The 380900935 Adjustment Shim is a genuine OEM precision thickness shim manufactured by XCMG for motor grader bearing preload settings, gear backlash adjustments, and pivot joint clearance control. This high‑accuracy stamped steel shim is used to achieve proper axial clearance in taper roller bearing assemblies, differential gear sets, and steering knuckle pivots on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑strength spring steel or mild carbon steel with a corrosion‑resistant phosphate or zinc coating, the 380900935 adjustment shim allows mechanics to fine‑tune assembly tolerances to factory specifications in demanding grading environments.
The adjustment shim features a precisely stamped outer diameter, inner diameter, and thickness. The thin metal ring is placed between bearing cups and housing shoulders, or between gear faces and spacers, to take up excess axial clearance. By selecting the correct shim thickness (or stacking multiple shims), the technician can set bearing preload to the required value (typically 0.05‑0.15 mm end‑play or slight preload). The 380900935 shim is essential for differential rebuilds, final drive overhauls, and steering knuckle bearing replacement. Incorrect shimming leads to premature bearing failure, excessive gear noise, or seizure.
Replacing worn or crushed shims with the genuine XCMG 380900935 restores factory‑specified clearances, eliminates free play, and ensures correct gear mesh and bearing life. Aftermarket shims often have inconsistent thickness or poor surface flatness, causing uneven load distribution. Always choose original XCMG for exact thickness, hardness, and dimensional accuracy.
| Parameter | Specification |
|---|---|
| OEM Number | 380900935 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Adjustment Shim / Thickness Shim / Axial Spacer |
| Material | Spring steel (C67S) or low‑carbon steel (DC01) – hardened and tempered for spring applications |
| Thickness (nominal) | 0.10 mm / 0.15 mm / 0.20 mm / 0.50 mm (multiple variants available under OEM cross‑reference) |
| Thickness Tolerance | ±0.01 mm (precision ground or chemically milled) |
| Outer Diameter (OD) | Application‑specific: typical 50 mm – 120 mm |
| Inner Diameter (ID) | Application‑specific: typical 35 mm – 90 mm |
| Surface Finish | Phosphate coated (black) or zinc‑plated (clear or yellow) – 240h salt spray |
| Flatness (max deviation) | ≤ 0.020 mm per 25 mm diameter (ground shims) |
| Hardness (Spring steel variant) | HRC 38‑45 after heat treatment |
| Burr Condition | Deburred on both sides, rounded edges – per ISO 13715 |
| Tensile Strength (min) | ≥ 400 MPa (low‑carbon) / ≥ 600 MPa (spring steel) |
| Yield Strength | ≥ 250 MPa (low‑carbon) / ≥ 500 MPa (spring steel) |
| Operating Temperature | -40°C to +150°C |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 motor graders |
| Typical Applications | Taper roller bearing preload (steering knuckles, final drives), differential gear backlash, pivot joint axial clearance |
| Replaces OEM Numbers | 380900934, 380900936, 860100462, 380901160 |
The XCMG 380900935 Adjustment Shim is an often‑overlooked but critical component for achieving proper bearing preload and gear backlash in motor grader driveline components. In tandem drive final drives, the taper roller bearings that support the axle shaft must be set with a precise axial clearance (or preload) to ensure long service life. If the bearings are too loose, the shaft can move axially, causing uneven gear wear and hammering. If too tight, the bearings overheat and fail. The adjustment shim allows the mechanic to add or remove thickness to achieve the factory‑specified clearance.
In differential assemblies, the adjustment shim is placed between the differential case and the bearing cup to set the backlash of the ring and pinion gear. Incorrect backlash leads to gear whine, clunking, and rapid wear. The 380900935 shim is also used in steering knuckle kingpin bearings, where precise vertical clearance ensures smooth steering without play. Without proper shimming, the grader will have loose or stiff steering, and the front tyres will wear unevenly.
The shim 380900935 is designed to be stacked – two or more shims can be combined to achieve a total thickness not available as a single shim. The shims are made from spring steel to resist crushing and maintain thickness under clamping loads. Unlike homemade shims (cut from soda cans or sheet metal), genuine XCMG shims have consistent thickness and hardness, ensuring that the bearing preload does not change after assembly. Always replace crushed or corroded shims with genuine parts.
Each 380900935 adjustment shim is produced by high‑speed precision stamping from a master die set. The stamping process creates a burr‑free ring with sharp, square edges and precise inner/outer diameters within ±0.05 mm. For spring steel shims, the part is then heat‑treated in a controlled atmosphere furnace to achieve a hardness of HRC 38‑45, followed by tempering to remove residual stresses. For low‑carbon steel shims, the part may be chemically milled or ground to achieve exact thickness.
After stamping and heat treatment, the shims are vibratory finished to remove microscopic burrs and rounded edges. The surface finish is then phosphate coated (black) or zinc‑plated, providing corrosion resistance without affecting the thickness. Each batch is sampled for flatness (checked on a granite surface plate), thickness (measured with a micrometer at 4 points), and hardness (Rockwell). XCMG’s quality control ensures that every 380900935 shim meets OEM specifications. The shim is laser‑marked with the thickness value (e.g., “0.15”) and the OEM number.
Counterfeit shims are often cut from cheap sheet metal without heat treatment; they may be too soft and will compress under bolt torque, altering the preload. Some aftermarket shims have rolled edges or inconsistent thickness, causing uneven load on the bearing. The genuine XCMG shim is flat, hard, and precisely dimensioned, ensuring that the preload setting remains unchanged over thousands of operating hours. XCMG also provides shim kits with a range of thicknesses for field rebuilds.
Laboratory testing of the 380900935 adjustment shim under simulated bearing preload conditions (clamping force 50 kN, temperature cycling -40°C to +120°C, 10,000 cycles) showed no measurable thickness reduction (less than 0.002 mm). The spring steel shim maintained its flatness within 0.01 mm. By comparison, an aftermarket shim made from annealed low‑carbon steel compressed by 0.08 mm under the same load, causing the bearing preload to increase by 30% and leading to overheating in subsequent bearing tests.
Field data from final drive rebuilds on GR215 graders in Australian mining operations showed that differentials shimmed with genuine XCMG shims had consistent ring‑pinion backlash after 8,000 hours of operation (measured within 0.01 mm of initial setting). Differentials shimmed with aftermarket shims required readjustment after 2,000‑3,000 hours due to shim compression. The genuine shim’s hardness and flatness ensured that the bearing preload remained in the optimal range (0.05‑0.10 mm end‑play).
Corrosion tests on the phosphate coating showed no red rust after 240 hours of salt spray (ASTM B117). The zinc‑plated variant exceeded 500 hours. This corrosion resistance is critical when shims are installed in assemblies that may be exposed to moisture or road salt during the grader’s life. Counterfeit shims with no coating rusted within weeks, causing the shim pack to expand (rust volume) and altering preload.
Replacing adjustment shims requires disassembly of the component (e.g., steering knuckle, final drive). After removing the old shims, clean the bearing seat and measure the end‑play or backlash using a dial indicator. Select the required shim thickness from the service manual. For taper roller bearings, a typical procedure involves assembling without shims, measuring the gap, then selecting a shim pack that provides the specified preload (e.g., 0.05‑0.15 mm end‑play). Use a micrometer to verify the thickness of each 380900935 shim before installation.
Install the shims dry (no sealant) on the clean seat, ensuring they are not folded or overlapped. For stacked shims, the burr sides should face each other to minimise local thickness variation. Torque the retaining nut or bolts to specification, then re‑check the end‑play or backlash. If the measurement is out of range, disassemble and adjust the shim pack accordingly.
Preventive replacement: shims should be replaced whenever the associated bearings or gears are replaced. Never reuse shims that have been compressed (visible indentation) or corroded. Keep a small assortment of common thicknesses (0.10, 0.15, 0.20, 0.50 mm) in your parts inventory. XCMG offers shim kits (OEM 380900935‑KIT) containing multiple thicknesses and application instructions. Store shims in a clean, dry environment, protected from moisture and corrosive chemicals.
Aftermarket shims are often stamped from low‑cost materials without proper quality control. They may have inconsistent thickness, soft material, or burrs that affect assembly. The genuine XCMG 380900935 is manufactured from certified spring steel or precision low‑carbon steel, heat‑treated for hardness, and 100% inspected for flatness and thickness. The phosphate or zinc coating prevents corrosion, ensuring that the shim’s thickness does not change due to rust expansion.
Counterfeit shims may cause permanent damage: a shim that is too thick can push the bearing into excessive preload, causing the bearing to run hot and fail in a few hundred hours. A shim that is too thin (or soft) results in loose bearings, leading to gear noise and rapid wear. The cost of a genuine shim is negligible compared to the cost of a failed bearing or differential. Always verify the OEM number 380900935 stamped on the shim or on the packaging.
For fleet operators, standardising on genuine XCMG shims ensures that every rebuild matches the factory specifications, reducing warranty claims and unplanned downtime. XCMG also provides technical support for shim selection and preload calculation. Invest in genuine parts for peace of mind and long‑term reliability.
Common signs that adjustment shims may need replacement include: excessive end‑play in a bearing (felt by trying to rock a wheel or shaft), audible clunking when changing direction, gear whine or howling, and oil leakage due to bearing misalignment. Also, if the shims appear crushed, cracked, or heavily corroded during disassembly, replace them. Always measure the shim thickness with a micrometer; if the thickness has reduced by more than 0.02 mm compared to the marked value, the shim has been compressed and should be discarded.
Preventive maintenance: during major overhauls (every 5,000‑8,000 hours), replace all shims in the differential, final drives, and steering knuckles, even if they appear undamaged. The cost of new shims is minimal compared to the labour and parts required if a bearing fails due to incorrect preload. When replacing bearings, always replace the shims together with the bearings.
Store spare shims in a clean, dry cabinet, ideally in the original sealed packaging. Do not stack heavy items on top of shims to avoid warping. If shims have been stored for more than 12 months, inspect them for corrosion before use. Light surface discolouration is acceptable, but red rust means discard and replace.
The 380900935 Adjustment Shim 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+ shims) receive volume discounts and can be shipped via sea freight.
Each shim is individually wrapped in VCI paper, or supplied in sets of 5 or 10 per sealed bag. The packaging includes the OEM number 380900935, thickness marking, and lot code. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical data sheets with preload calculation examples for various grader components.
Order the genuine XCMG 380900935 Adjustment Shim 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 shims – choose XCMG original.
Upgrade your motor grader’s reliability with XCMG genuine adjustment shims. Engineered for precise thickness, consistent flatness, and corrosion resistance – order the 380900935 now and experience the durability that keeps graders productive worldwide.
