The genuine XCMG 381600374 Spacer Plate is a precision ground, case‑hardened steel shim designed for adjusting and maintaining critical clearances on motor grader circle drawbars, articulation joints, and blade lift pivot systems. This OEM 381600374 spacer plate restores factory geometry by compensating for wear on wear strips, bronze bushings, and mating surfaces. Manufactured from high‑carbon alloy steel (C60) with a heat‑treated, wear‑resistant surface and precise thickness tolerance, the XCMG spacer plate allows service technicians to eliminate excessive play in the circle‑to‑drawbar interface or the articulation lock mechanism. The 381600374 plate is a direct replacement for worn or missing shims on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders.
The spacer plate is typically installed between the upper clamping plate and the circle raceway, or between the articulation joint halves. A missing or undersized spacer causes excessive vertical play, leading to blade bounce, poor grading accuracy, and accelerated wear of circle gear teeth. Replacing with genuine XCMG 381600374 restores proper preload, eliminates rattling, and extends the service life of the circle drive and drawbar components.
This hardened spacer also serves as a load‑distributing pad for high‑stress pivot bolts. XCMG 381600374 ensures even load transfer, reduces bolt loosening, and prevents fretting corrosion between clamped steel parts.
| Parameter | Specification |
|---|---|
| OEM Number | 381600374 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Spacer Plate / Wear Shim / Clearance Shimming Plate |
| Material | High‑carbon bearing steel (C60 / 1060), through‑hardened |
| Hardness (HRC) | 45‑50 HRC (uniform core and surface) |
| Nominal Thickness | 2.00 mm ±0.05 mm (available also 1.0, 1.5, 2.5 mm) |
| Overall Dimensions (L x W) | 140 mm × 70 mm ±0.3 mm |
| Bolt Hole Pattern | 2 holes, Ø10.5 mm, spaced 120 mm center to center |
| Surface Flatness | ≤ 0.05 mm over entire face (lapped finish) |
| Surface Finish (Ra) | ≤ 0.4 µm (ground and polished) |
| Corrosion Protection | Zinc‑nickel plating (360h salt spray) + oil impregnation |
| Compressive Yield Strength | ≥ 1400 MPa (203,000 psi) |
| Operating Temperature Range | -50°C to +180°C |
| Load Capacity (per plate) | 150 kN under uniform clamp load |
| Magnetic Particle Inspection | 100% (crack detection) |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 381600352, 381600360, 381600367 |
The 381600374 spacer plate takes up slack between the circle drawbar and the upper clamping plate. As wear strips and bronze bushings wear, vertical clearance increases, allowing the blade to lift under load.
Without proper shimming, the circle can bounce during grading, causing washboarding and poor surface finish. The spacer plate restores factory preload, keeping the blade firmly on the ground.
In articulation joints, the spacer plate eliminates free play between the front and rear frames, reducing “wandering” and improving steering precision. A worn joint without proper shims leads to accelerated pin and bushing wear.
Each 381600374 spacer plate is blanked from high‑carbon steel strip, then stress‑relieved to remove distortion. Both faces are ground parallel on a Blanchard grinder, achieving flatness within 0.05 mm.
After grinding, plates are through‑hardened in a continuous furnace to 45‑50 HRC, then tempered for toughness. The final lapping operation produces a mirror finish with Ra 0.4 µm, minimizing galling against mating parts.
The zinc‑nickel coating provides sacrificial corrosion protection and acts as a solid lubricant during initial wear‑in. XCMG inspects each plate for thickness using laser micrometers and for flatness using optical flats.
To adjust circle drawbar clearance, loosen the upper clamping plate bolts. Measure the gap between the plate and the circle using a feeler gauge. The target vertical play is 0.5‑1.0 mm.
Select the correct number of 381600374 spacer plates to achieve this clearance. Insert the spacer(s) between the clamping plate and the drawbar. Re‑torque bolts to 180 Nm and re‑check clearance.
For articulation joints, remove the joint pin, clean the faces, and add or remove spacer plates to achieve a slip‑fit with zero axial play when the pin is inserted. Lubricate heavily before reassembly.
Replace the spacer if it becomes permanently deformed (cupping), if the bolt holes elongate, or if the surface shows deep scoring from movement. A worn spacer will not maintain proper preload.
Also replace if you need a different thickness to adjust play – spacers can be stacked, but never use more than three plates per location to avoid bolt stretch.
Check circle drawbar clearance every 1,000 operating hours. If vertical play exceeds 2 mm, install additional 381600374 spacers to bring it back to 0.5‑1.0 mm.
Inspect articulation joints for free play during every lubrication service. Add spacers as needed to eliminate axial movement. A properly shimmed joint will have no detectable play when the machine is on level ground.
Keep a kit of various thickness spacers (1.0, 1.5, 2.0, 2.5 mm) in your parts inventory. The cost is minimal compared to rebuilding a worn circle raceway or replacing an articulation hinge.
Genuine XCMG 381600374 spacer plates are backed by a 12‑month warranty. Regional warehouses in Houston, Rotterdam, Dubai, and Shanghai maintain full thickness ranges for immediate dispatch.
Air freight delivery within 3‑7 business days worldwide. Emergency 24‑48 hour shipping available. Bulk orders (50+ plates) receive volume discounts and sea freight options.
Aftermarket shims are often made from mild steel without heat treatment, quickly deforming and losing preload. Genuine XCMG 381600374 uses hardened bearing steel for permanent dimensional stability. Order genuine today to keep your grader’s clearances within factory specification.
Don’t ignore excessive play in the circle drawbar – it leads to accelerated wear of the circle gear and clamping plates. The 381600374 spacer plate is an inexpensive solution to a potentially expensive problem. Keep spares on hand and shim proactively.
Upgrade your motor grader’s adjustment capability with XCMG genuine spacer plates. Precision ground, case‑hardened, and dimensionally accurate – order the 381600374 Spacer Plate now and maintain tight, vibration‑free circle and articulation joints for thousands of productive hours.
