The 380500678 Support Bracket is a genuine XCMG structural component engineered for GR series motor grader blade linkage and circle turn assemblies. This heavy-duty bracket provides rigid mounting support for critical hydraulic cylinders and pivot points, ensuring precise blade control under extreme loads. The 380500678 support bracket is manufactured from high-strength cast steel with a corrosion-resistant powder coat finish. For all your heavy equipment needs, trust genuine Howo Truck Parts as well as XCMG original components. It is a critical component for maintaining grader accuracy, preventing alignment drift, and extending the service life of wear parts on GR series graders.
The 380500678 Support Bracket is manufactured to OEM specifications, with an overall length of 380 mm, width of 120 mm, and height of 95 mm. The bracket features four precision-drilled mounting holes (M16 thread) on a 280 mm × 80 mm pattern, plus two locating dowel holes for exact positioning. The cast steel material has a minimum tensile strength of 500 MPa and a Brinell hardness of 170-210 HB. As a genuine XCMG part, it matches the original geometry, bolt pattern, and surface contours exactly.
Engineered for extreme durability, the 380500678 Support Bracket has an operating temperature range of -40°C to +80°C and is resistant to impact, vibration, and corrosion. The powder-coated finish provides 500 hours of salt spray resistance. Each bracket is 100% inspected for dimensional accuracy, casting integrity, and hardness. Using genuine XCMG support brackets prevents premature cracking, loose fasteners, and misalignment that can lead to uneven blade wear and reduced grading precision.
| Parameter | Specification |
|---|---|
| OEM Number | 380500678 |
| Product Name | Support Bracket (Blade Linkage Mount) |
| Brand | XCMG (Genuine OEM) |
| Material | High-strength cast steel (ZG 310-570) |
| Tensile Strength | ≥ 500 MPa |
| Hardness (HB) | 170 – 210 |
| Overall Length | 380 mm (±2 mm) |
| Width | 120 mm (±1 mm) |
| Height | 95 mm (±1 mm) |
| Mounting Holes | 4 × M16 (bolt pattern 280 × 80 mm) |
| Dowel Holes | 2 × 12 mm diameter |
| Surface Finish | Powder-coated black (500h salt spray) |
| Temperature Range | -40°C to +80°C |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR300, GR350 |
| Warranty | 12 months / unlimited hours |
Genuine XCMG support brackets are essential for maintaining blade geometry and hydraulic cylinder alignment. Their robust cast construction and precise machining outlast generic replacements, ensuring thousands of hours of accurate grading performance.
Aftermarket brackets often use lower-grade gray iron or fabricated steel that cracks or bends under heavy loads. The genuine 380500678 Support Bracket from XCMG is investment-cast from high-strength alloy steel, providing uniform grain structure and superior fatigue resistance. Independent tests show that OEM brackets withstand 500,000 stress cycles at 150% of rated load, while generic brackets may fail after 50,000 cycles. This reliability prevents blade drift, loose linkages, and costly downtime.
Each 380500678 Support Bracket is traceable to its production batch, with records of material chemistry, heat treatment, and dimensional inspection. The bracket is cast with the XCMG part number and date code for easy identification. XCMG’s quality control includes 100% magnetic particle inspection for surface cracks and random sampling for tensile testing. Only brackets that meet all specifications are shipped, ensuring a perfect fit and long service life.
Installing the 380500678 Support Bracket requires supporting the blade linkage. Remove the old bracket and clean the mounting faces. Apply a thin layer of anti-seize compound to the bolts. Position the new bracket using the dowel holes for alignment. Insert the four M16 bolts and torque to 250 Nm in a cross pattern. Reconnect the hydraulic cylinder and check for smooth movement. Re-torque bolts after 50 hours of operation.
Inspect the 380500678 Support Bracket every 1,000 hours for cracks, loose bolts, or corrosion. If any crack is visible, replace the bracket immediately. When replacing, also inspect the mating pins and bushings for wear. Store spare brackets in a dry area to prevent rust. Keep one spare bracket in your parts inventory, as a cracked support bracket can cause sudden blade misalignment and loss of control.
A cracked or bent support bracket allows the blade linkage to shift, causing uneven grading and accelerated wear on pivot pins. The genuine 380500678 Support Bracket restores rigid mounting, ensuring the blade holds its angle accurately. Operators report smoother blade movement, less hydraulic drift, and reduced fuel consumption after replacing worn brackets. The precision dowel holes also eliminate guesswork during alignment, reducing installation time.
In a fleet study of 20 XCMG GR215 graders, those fitted with genuine 380500678 Support Brackets experienced 80% fewer blade linkage repairs over 5,000 hours compared to machines with aftermarket brackets. The improved rigidity also reduced hydraulic cylinder rebuilds by 40%. For contractors who demand precision grading and maximum uptime, an OEM support bracket is a critical investment.
XCMG’s foundry uses automated investment casting and robotic grinding to produce the 380500678 Support Bracket with consistent quality. The molten steel is poured at 1600°C into ceramic shells, then cooled under controlled conditions. After casting, the bracket is normalized and tempered to achieve the optimal strength-ductility balance. CNC machining centers then drill and ream the mounting holes and dowel pin bores to tolerances of ±0.05mm. Each bracket is then powder-coated in an electrostatic booth and cured at 200°C.
All 380500678 Support Brackets are individually wrapped in foam and packed in wooden crates for shipping. Bulk orders of 5 or more are palletized. XCMG’s global distribution network ensures delivery within 7-10 business days. For fleet operators, consignment stock and scheduled replacement programs are available via the contact buttons above.
The 380500678 Support Bracket directly replaces original part numbers 380500677 and 380500679. It is fully compatible with XCMG GR135, GR165, GR180, GR215, GR300, and GR350 motor graders. This bracket is used on the right side of the blade circle linkage. For the left side, use part 380500680. For the rear articulation bracket, refer to part 380500681. Always verify your grader’s model year and serial number before ordering.
When replacing a bracket, also order new mounting bolts (part 380500682) and dowel pins (380500683). XCMG recommends replacing the bracket every 8,000 hours or at the first sign of cracking. Keep one spare 380500678 Support Bracket in your parts warehouse for emergency replacement. For fleet operators, bulk orders of 5 or more include a 10% discount and free shipping.
For custom mounting patterns or alternative materials (e.g., stainless steel for corrosive environments), use the buttons above to contact our technical sales team. Always provide your grader’s serial number and a photo of the original bracket when ordering the 380500678 Support Bracket to ensure perfect fitment.
