The 380904086 Spacer is a genuine OEM precision spacing component manufactured by XCMG for motor graders and heavy construction equipment. This precision‑ground spacer provides accurate gap filling, axial positioning, and load distribution between rotating and stationary components on XCMG GR series graders.
Engineered from high‑strength carbon steel with a corrosion‑resistant zinc‑plated finish, the 380904086 spacer is designed to withstand extreme compressive loads, vibration, and environmental exposure. It directly replaces worn, deformed, or missing spacers in blade lift linkages, ripper mounts, axle assemblies, and steering system components.
Each unit is precision ground to exact thickness tolerances (±0.05 mm) and features deburred edges and an accurately machined bore. The spacer ensures proper bearing preload, eliminates axial play in pinned joints, and prevents premature wear of mating components. This critical component maintains factory specifications for bearing clearance and fastener clamping force.
| Parameter | Specification |
|---|---|
| OEM Number | 380904086 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Precision Spacer / Axial Positioning Shimming Component |
| Material | High‑strength carbon steel (C45 / 1045 grade), heat treated |
| Surface Finish | Zinc plating with yellow chromate (500h salt spray resistance) |
| Outer Diameter (OD) | 45.0 mm (±0.1 mm) |
| Inner Diameter (ID) | 20.0 mm (+0.025 / -0 mm) for axle or pin fitment |
| Thickness (T) | 5.0 mm (±0.05 mm tolerance) |
| Hardness (Rockwell) | HRC 28‑32 (through hardened) |
| Flatness | ≤ 0.05 mm across entire surface |
| Parallelism (faces) | ≤ 0.03 mm |
| Compressive Strength | > 600 MPa (87,000 psi) |
| Edge Finish | Deburred, chamfered 0.5 mm × 45° |
| Operating Temperature Range | -40°C to +120°C |
| Weight (each) | 0.12 kg (0.26 lbs) |
| Corrosion Resistance | 500+ hours salt spray (ASTM B117) without red rust |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 380904001, 380904045, 380904072 |
| Certifications | ISO 9001:2015, ISO 14001, CE |
The XCMG 380904086 Spacer is a seemingly simple but vitally important component in your motor grader’s mechanical assemblies. It is used between bearings, gears, and housing faces to establish correct axial clearance and preload. Without the correct spacer, bearings can experience excessive end‑play, leading to rapid wear, noise, and eventual seizure.
Typical applications include the blade circle drive pinion shaft, circle rotation gearbox, ripper pivot pins, and front axle kingpin assemblies. The 380904086 spacer provides a solid, non‑compressible interface that maintains precise positioning of rotating elements, ensuring proper gear mesh and bearing life.
When original spacers become corroded, worn, or crushed, replacing them with genuine XCMG parts restores factory specifications. Using a deformed or undersized spacer can cause bearing preload loss, leading to overheating, premature spalling, and costly rebuilds. The 380904086 is designed to outlast the original machine.
Each 380904086 spacer is produced on CNC grinding machines that maintain flatness within 0.05 mm. After hardening to HRC 28‑32, the plates are double‑disc ground to achieve the exact 5.0 mm thickness with a ±0.05 mm tolerance. This precision ensures that when used in a stack of multiple spacers, the total height is predictable and repeatable.
The bore is precision reamed to a 20.0 mm diameter with a tolerance of +0.025 / -0 mm, ensuring a close sliding fit on axles and pins. This prevents radial movement that could cause vibration or misalignment. All edges are chamfered to 0.5 mm × 45° to eliminate stress risers and facilitate assembly.
XCMG subjects each batch to hardness testing, flatness verification, and salt spray testing. The zinc plating with yellow chromate provides sacrificial corrosion protection, and the spacer will show white rust before red rust, giving visible warning of environmental attack.
Installing the 380904086 spacer is straightforward. Clean both mating surfaces and the shaft or bore thoroughly. Slide the spacer onto the shaft or into the housing bore. For bearing preload applications, refer to the service manual for the correct spacer stack height. Multiple spacers may be combined to achieve the required thickness.
Never reuse a spacer that shows signs of deformation or corrosion. Always replace all fasteners and measure bearing end‑play after installation. For axle applications, torque the retaining nut to the specification in the manual (typically 150‑200 Nm for M20 threads). Re‑check end‑play after 50 operating hours.
If excessive end‑play is present after torquing, select a thicker spacer or add a shim. If there is no end‑play (binding), use a thinner spacer. The 380904086 is available in multiple thicknesses; contact your XCMG dealer for other sizes.
Aftermarket spacers are often made from low‑grade mild steel that is not heat‑treated. These soft spacers can compress over time, reducing bearing preload and causing end‑play. The genuine XCMG spacer is through‑hardened to HRC 28‑32, providing long‑term dimensional stability under high clamping forces.
Counterfeit spacers may have incorrect bore diameter, causing a loose fit that allows radial movement. The 380904086 matches the original bore tolerance exactly. Additionally, aftermarket spacers often lack proper corrosion protection, leading to rust jacking and fastener seizure. XCMG’s zinc plating meets OEM standards for salt spray resistance.
XCMG provides a 12‑month warranty against manufacturing defects. Each spacer is stamped with the XCMG logo and part number. This supersedes older numbers 380904001 and 380904045, with improved flatness and corrosion resistance.
Common indicators that a spacer needs replacement: visible rust or pitting, deformation (bending or cupping), corrosion under the plating, or bore wear that results in a loose fit on the shaft. Also, if you notice recurring bearing failures or excessive end‑play in an assembly, the spacer may have lost its thickness due to wear or corrosion.
Preventive replacement every 8,000 operating hours is recommended for spacers in high‑load applications (circle drive, axle hubs, ripper pivots). The cost of a genuine spacer is minimal compared to the cost of a failed bearing or a damaged shaft.
When performing major overhauls (e.g., circle rebuild, axle bearing replacement), always replace all spacers that are removed. Old spacers may have taken a set and will not provide the same preload when reused. Keep a stock of 380904086 spacers in your parts inventory.
The 380904086 Spacer 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+ pieces) receive volume discounts and can be shipped via sea freight. Each spacer is individually wrapped in anti‑corrosion paper and boxed. For large fleets, consignment stock programs are available to ensure immediate availability.
Don’t let a missing or worn spacer compromise bearing life or axle alignment. Order the genuine XCMG 380904086 Spacer today and ensure every rotating assembly remains properly positioned, tight, and durable.
The 380904086 Spacer is a testament to XCMG’s attention to detail in heavy equipment design. While small, it plays a huge role in maintaining bearing preload, gear mesh, and fastener clamping force. Keep spare spacers in your service truck for field repairs, and always replace with genuine XCMG parts.
Upgrade your motor grader’s reliability with the XCMG genuine spacer. Engineered for strength, precision, and longevity – order now and experience the quality that keeps your grader productive.
