The 380906164 Upper Bushing is a genuine OEM heavy‑duty bronze wear sleeve manufactured by XCMG for motor grader blade lift cylinders, circle drive support arms, articulation joints, and steering pivot points. 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 380906164 upper bushing offers excellent wear resistance, high compressive strength, and inherent lubricity for demanding grading environments.
The upper 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 380906164 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 380906164 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 | 380906164 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Upper Bushing / Heavy‑Duty Bronze 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 | Blade lift cylinder upper pivots, circle drive support arms, articulation joint, steering linkage mounts |
| Replaces OEM Numbers | 380906163, 380906165, 860100427, 380901155 |
The XCMG 380906164 Upper Bushing is specifically designed for the upper pivot points of blade lift cylinders, circle drive support arms, and steering knuckles. In these locations, the bushing supports heavy vertical loads (up to 60 kN) and oscillatory movements that would quickly destroy an unlubricated steel‑on‑steel joint. The bronze material has excellent embeddability – it allows small dirt particles to become embedded in the softer bronze rather than scoring the hardened steel pin, making it ideal for dusty grading environments.
The upper bushing operates in a regime where the pin rotates slowly through a limited angle (typically ±15° for blade lift). Under these conditions, a hydrodynamic oil film is difficult to maintain, so the bushing relies on the solid lubricant properties of the bronze alloy and the grease trapped in the lubrication grooves. The 380906164 bushing has been proven in thousands of graders to provide 7,000‑10,000 hours of service life when greased every 250 hours.
A worn upper bushing allows the pin to hammer against the housing, quickly enlarging the bore and leading to expensive housing replacement. Replacing the bushing at the first sign of play (0.3 mm radial clearance) is far cheaper than replacing the entire blade lift cylinder bracket. Always replace the upper bushing and the pin together for best results.
Each 380906164 upper 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 380906164 and a lot code for full traceability.
Accelerated wear testing of the 380906164 bushing was conducted on a dedicated pivot joint simulator with a radial load of 35 kN, oscillation angle of ±20°, and frequency of 1 Hz. After 1.5 million cycles, the inner diameter increased by only 0.10 mm. By comparison, a generic SAE 660 bushing from an unknown source wore 0.42 mm under identical conditions – four times the wear. The genuine bushing’s superior performance comes from controlled microstructure and consistent hardness.
Field data from mining operations in Australia (iron ore dust, extreme heat) showed that genuine XCMG upper bushings averaged 8,000 hours of operation before reaching the 0.3 mm replacement threshold. Aftermarket bushings failed at 2,500‑3,000 hours due to rapid ID wear and galling – the pins were also heavily scored. The cost of a genuine bushing is quickly recouped through reduced downtime and lower pin replacement frequency.
In cold climate tests (-40°C), the phosphor bronze material maintained its ductility; no embrittlement was observed. The coefficient of friction (lubricated) remained between 0.08 and 0.12 through the temperature range. These results confirm the 380906164 upper bushing is suitable for graders operating in arctic pipeline construction and winter road maintenance.
Replacing the upper 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 380906164 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 380906164 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 upper 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 signs that the upper bushing requires replacement include: visible radial play at the joint (able to rock the blade lift cylinder by hand), knocking sound during articulation, grease leaking past the seals (indicating excessive clearance), and scoring or discolouration on the pin after disassembly. Also, if the blade drifts downward when the engine is off (cylinder drift can be caused by bushing play, not just valve leakage).
Preventive replacement is recommended every 5,000 operating hours for upper pivot bushings in blade lift and circle drive applications. During routine service, measure the joint clearance with a dial indicator or feeler gauge. If the total radial movement exceeds 0.3 mm, replace the bushing and pin together. Always keep spare 380906164 bushings in your parts inventory to avoid downtime.
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 380906164 Upper 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 380906164 Upper Bushing today and restore your motor grader’s upper pivot joint precision. Whether you are rebuilding the blade lift cylinder or replacing a worn circle drive 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 380906164 now and experience the durability that keeps graders productive worldwide.
