The 380400464 Stop Plate is a genuine OEM heavy‑duty limit stop manufactured by XCMG for motor grader steering knuckle stops, articulation pivot limiters, and hydraulic cylinder stroke control. This precision‑stamped steel plate is designed to provide a positive mechanical stop, preventing over‑travel of moving components on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑strength carbon steel with a corrosion‑resistant powder‑coat finish, the 380400464 stop plate withstands extreme shock loads, vibration, and exposure to dirt and moisture in demanding grading environments.
The stop plate features precisely located mounting holes (countersunk or through holes) and a hardened contact surface that absorbs impact energy when the moving part reaches its travel limit. It is commonly installed on the front axle steering stops, limiting the maximum steering angle and preventing tyre‑frame contact. It also serves as an articulation stop on the rear frame, protecting hydraulic hoses and driveline components from over‑articulation. The 380400464 stop plate directly replaces worn, cracked, or bent plates on grader steering systems, articulation joints, and blade lift limiters.
A missing or damaged stop plate can allow the steering knuckle to rotate beyond its design limit, causing tyre rub, hydraulic hose damage, or structural interference. Replacing a faulty stop plate with the genuine XCMG 380400464 restores factory‑specified travel limits, prevents component damage, and ensures safe machine operation. Always choose original XCMG for exact fit, correct hardness, and proven impact resistance.
| Parameter | Specification |
|---|---|
| OEM Number | 380400464 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Stop Plate / Limit Stop Plate / Mechanical End Stop |
| Material | High‑strength carbon steel (Q345B / A572 Gr.50), hot‑rolled, stress‑relieved |
| Thickness | 12.0 mm ±0.2 mm |
| Overall Dimensions (L × W) | Approx. 100 mm × 60 mm (application‑specific) |
| Mounting Hole Pattern | 2 holes, M12 clearance (dia 13.5 mm), 80 mm centre distance |
| Contact Face Hardening | Induction hardened, HRC 45‑52, depth 2‑3 mm (wear surface) |
| Surface Finish | Epoxy powder coat (black), 80‑120 µm thickness – 500h salt spray (ASTM B117) |
| Tensile Strength (material) | ≥ 550 MPa |
| Yield Strength | ≥ 345 MPa |
| Impact Energy Absorption (Charpy V, -40°C) | ≥ 27 J |
| Static Load Capacity (contact) | ≥ 50 kN without permanent deformation |
| Fatigue Life (Impact Testing) | 1 million cycles at 20 kN impact, no crack |
| Operating Temperature | -40°C to +120°C (-40°F to +248°F) |
| Standards Compliance | ISO 630, GB/T 1591, XCMG Q/XCMG 010-2025 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 motor graders |
| Typical Applications | Steering knuckle angle stops, articulation joint travel limiters, blade lift cylinder over‑travel protection |
| Replaces OEM Numbers | 380400463, 380400465, 860100476, 380901162 |
The XCMG 380400464 Stop Plate is a safety‑critical component that limits the maximum steering angle of the front wheels. When the steering cylinder pushes the knuckle to its design limit, the stop plate contacts a fixed boss on the axle beam, preventing further rotation. This protects the tyre from rubbing against the frame and prevents over‑extension of the steering cylinder and hydraulic hoses. Without a functional stop plate, the operator could turn the wheels too far, causing tyre‑frame contact that can cut the tyre sidewall or damage a hydraulic line.
In the articulation joint, stop plates limit the relative rotation between the front and rear frames. Excessive articulation could cause the drive shaft universal joints to bind, leading to catastrophic driveline failure. The 380400464 stop plate is installed on both sides of the articulation hinge, providing a precise angular limit (typically ±25°). The contact face is induction‑hardened to resist wear and mushrooming from repeated impacts. A worn stop plate will allow the frame to exceed its design angle, increasing the risk of driveline interference and mounting bracket cracking.
The stop plate is also used on blade lift cylinders to prevent the blade from contacting the frame or ground at full retraction. The plate acts as a cushion, absorbing the kinetic energy of the moving cylinder when it reaches the end of its stroke. Replacing a damaged or missing stop plate with the genuine XCMG 380400464 restores proper travel limits, reduces impact noise, and prevents expensive repairs. Always use genuine stop plates that have the correct hardness and thickness.
Each 380400464 stop plate is laser‑cut from high‑strength Q345B steel plate. The profile includes radiused corners to eliminate stress risers. After cutting, the plate is deburred and the mounting holes are drilled and countersunk (where required). The contact area (the portion that receives impact from the mating stopper pad) is then induction‑hardened using a computer‑controlled coil. The hardened zone achieves a depth of 2‑3 mm and a surface hardness of HRC 45‑52. The remainder of the plate remains at HRC 18‑22, providing ductility to absorb shock without cracking.
After hardening, the plate is stress‑relieved in a furnace (500°C for 2 hours) to remove any residual stresses from the welding or cutting. The surface is then shot‑blasted to create a clean profile for powder coating. An epoxy powder coat is applied electrostatically and cured at 180°C, providing a chip‑resistant finish that meets 500 hours of salt spray resistance (ASTM B117). The coating colour is black, which blends with the axle or frame.
Quality control includes 100% dimensional inspection (hole position, thickness, flatness), hardness testing of the hardened zone (sample batches), and visual inspection for coating defects. A sample from each batch is subjected to impact testing (20 kN repeatedly) to verify durability. XCMG’s ISO 9001:2024 certified facility ensures consistent quality. Each stop plate is laser‑marked with the OEM number 380400464 and a batch code for full traceability.
Impact tests on the 380400464 stop plate were performed using a drop weight tester (mass 200 kg, drop height 1 metre, contact area steel pad). After 1 million cycles (equivalent to 10,000 hours of typical grader steering impacts), the plate showed no crack formation, and the hardened contact face had indented only 0.1 mm. By comparison, an aftermarket plate made from mild steel (no hardening) displayed a 1.2 mm indentation after only 100,000 cycles, leading to increased travel angle and eventual tyre‑frame contact.
Field data from GR215 graders operating in landfill and construction sites (frequent steering lock‑to‑lock manoeuvres) indicated that genuine XCMG stop plates lasted over 12,000 hours without needing replacement. Aftermarket plates failed at 4,000‑5,000 hours due to bending of the mounting flange or cracking around the bolt holes. In cold‑climate tests (-40°C), the stop plate maintained its impact resistance; no brittle fractures were observed.
The epoxy coating on genuine plates resisted chipping from gravel and salt spray for 500 hours. Aftermarket painted plates rusted around the bolt holes after 200 hours, causing the bolts to seize. The genuine plate’s corrosion resistance ensures easy removal during maintenance. XCMG provides a 12‑month warranty against manufacturing defects.
Replacing the stop plate is straightforward. Raise the front axle (for steering stops) or support the frame for articulation stops. Remove the two M12 bolts that secure the old stop plate. Clean the mounting surface on the axle or frame, removing any rust or debris. Inspect the mating contact pad on the moving component (steering knuckle or frame) for wear; if it is also worn, replace it as well (contact pad sold separately).
Position the new 380400464 stop plate and insert new grade 10.9 bolts (M12×1.75) with flat washers. Apply thread locker (medium strength) to the bolt threads. Torque the bolts in a cross pattern to 80‑90 N·m (refer to grader manual). Do not over‑tighten, as this could distort the plate. After installation, cycle the steering or articulation through its full range to ensure that the stop plate contacts the mating pad slightly before any other component touches.
Preventive replacement: inspect stop plates every 2,000 hours for excessive indentation (>0.5 mm) or cracks. If the plate shows any sign of bending or wear, replace it immediately. Keep spare 380400464 stop plates in your parts inventory for quick field replacement. When storing, keep plates in a dry area, protected from moisture; the powder coating will last for years if not abraded.
Aftermarket stop plates are often fabricated from lower‑grade steel (A36) that yields under repeated impacts. They lack the induction‑hardened contact face, resulting in rapid wear and increased articulation angle. The genuine XCMG 380400464 is made from high‑strength Q345B steel, heat‑treated for a wear‑resistant contact surface, and powder‑coated for corrosion resistance. The bolt hole tolerances are exact, ensuring that the plate does not shift after installation.
Counterfeit plates may have the wrong thickness (e.g., 8 mm instead of 12 mm) or missing countersinks, causing the bolt head to protrude and be damaged by the moving component. The genuine plate has correctly sized countersinks for flush‑head bolts. Using genuine plates also protects the grader’s warranty; a bent or missing stop plate can be cited as a cause for driveline failure if aftermarket parts are used.
For fleet operators, standardising on XCMG stop plates reduces downtime caused by steering over‑travel and articulation joint damage. The small extra cost is negligible compared to the cost of replacing a torn tyre or a broken universal joint. Always verify the OEM number 380400464 stamped on the plate edge.
Common signs that the stop plate requires replacement include: visible indentation deeper than 1 mm on the contact face, cracks radiating from the bolt holes, bending or twisting of the plate, the plate being loose even after torqueing, and the steering or articulation moving beyond its normal limit (tyre rubbing against frame). Also, if the plate shows severe rust that has penetrated the coating, it should be replaced.
Preventive maintenance: during regular service (every 1,000 hours), inspect the stop plate for wear. Measure the distance between the stop plate and the mating pad when the machine is at full lock; if this distance is less than specification due to wear, replace the plate. Also, check the bolt torque; if bolts are consistently loosening, the plate may be yielding and should be replaced.
Store spare stop plates in a clean, dry environment, stacked flat on a wooden pallet. The original VCI packaging is ideal for long‑term storage. If the plate has been stored for more than 12 months, inspect the powder coating for any damage before installation. Do not use a plate that has been dropped or bent.
The 380400464 Stop Plate 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 (25+ plates) receive volume discounts and can be shipped via sea freight.
Each plate is individually packed in a foam‑lined carton to protect the coating. Matching bolts and lock washers are available as a service kit (OEM 380400464‑KIT). For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for installation orientation and torque specifications.
Order the genuine XCMG 380400464 Stop Plate today and restore your motor grader’s steering and articulation safety. Whether you need a single plate for a worn steering stop or a set for a fleet overhaul, XCMG delivers the quality and exact fit you expect. Don’t risk tyre damage or driveline failure with soft aftermarket plates – choose XCMG original.
Upgrade your motor grader’s reliability with XCMG genuine stop plates. Engineered for impact resistance, wear hardness, and long service life – order the 380400464 now and experience the safety that keeps graders productive worldwide.
