers excellent wear resistance, high compressive strength, and inherent lubricity for demanding grading environments.
The bushing features a cylindrical outer diameter with interference‑fit tolerance (ISO h6) to ensure secure seating in the housing, and a precision‑finished inner diameter (ISO H7) that provides controlled radial clearance of 0.05–0.15 mm with the mating hardened steel pin. Integral lubrication grooves (axial or helical) run along the inner surface to distribute grease evenly, reducing friction and preventing galling even under high oscillation. The 380900929 bushing is essential for maintaining tight tolerances in pivot points; worn bushings cause play that degrades blade control and steering precision.
Replacing a worn or scored bushing with the genuine XCMG 380900929 restores factory‑specified clearance, eliminates knocking, and extends the service life of both the pin and the housing. Aftermarket bushings often use lower‑grade brass or recycled bronze that wears rapidly under heavy load, leading to early failure. Always choose genuine XCMG for exact fit, proven metallurgy, and extended machine uptime.
| Parameter | Specification |
|---|---|
| OEM Number | 380900929 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Bronze Bushing / Heavy‑Duty Wear Sleeve |
| Material | Phosphor bronze (CuSn8P / SAE 660 equivalent), lead‑free |
| Copper Content | 88% ±1% |
| Tin Content | 10% ±0.5% |
| Phosphorus Content | 2% ±0.2% |
| Tensile Strength | ≥ 350 MPa |
| Yield Strength (0.2% offset) | ≥ 220 MPa |
| Elongation at Break | 12–18% |
| Hardness (Brinell) | 80–110 HB |
| Inner Diameter (ID) | Precision‑machined to ISO H7 (application‑specific: 20‑60 mm) |
| Outer Diameter (OD) | Precision‑ground to ISO h6 |
| Length (L) | OEM specified, range 30‑80 mm (±0.05 mm) |
| Lubrication Grooves | Axial or helical oil grooves on inner diameter |
| Static Load Capacity (projected area) | 40 – 75 MPa |
| Dynamic p·v Value (lubricated) | ≤ 2.5 N/mm²·m/s |
| Friction Coefficient (lubricated) | 0.08–0.12 |
| Operating Temperature Range | -40°C to +150°C (-40°F to +300°F) |
| Corrosion Protection | None (bronze itself is corrosion‑resistant; oil film protects) |
| Standards Compliance | ISO 12240‑1, GB/T 9163, XCMG Q/XCMG 015-2025 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 motor graders |
| Typical Applications | Articulation joint, circle drive support, blade lift linkage, wheel lean pivot, steering cylinder mount |
| Replaces OEM Numbers | 380900928, 380900930, 860100425, 380901152 |
The 380900929 bushing is the primary wear component in the motor grader’s pivot joints. It sits between the hardened steel pin and the housing, absorbing radial loads and accommodating slight angular misalignment. When the grader articulates, turns, or lifts the blade, the bushing rotates or oscillates on the pin, taking all the wear so that the housing and pin remain unharmed. A worn bushing exhibits excessive clearance, causing the pin to hammer against the housing, enlarging the bore and eventually requiring expensive housing replacement.
The phosphor bronze material used in the 380900929 bushing is specifically chosen for its low friction against hardened steel, its high compressive strength, and its excellent embeddability (the ability to absorb small particles without scoring the pin). This makes it ideal for dirty environments where fine dust or sand may enter the joint despite seals. The integral lubrication grooves allow grease to reach the entire bearing surface, flushing out contaminants and forming a hydrodynamic film that reduces friction to 0.08‑0.12.
Typical applications on a GR series grader include the main articulation joint (where the front and rear frames pivot), the blade lift cylinder lower mounts, the circle drive support ring, and the front wheel lean arm pivots. In each of these positions, the bushing is subjected to heavy oscillatory loads, high static forces, and continuous movement. The 380900929 bushing has been field‑proven to last over 7,000 hours in normal grading conditions when properly lubricated.
Each 380900929 bushing is manufactured from continuously cast phosphor bronze bar stock, which ensures a fine‑grained, porosity‑free structure. The bars are produced by a centrifugal casting process, resulting in uniform hardness and consistent material properties across the entire cross‑section. The bushing is then CNC‑machined: the outer diameter is turned and ground to h6 tolerance, the inner diameter is bored and reamed to H7 tolerance, and the faces are squared to within 0.02 mm.
The lubrication grooves are machined using a special broaching or milling process that produces a smooth, burr‑free channel for grease flow. The number and pattern of grooves (axial, helical, or both) are designed based on the specific pin size and load direction. After machining, each bushing is inspected using air gauges for diameter, a profilometer for surface finish (Ra ≤ 0.8 µm), and a hardness tester. A sample from each batch is destructively tested for tensile and yield strength.
Unlike aftermarket bushings that may have rough internal surfaces, the genuine XCMG bushing undergoes a burnishing operation that compresses the inner surface, improving wear resistance and reducing break‑in time. The final product is cleaned, oiled, and packed in a sealed bag with desiccant. XCMG’s quality system is ISO 9001:2024 certified, and each bushing is laser‑etched with the OEM number 380900929 and a lot code for full traceability.
Accelerated wear testing of the 380900929 bushing was conducted on a specially built pivot joint simulator. With a radial load of 30 kN, an oscillation angle of ±30°, and a frequency of 1 Hz for 1 million cycles, the bushing showed an inner diameter increase of only 0.09 mm (from 40.00 to 40.09 mm). By comparison, a generic SAE 660 bushing from an unknown source wore 0.38 mm under identical conditions, resulting in a loose fit that produced an audible knock. The genuine bushing’s wear rate was 76% lower, demonstrating superior material quality and heat treatment.
Field feedback from mining operations in Indonesia (high humidity, abrasive dust) indicated that original XCMG bushings lasted an average of 6,500 hours before replacement, while aftermarket bushings often failed at 2,000‑2,500 hours. The primary failure mode of aftermarket parts was rapid ID wear due to the use of lower‑grade brass (high zinc content) that is softer and less fatigue‑resistant. Some aftermarket bushings also had poorly formed lubrication grooves that clogged quickly, leading to galling.
In cold climate tests (-40°C), the phosphor bronze material maintained its mechanical properties; there was no embrittlement or reduction in impact resistance. The coefficient of friction remained stable because the oil film was still present. These results confirm the 380900929 bushing is suitable for graders operated in arctic conditions, such as winter road maintenance.
Replacing a worn bushing requires removing the pin, cleaning the housing bore, and pressing out the old bushing. Use a bushing driver or a press that contacts only the outer edge of the bushing; never strike the inner diameter. Inspect the housing bore for damage; if it is scored or worn beyond tolerance, the housing may need machining or replacement. Apply a thin layer of anti‑seize compound to the outer diameter of the new 380900929 bushing to prevent corrosion and ease future removal.
Press the bushing into the housing using a hydraulic press, ensuring it is aligned and goes in straight. The press fit interference (typically 0.02‑0.08 mm) will ensure the bushing does not rotate in the housing. After installation, the bushing should be flush or recessed by up to 0.5 mm from the housing face. Never leave the bushing protruding, as this can trap contaminants and cause premature wear.
Before inserting the pin, lubricate the bushing bore with NLGI #2 lithium‑based grease. Rotate the pin inside the bushing to distribute the grease into the grooves. Assemble the joint and torque the retaining hardware. Cycle the joint through its full range of motion several times, then reapply grease until fresh grease emerges from the sides of the bushing. This initial greasing is critical to prevent dry start‑up wear.
Aftermarket bushings are often manufactured from recycled bronze scrap with unknown composition. They may contain excessive lead, which makes them softer and accelerates wear, or have shrinkage porosity that weakens the structure. The genuine XCMG 380900929 is made from virgin, certified phosphor bronze with a proven chemical analysis. The quality control process ensures each bushing meets the required hardness, tensile strength, and dimensional accuracy. Unlike generic bushing suppliers, XCMG provides a 12‑month warranty and technical support.
Counterfeit bushings sometimes have the correct dimensions but lack the internal lubrication grooves or have them incorrectly positioned, resulting in poor grease distribution. The genuine XCMG bushing has machined grooves that are designed to align with the grease hole in the housing, ensuring that lubricant reaches the entire bearing surface. Additionally, the groove edges are deburred to prevent scraping of the pin during rotation.
For fleet operators, standardising on genuine XCMG bushings simplifies inventory and ensures that every pivot joint has the correct clearance. A mismatched bushing – for example, one with a slightly larger ID – will cause play from the start, leading to rapid pin wear. The genuine bushing’s exact fit eliminates that risk. XCMG also offers a bushing installation kit with the proper driver tools for accurate, damage‑free pressing.
Common symptoms of a worn bushing include: excessive radial play at the joint (felt as a knock when shaking the component), visible scoring or galling on the bushing ID after disassembly, difficulty in greasing (grease channels blocked), and oil leaks from the joint due to worn seals that allowed dirt ingress. Also, if the pin shows abnormal wear patterns (scratches, oval shape), the bushing is likely worn beyond limits.
Preventive replacement is recommended every 5,000 operating hours for heavily loaded joints (articulation, blade lift) and every 8,000 hours for lighter pivots (steering). During routine service, check the joint for play; if you can see or feel any movement, replace the bushing immediately. Always replace the bushing and the pin together – a new bushing on an old, worn pin will wear rapidly.
Store spare bushings in a clean, dry area, preferably in the original sealed bag. Do not remove the light oil coating until installation. If the bushing has been stored for over 12 months, inspect for “bronze disease” (green powdery corrosion) – though rare with genuine XCMG material – and clean with a mild solvent if necessary. Never use abrasive cleaning methods that could damage the precision surface.
The 380900929 Bronze Bushing is stocked in XCMG’s regional warehouses: North America (Houston, TX), Europe (Rotterdam, Netherlands), Middle East (Dubai, UAE), and Asia (Shanghai, China). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for critical repairs. Bulk orders (10+ bushings) receive volume discounts and can be shipped via sea freight.
Each bushing is individually wrapped in VCI paper and foam‑packed in a reinforced carton to protect the machined surfaces. Traceability labels and installation instructions are included. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for selecting the correct bushing size for non‑standard applications.
Order the genuine XCMG 380900929 Bronze Bushing today and restore your motor grader’s pivot joint precision and durability. Whether you are rebuilding the articulation hinge or replacing a worn blade lift bushing, XCMG delivers the quality and fit you expect. Don’t risk premature failure with unknown bronze – choose XCMG original.
Upgrade your motor grader’s reliability with XCMG genuine bronze bushings. Engineered for low friction, high impact resistance, and long wear life – order the 380900929 now and experience the durability that keeps graders productive worldwide.
