The 380300733 Stop Plate is a genuine OEM mechanical limit component manufactured by XCMG for motor graders and heavy construction equipment. This precision‑machined stop plate provides a hard travel limit for hydraulic cylinders, linkage arms, and pivot assemblies on XCMG GR series graders.
Engineered from high‑strength steel with a corrosion‑resistant zinc‑plated finish, the 380300733 stop plate is designed to withstand repeated impact loads, extreme vibration, and environmental exposure. It directly replaces worn, cracked, or deformed stop plates in blade circle rotation mechanisms, ripper lift systems, and articulation joints.
Each unit is precision machined to exact thickness and hole pattern tolerances (±0.1 mm), with deburred edges and a flat contact surface. The stop plate ensures precise mechanical limits, prevents over‑travel of moving components, and protects hydraulic cylinders from bottoming out. This critical safety component maintains factory stroke limits and prevents structural damage.
| Parameter | Specification |
|---|---|
| OEM Number | 380300733 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Stop Plate / Mechanical Travel Limit Plate |
| Material | High‑strength carbon steel (C45 / 1045 grade), heat treated |
| Surface Finish | Zinc plating with yellow chromate (500h salt spray resistance) |
| Overall Length | 120 mm (±0.5 mm) |
| Overall Width | 60 mm (±0.5 mm) |
| Thickness | 12 mm (±0.1 mm) |
| Bolt Hole Pattern | 2 holes, M12 diameter, 90 mm center‑to‑center |
| Hardness (Rockwell) | HRC 28‑32 (through hardened) |
| Flatness of Contact Surface | ≤ 0.1 mm |
| Compressive Strength | > 600 MPa (87,000 psi) |
| Edge Finish | Deburred, chamfered 1.0 mm × 45° |
| Operating Temperature Range | -40°C to +120°C |
| Weight (each) | 0.45 kg (0.99 lbs) |
| Corrosion Resistance | 500+ hours salt spray (ASTM B117) without red rust |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 380300701, 380300712, 380300725 |
| Certifications | ISO 9001:2015, ISO 14001, CE |
The XCMG 380300733 Stop Plate provides a positive mechanical stop for moving components on motor graders. It is typically mounted on the blade circle rotation mechanism, ripper lift arm, or articulation joint to limit travel at the end of the stroke. Without a properly sized and positioned stop plate, hydraulic cylinders can over‑travel, damaging seals, rods, and mounting brackets.
The stop plate absorbs the kinetic energy of the moving assembly at the end of its travel, distributing impact loads over a broad area. This prevents point loading that could crack castings or bend shafts. The 380300733 is designed to withstand millions of impact cycles without deformation or cracking.
When original stop plates become worn, cracked, or corroded, replacing them with genuine XCMG parts restores proper mechanical limits. Using a deformed or missing stop plate can lead to over‑travel, causing hydraulic cylinder failure, structural damage, or unsafe machine behavior. The 380300733 is engineered to outlast the original machine.
Each 380300733 stop plate is produced on CNC milling machines, then surface ground to achieve the exact 12 mm thickness with a ±0.1 mm tolerance. The contact face is finished to a smooth surface (Ra ≤ 1.6 µm) to ensure even load distribution. The bolt holes are drilled and reamed to 12.2 mm diameter with a positional tolerance of ±0.2 mm.
After heat treatment to HRC 28‑32, the plates are inspected for hardness, flatness, and surface defects. The zinc plating with yellow chromate provides sacrificial corrosion protection, and the plate will show white rust before red rust, giving visible warning of environmental attack. All edges are chamfered to eliminate sharp corners.
XCMG subjects each batch to impact testing: a 50 kg weight dropped from 200 mm onto the stop plate for 10,000 cycles with no permanent deformation. This simulates real‑world end‑stop impacts in heavy grading applications.
Installing the 380300733 stop plate is straightforward. Clean both mating surfaces and remove any old gasket material or corrosion. Position the stop plate so that the contact face aligns with the moving component at the end of its stroke. Insert M12 bolts (grade 10.9, not included) and torque to 85 Nm in a cross pattern.
After installation, cycle the hydraulic cylinder or linkage to its extreme position and verify that the moving component contacts the stop plate squarely. If there is a gap of more than 1 mm, add shims behind the stop plate. Never use washers as shims; use proper shim stock.
Re‑check torque after 100 operating hours, as initial settling may occur. If the stop plate becomes loose, inspect the mounting bolts and the plate itself for deformation. The hardened 380300733 should not compress; any loosening indicates bolt stretch or thread damage.
Aftermarket stop plates are often made from low‑grade mild steel that is not heat‑treated. These soft plates can deform under repeated impact, changing the travel limit and allowing over‑travel. The genuine XCMG stop plate is through‑hardened to HRC 28‑32, providing long‑term dimensional stability under high impact loads.
Counterfeit stop plates may have incorrect thickness or hole spacing, leading to improper positioning and reduced travel. The 380300733 matches the original dimensions exactly. Additionally, aftermarket plates often lack proper corrosion protection, leading to rust jacking that changes the stop position. XCMG’s zinc plating meets OEM standards for salt spray resistance.
XCMG provides a 12‑month warranty against manufacturing defects. Each stop plate is stamped with the XCMG logo and part number. This supersedes older numbers 380300701 and 380300712, with improved impact resistance and corrosion protection.
Common indicators that a stop plate needs replacement: visible cracking, deformation (cupping or bending), severe rust pitting, or wear grooves from repeated impact. Also, if the moving component contacts the stop plate with a clanking sound or if there is excessive gap between the stop plate and the component at full travel, the plate may have worn or the mounting holes may have elongated.
Preventive replacement every 6,000 operating hours is recommended for stop plates in high‑cycle applications (blade circle rotation, ripper lift). The cost of a genuine stop plate is minimal compared to the cost of a cracked casting or bent cylinder rod caused by over‑travel.
When performing major overhauls, always replace all stop plates that show any sign of wear. Keep a stock of 380300733 plates in your parts inventory for rapid field replacement.
The 380300733 Stop Plate is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent repairs.
Bulk orders (10+ pieces) receive volume discounts and can be shipped via sea freight. Each stop plate is individually wrapped in anti‑corrosion paper and boxed. For large fleets, consignment stock programs are available to ensure immediate availability.
Don’t let a worn or missing stop plate cause hydraulic over‑travel and structural damage. Order the genuine XCMG 380300733 Stop Plate today and ensure every moving component stops precisely at its factory limit.
The 380300733 Stop Plate is a testament to XCMG’s commitment to safety and durability in heavy equipment design. While often overlooked, it is a critical component that prevents catastrophic over‑travel failures. Keep spare stop plates in your service truck for field repairs, and always replace with genuine XCMG parts.
Upgrade your motor grader’s reliability with the XCMG genuine stop plate. Engineered for impact resistance, precision, and longevity – order now and experience the quality that keeps your grader productive and safe.
