The 380906181 Lower Bushing is a genuine OEM bronze wear sleeve manufactured by XCMG for motor graders and heavy construction equipment. This precision‑machined bushing, also known as a bronze bearing or lower pivot sleeve, provides a low‑friction, long‑wearing bearing surface for heavily loaded pivot joints on XCMG GR series motor graders. Constructed from high‑strength phosphor bronze (CuSn8) with excellent anti‑galling properties, the 380906181 lower bushing is designed to withstand extreme radial and oscillatory loads in demanding grading environments.
The lower bushing 380906181 is a direct replacement for worn or seized bushings on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Typical applications include the lower pivot of the circle support assembly, the blade lift linkage lower pin, articulation joint lower bearings, and drawbar support pivots. The bushing features a spiral oil groove (or dimple pattern) to retain grease, ensuring continuous lubrication between service intervals.
A worn or extruded lower bushing allows excessive radial play, causing blade drift, poor circle positioning, and accelerated pin wear. Replacing a faulty bushing with the genuine XCMG 380906181 restores original clearances, eliminates play, and protects the supporting structure from fatigue cracks.
| Parameter | Specification |
|---|---|
| OEM Number | 380906181 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Lower Bushing / Bronze Wear Sleeve (Plain bearing) |
| Material | Phosphor bronze – CuSn8 (SAE 660) |
| Inner Diameter (ID) | 60.00 mm +0.05 / -0.00 mm (semi‑finished with machining allowance) |
| Outer Diameter (OD) | 70.00 mm ±0.02 mm (press‑fit into housing) |
| Length | 50 mm ±0.2 mm |
| Tensile Strength (bronze) | ≥ 260 MPa |
| Hardness (HB) | 70 – 85 HB (annealed) |
| Maximum Specific Load (static) | 50 N/mm² |
| Maximum Sliding Speed (greased) | 0.5 m/s (oscillatory) |
| Lubrication Features | Spiral grease groove (2mm wide) + grease inlet hole |
| Operating Temperature Range | -40°C to +120°C |
| Coefficient of Friction (greased) | 0.08 – 0.12 (bronze on steel) |
| Standards | ISO 9001:2024, ASTM B505, DIN 1705 |
| Compatible Models | XCMG GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350 |
| Applications | Circle support lower pivot, blade lift linkage, articulation lower bearing, drawbar support |
The XCMG 380906181 Lower Bushing is a precision component that supports heavily loaded pivot points where misalignment or wear directly affects grading accuracy. Typical applications include the lower pin of the circle support assembly, which allows the moldboard to rotate while bearing the entire load of the drawbar and blade. Without a properly fitted lower bushing, the circle will develop excessive radial play, causing the blade to drift during fine grading.
In the blade lift linkage, the lower bushing supports the blade lift cylinder pin. Wear in this bushing translates directly to blade flop (uncontrolled vertical movement when the blade contacts the ground). The bronze material of the 380906181 is designed to wear preferentially, protecting the more expensive pin and housing from damage. Replacing a worn bushing restores the original tolerance and eliminates movement.
Articulation joint lower bearings also use the 380906181 size. The articulation pin rotates as the grader turns; a seized or worn bushing causes difficult steering and uneven tire wear. The spiral oil groove in the genuine bushing ensures that grease reaches the entire bearing surface, keeping friction low even after thousands of cycles.
Each 380906181 lower bushing is centrifugal‑cast from phosphor bronze (CuSn8) to produce a dense, porosity‑free structure. The casting is then heat‑treated to relieve internal stresses and CNC machined to the final external diameter and length. The inner diameter is left with a machining allowance of 0.10‑0.15 mm to allow final line‑reaming after installation, ensuring perfect fit to the actual pin diameter.
The bushing features a precisely machined spiral groove (or figure‑8 oil channels) that distributes grease from the fitting to the entire contact area. The groove depth is controlled to 0.5 mm – deep enough to retain lubricant but not so deep as to weaken the bushing. After machining, the bushing is deburred and oil‑impregnated for initial lubrication.
XCMG’s quality control includes 100% dimensional inspection of OD, ID, length, groove geometry, and concentricity. Random samples are hardness‑tested (70‑85 HB) and subjected to a load test (50 kN for 5 minutes with no deformation). Only bushings meeting all criteria are accepted for packing under the XCMG Genuine Parts label.
Replacing the lower bushing 380906181 requires removal of the pivot pin and often the drawbar or circle support. Press the old bushing out using a stepped punch, taking care not to damage the housing bore. Clean the bore thoroughly and inspect for scoring or wear. The new bushing is a press fit (interference 0.03‑0.07 mm). Use a bushing driver that contacts the full OD face to avoid distortion.
After pressing the 380906181 bushing into the housing, the inner diameter must be line‑reamed to the final pin dimension. Use a piloted adjustable reamer, set to the exact pin diameter (typically 60.00 mm +0.02 / +0.05 mm clearance). Ream slowly and constantly, removing equal material along the length. Do not oversize; a loose fit will cause hammering and rapid failure.
After reaming, deburr the edges and install the grease fitting. Pump grease until it emerges from the entire groove. Insert the pin – it should rotate freely without perceptible play. If the pin binds, ream additional 0.005 mm increments. Always use a new pin when installing a new bushing to ensure proper mating surfaces.
Aftermarket bushings are often made from inferior sintered bronze that crumbles under load. The genuine XCMG bushing uses centrifugally cast CuSn8, which has excellent wear resistance and embedability (ability to absorb small particles without scoring the pin). Aftermarket bushings may also have incorrect oversize or undersize IDs, making reaming impossible or resulting in a loose fit.
Counterfeit bushings sometimes have no lubrication grooves or have grooves that do not align with the grease passage. The 380906181 has precision‑machined grooves that guarantee grease coverage over the full bearing area. Genuine XCMG bushings are also marked with the part number and XCMG logo for traceability.
XCMG provides a 12‑month warranty against manufacturing defects. Using genuine parts ensures that your grader’s pivot points maintain correct geometry, preventing structural cracks in the circle support and drawbar. Choose the 380906181 genuine lower bushing for long, trouble‑free service.
Common signs that the lower bushing 380906181 needs replacement: excessive radial play (visible movement when lifting the blade), unusual knocking noise when the circle rotates, accelerated pin wear (pin diameter reduced), and grease leaking past the bushing ends. Also, if the bushing has extruded or spun in the housing, immediate replacement is mandatory.
Preventive replacement is recommended every 5,000 operating hours or whenever the associated pin is removed for inspection. The cost of a bushing is small compared to the cost of repairing a cracked circle support or worn casting. Always replace both the upper and lower bushings in pairs for even load distribution.
Store bronze bushings in a dry, covered area to prevent oxidation. The oil‑impregnated finish provides short‑term corrosion protection; long‑term storage may require light oil coating. Shelf life is 10 years when properly stored.
The 380906181 Lower Bushing is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent repairs. Bulk orders (10+ bushings) receive volume discounts and can be shipped via sea freight.
Each bushing is supplied in a corrosion‑inhibiting wrapper with a part number label. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime. Don’t let a worn lower bushing compromise your grader’s circle alignment or blade control.
Order the genuine XCMG 380906181 Lower Bushing today and restore precision to your motor grader’s pivot points. This bushing is an essential component for circle support and blade lift systems. Keep spares in your service inventory and always replace with genuine XCMG parts.
Upgrade your motor grader’s reliability with the XCMG genuine lower bushing. Engineered for strength, low friction, and long wear life – order now and experience the quality that keeps your grader accurate and productive.
