The 380800260 Upper Spacer is a genuine OEM precision thickness spacer manufactured by XCMG for motor grader final drive assemblies, steering knuckle kingpin bearings, and gearbox shaft positioning. This precision‑ground spacer ring is designed to maintain accurate axial clearances between upper bearings and housings on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑strength carbon steel with a corrosion‑resistant phosphate coating, the 380800260 upper spacer withstands heavy compressive loads, vibration, and temperature cycling in demanding grading environments.
The spacer is a flat, annular ring with parallel ground faces that provide precise thickness control. It is placed between the upper taper roller bearing cup and the housing shoulder, or between gear faces and spacers, to take up excess axial clearance and set bearing preload. The 380800260 spacer is essential for final drive overhauls, steering knuckle rebuilds, and differential adjustments. An incorrect spacer thickness can cause improper bearing preload, leading to overheating, gear noise, or seizure. Replacing a damaged or compressed spacer with the genuine XCMG 380800260 restores factory clearances, eliminates free play, and ensures reliable operation.
Proper upper spacing is critical for motor grader driveline and steering systems. An incorrect thickness can cause catastrophic bearing failure or gear tooth damage. Always choose original XCMG for exact thickness, hardness, and dimensional accuracy.
| Parameter | Specification |
|---|---|
| OEM Number | 380800260 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Upper Spacer / Precision Axial Spacer / Thick Washer |
| Material | High‑strength carbon steel (C45 / 1045), cold‑rolled, stress‑relieved |
| Thickness (nominal) | 1.0 mm – 6.0 mm (application‑specific; multiple variants) |
| Thickness Tolerance | ±0.02 mm (precision ground) |
| Outer Diameter (OD) | Application‑specific: typical 50 mm – 140 mm |
| Inner Diameter (ID) | Application‑specific: typical 30 mm – 90 mm |
| Surface Finish | Phosphate coated (black) or zinc‑plated – 240h salt spray (ASTM B117) |
| Flatness (max deviation) | ≤ 0.02 mm (ground faces) |
| Hardness (HRB) | 75‑85 (as‑rolled) or case‑hardened to HRC 35‑40 on request |
| Compressive Strength | ≥ 500 MPa (no deformation under rated load) |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Standards Compliance | ISO 4755, GB/T 97.1, XCMG Q/XCMG 021-2025 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 |
| Typical Applications | Final drive upper bearing preload, steering knuckle kingpin upper bearing, gearbox shaft positioning |
| Replaces OEM Numbers | 380800259, 380800261, 860100483, 380901170 |
The XCMG 380800260 Upper Spacer is used in final drive assemblies to set the preload of the upper taper roller bearing. Correct preload is essential: too little preload causes the bearing to hammer and wear rapidly; too much preload leads to overheating and seizure. The spacer’s precise thickness allows the mechanic to achieve the required end‑play (typically 0.05‑0.15 mm) without guesswork. This spacer is also installed in steering knuckles above the kingpin bearing, controlling the vertical clearance of the wheel spindle.
In differentials and gearboxes, the upper spacer positions the side gears or shafts relative to the housing. An incorrect spacer thickness can cause improper gear mesh, resulting in whine, clunking, or rapid tooth wear. The 380800260 spacer is designed to be stacked – multiple spacers can be combined to achieve a total thickness not available as a single piece. Genuine XCMG spacers have consistent thickness and parallel faces, ensuring even load distribution across the bearing race.
Homemade or aftermarket spacers often have uneven surfaces, causing localised stress and premature bearing failure. Using a genuine XCMG spacer eliminates assembly errors. Always measure the spacer thickness with a micrometer before installation and record the value for future reference.
Each 380800260 upper spacer is blanked from high‑quality carbon steel strip, then surface‑ground on both faces to achieve a thickness tolerance of ±0.02 mm. The grinding process also ensures parallel faces within 0.01 mm. After grinding, the spacer is deburred and stress‑relieved to prevent warping. The edges are chamfered to avoid damaging O‑rings, seals, or bearing rollers during assembly.
The surface is then phosphated (black) or zinc‑plated for corrosion resistance. The coating is only 5‑10 µm thick, so it does not affect the spacer’s thickness. Quality control includes 100% dimensional inspection (thickness, OD, ID, parallelism), sample hardness testing, and visual inspection for burrs. Each batch is also tested for flatness using a granite plate and dial indicator.
Aftermarket spacers are often cut from sheet metal without grinding, resulting in thickness variations of ±0.1 mm or more. This can significantly alter bearing preload or gear backlash. The genuine XCMG spacer’s precision ensures that the mechanic can trust the thickness marked on the packaging. XCMG provides a 12‑month warranty against manufacturing defects.
Compression testing of the 380800260 spacer under a load of 120 kN showed no permanent deformation (less than 0.005 mm thickness reduction). Aftermarket spacers made of unhardened low‑carbon steel compressed by 0.12 mm under the same load, reducing bearing preload by 25% and causing premature failure in field tests. Vibration testing (10‑200 Hz, 2g RMS) caused no loosening or fretting of the spacer.
Field data from GR215 graders operating in mining environments showed that final drives rebuilt with genuine XCMG spacers maintained correct bearing preload for over 10,000 hours. Differentials rebuilt with aftermarket spacers required readjustment after 3,000 hours due to spacer compression. The genuine spacer’s consistent thickness and flatness also simplified assembly, reducing rebuild time by 20%.
Corrosion tests on the phosphate coating showed no red rust after 240 hours of salt spray. In coastal operations, the spacer remained free of rust for the life of the assembly. Counterfeit spacers with no coating rusted within 6 months, causing the spacer pack to expand and alter preload.
Replacing the upper spacer requires disassembly of the final drive or steering knuckle. Remove the old spacer and measure its thickness with a micrometer; note the total thickness of the pack. Clean the bearing seat and housing shoulder thoroughly. Install the new 380800260 spacer(s) in the correct orientation, ensuring that burrs face away from bearings. For stacked spacers, alternate the burr sides if necessary.
Torque the retaining nut to specification, then measure the end‑play or backlash using a dial indicator. If the end‑play is out of specification (e.g., >0.15 mm for taper roller bearings), disassemble and adjust the spacer pack. Do not reuse old spacers that show signs of compression (visible indentations or thinning). Always use new genuine XCMG spacers for critical adjustments.
Preventive replacement: replace spacers whenever bearings or gears are replaced. During routine inspection (every 2,000 hours), measure the component’s end‑play; if it exceeds the service limit, check the spacer pack for wear. Keep a small assortment of common thicknesses (0.5, 1.0, 1.5, 2.0 mm) in your parts inventory. Store spacers in a clean, dry environment, protected from rust.
Aftermarket spacers are often made from low‑grade steel with poor thickness control, leading to incorrect bearing preload and premature failure. The genuine XCMG 380800260 is precision‑ground to exact thickness, with parallel faces that distribute load evenly. The phosphate coating prevents rust and ensures the spacer remains dimensionally stable over time.
Counterfeit spacers may have sharp burrs that damage bearing races or seals. The genuine spacer is deburred and edge‑broken. Using genuine spacers also protects the grader’s warranty; incorrect preload caused by a non‑OEM spacer is not covered. Always verify the OEM number 380800260 stamped on the spacer or on the packaging.
For fleet operators, standardising on genuine XCMG spacers ensures consistent rebuild quality and reduces downtime. The extra cost is negligible compared to the cost of a bearing failure or a final drive rebuild. XCMG also offers spacer kits with a range of thicknesses for field adjustments. Contact your dealer.
Common signs that the spacer pack may need replacement include: excessive end‑play in a bearing (detectable by trying to rock the wheel or shaft), gear whine or clunking, oil leakage due to bearing misalignment, and visible indentation or scoring on the spacer faces after disassembly. Also, if the spacer shows signs of rusting that has increased its thickness, it must be replaced.
During routine service (every 2,000 hours), check the backlash or end‑play of final drives and steering knuckles. If the measurement has changed from the original setting, disassemble and inspect the spacer pack. Replace any spacers that are worn, corroded, or compressed. Keep a log of spacer thicknesses used in each component.
Store spare spacers in a clean, dry cabinet, preferably in the original sealed bags. Do not stack heavy items on top of them. If spacers have been stored for more than 12 months, inspect for corrosion before use. Light surface discolouration is acceptable, but red rust means discard.
The 380800260 Upper Spacer 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 urgent repairs. Bulk orders (50+ spacers) receive volume discounts and can be shipped via sea freight.
Each spacer is individually wrapped in VCI paper, or supplied in sets of 5 or 10 per sealed bag. The packaging includes the OEM number 380800260, thickness marking, and lot code. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for thickness selection and preload calculation.
Order the genuine XCMG 380800260 Upper Spacer today and set your motor grader’s bearing preload and gear backlash precisely. Whether you are rebuilding a final drive or adjusting a steering knuckle, XCMG delivers the quality and exact thickness you need. Don’t risk premature bearing failure with uncertain spacers – choose XCMG original.
Upgrade your motor grader’s reliability with XCMG genuine upper spacers. Engineered for precise thickness, consistent flatness, and corrosion resistance – order the 380800260 now and experience the durability that keeps graders productive worldwide.
