The 380600522 Spacer is a genuine XCMG precision-machined component used in motor grader wheel hubs and final drives. This spacer ensures correct bearing preload and axial positioning of rotating assemblies. The 380600522 spacer is manufactured from high-strength carbon steel with a hardened ground finish, providing consistent thickness and parallel faces. It is a critical component for maintaining proper gear mesh and bearing life on GR series graders.
The 380600522 Spacer is manufactured to ISO 2768-m tolerance class, with a thickness tolerance of ±0.02mm and surface flatness within 0.01mm. The spacer has a nominal outer diameter of 85mm, inner diameter of 65mm, and thickness of 12.5mm. It is designed to fit between the wheel bearing cones and the hub shoulder, providing the exact shim adjustment for factory-specified end play. As a genuine XCMG part, it matches the original material hardness and dimensional specifications exactly.
Engineered for durability, the 380600522 Spacer is case-hardened to HRC 45-50 to resist wear from bearing races. The faces are precision-ground to a mirror finish (Ra 0.4 µm) to ensure even load distribution. Each spacer is 100% inspected for thickness, parallelism, and hardness. Using OEM spacers prevents incorrect bearing preload that can lead to premature bearing failure, axle play, and uneven tire wear.
| Parameter | Specification |
|---|---|
| OEM Number | 380600522 |
| Product Name | Spacer (Bearing Adjustment Shim) |
| Brand | XCMG (Genuine OEM) |
| Material | Carbon steel (C45 / AISI 1045), case-hardened |
| Outer Diameter | 85.00 mm (±0.05 mm) |
| Inner Diameter | 65.00 mm (±0.05 mm) |
| Thickness | 12.50 mm (±0.02 mm) |
| Surface Hardness | HRC 45–50 (case depth 0.8–1.0mm) |
| Core Hardness | HRC 25–30 |
| Flatness | ≤ 0.01 mm |
| Surface Finish | Ground, Ra ≤ 0.4 µm |
| Corrosion Protection | Phosphate coating + oil film |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR300, GR350 |
| Warranty | 12 months / unlimited hours |
Aftermarket spacers often use low-grade steel with inconsistent thickness, leading to incorrect bearing preload and rapid failure. The genuine 380600522 Spacer from XCMG is precision-ground to exact factory specifications. Independent tests show that OEM spacers maintain thickness within 0.02mm across all production batches, while generic parts can vary by up to 0.2mm. This precision is critical for setting bearing end play correctly, preventing overheating and seizure.
Each 380600522 Spacer is traceable to its heat treatment batch, with records of hardness and flatness measurements. The part is laser-etched with the XCMG part number for easy identification. XCMG’s quality system includes 100% dimensional inspection using a coordinate measuring machine (CMM). Only spacers that meet all tolerance criteria are packaged for shipment, ensuring consistent quality for every customer.
Installing the 380600522 Spacer requires careful cleaning of the hub and bearing surfaces. Remove any burrs or old sealant. Place the spacer onto the spindle or hub shoulder, ensuring it sits flat. Use a depth micrometer to measure the distance from the spacer face to the bearing seat. The calculated preload must match the service manual specification (typically 0.05–0.15 mm end play). Do not stack multiple spacers; use a single precision spacer for best results.
Inspect the 380600522 Spacer during wheel bearing repacks (every 2,000 hours). Look for signs of galling, pitting, or wear on the faces. If the spacer shows any discoloration or scoring, replace it immediately. When replacing bearings, always install a new spacer of the same thickness. Store spare spacers in a clean, dry area, protected from moisture. Keep a set of common thicknesses (12.0, 12.5, 13.0 mm) in your parts inventory.
A worn or incorrect spacer allows axial movement of the wheel hub, causing brake rotor runout, uneven tire wear, and bearing noise. The genuine 380600522 Spacer restores proper bearing clamping force, eliminating play and extending bearing life by up to 50%. Operators report smoother steering, reduced vibration, and quieter operation after replacing worn spacers. The hardened surface also prevents brinelling of the bearing race.
In a controlled fleet study of 25 XCMG GR215 graders, those fitted with genuine 380600522 Spacers during hub overhauls achieved 8,000 hours of bearing life compared to 4,500 hours for machines using aftermarket spacers. The improved preload consistency also reduced brake pad knockback and improved pedal feel. For contractors who prioritize low maintenance costs, OEM spacers are a proven investment.
XCMG’s precision machining center uses double-disc grinding technology to produce the 380600522 Spacer with parallel faces within 0.01mm. The steel blanks are cut from seamless tubing, then heat-treated in a vacuum furnace to prevent oxidation. After hardening, the spacers are cryogenically treated to stabilize the microstructure, eliminating distortion over time. Final lapping achieves a mirror finish on both faces.
All 380600522 Spacers are individually packed in anti-corrosion paper and sealed in plastic bags. Boxes of 5 or 10 spacers are available for fleet maintenance. Each box includes a certificate of conformance with the hardness and dimension data. XCMG’s global supply chain ensures fast delivery to any location, with emergency air freight available through the contact buttons above.
The 380600522 Spacer directly replaces original part numbers 380600521 and 380600523. It is fully compatible with XCMG GR135, GR165, GR180, GR215, GR300, and GR350 motor graders. This spacer is used on both front and rear wheel hubs, as well as the tandem drive axles on all-wheel-drive models. For GR550 models, use part 380600524. Always verify the required thickness by measuring the original spacer or consulting the service manual.
When rebuilding a hub, also order new wheel bearings (part 380600525), seals (380600526), and axle nut (380600527). XCMG recommends replacing the spacer every second bearing change, or immediately if any wear is visible. Keep a selection of spacers in 0.5mm increments to fine-tune bearing preload during assembly. For bulk orders of 20 or more spacers, a 15% discount applies.
For custom thicknesses (e.g., 13.0mm or 14.0mm), use the buttons above to contact our engineering team. We can produce spacers in any increment from 8mm to 25mm with the same hardness and finish. Always provide your grader’s serial number and the measured housing depth when ordering the 380600522 Spacer to ensure correct fitment.
