The 380800259 Mounting Plate is a genuine OEM structural component manufactured by XCMG for motor graders and heavy construction equipment. This precision‑fabricated steel plate serves as a rigid interface for attaching critical assemblies such as the circle drive support, drawbar mounting bracket, and blade lift cylinder base on XCMG GR series motor graders. Manufactured from high‑strength low‑alloy steel with CNC‑machined mounting holes and corrosion‑resistant paint, the 380800259 mounting plate is designed to withstand extreme torsional loads, vibration, and impact forces in demanding grading environments.
The mounting plate 380800259 is a direct replacement for cracked, bent, or worn base plates on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Typical applications include the interface between the circle support and the main frame, the attachment point for the lift cylinder lower pin, and the reinforcement plate for the articulation housing. The plate features multiple precision‑drilled bolt holes, dowel pin locations, and stress‑relieving fillets that exactly match original factory specifications.
A damaged mounting plate leads to misalignment of attached components, excessive play in the circle drive, accelerated pin and bushing wear, and eventual structural cracking of adjacent frames. Replacing a faulty plate with the genuine XCMG 380800259 restores proper geometry, eliminates looseness, and extends the service life of your grader’s most critical systems.
| Parameter | Specification |
|---|---|
| OEM Number | 380800259 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Mounting Plate / Base Plate (Structural Mount) |
| Material | High‑strength low‑alloy steel (HSLA) – Q460C or equivalent |
| Plate Thickness | 25 mm (machined) |
| Overall Dimensions (approx.) | 400 mm × 250 mm × 25 mm |
| Number of Bolt Holes | 6 holes (M24 clearance) + 2 dowel pin holes (20 mm) |
| Dowel Pin Hole Tolerance | H7 (20.000 – 20.021 mm) |
| Yield Strength | ≥ 460 MPa (67,000 psi) |
| Tensile Strength | ≥ 550 MPa (80,000 psi) |
| Surface Finish | Epoxy primer + polyurethane top coat (RAL 1007) |
| Flatness Tolerance | 0.2 mm over entire surface |
| Operating Temperature Range | -40°C to +80°C |
| Standards | ISO 9001:2024, EN 1090-2 (EXC3) |
| Compatible Models | XCMG GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350 |
| Superseded Part Numbers | 380800240, 380800245, 380800250 |
The XCMG 380800259 Mounting Plate serves as the foundation for several key assemblies on GR series graders. It is most commonly used as the interface plate between the circle drive support and the main frame, distributing the high loads from blade rotation evenly across the chassis. Without a flat, rigid mounting plate, the circle support can twist under load, causing the entire moldboard to tilt unexpectedly.
In addition, this mounting plate acts as the base for the blade lift cylinder lower pin bracket. A warped or cracked plate changes the cylinder’s alignment, resulting in side loading of the piston rod, premature seal wear, and eventual cylinder failure. The genuine 380800259 plate is machined flat to within 0.2 mm, guaranteeing perfect cylinder alignment.
The plate also reinforces the articulation joint housing, preventing the two frame halves from shifting under heavy side loads. A damaged mounting plate often goes unnoticed until the grader exhibits poor steering or unusual vibrations. Replacing it with the OEM 380800259 restores the original stiffness and eliminates hidden movement.
Each 380800259 mounting plate is laser‑cut from certified HSLA steel plate, then heat‑treated to relieve residual stresses. The plate is then surface‑ground on a large‑format grinder to achieve the specified flatness. The bolt holes and dowel pin holes are milled on a CNC machining center with tool offsets verified every 50 pieces.
All holes are inspected using an optical comparator or coordinate measuring machine (CMM). The dowel hole positions are held to a true position tolerance of ±0.05 mm, ensuring exact alignment with the mating dowels on the frame and circle support. After machining, each plate is shot‑blasted to SA 2.5 finish, then coated with epoxy primer and a polyurethane top coat.
XCMG’s quality control includes 100% visual inspection for surface defects, plus random sampling for flatness and thickness. The coating is tested for adhesion (crosshatch) and thickness (120‑150 µm). Every plate carries a laser‑etched XCMG logo, part number, and batch code for full traceability.
To replace the mounting plate 380800259, first support the circle drive or implement using an overhead crane. Remove the six M24 bolts and the two dowel pins. Clean the frame mounting face thoroughly with a scraper and degreaser. Check the frame face for flatness (max 0.3 mm deviation).
Position the new plate onto the dowel pins; they will locate it exactly. Install new M24 bolts (grade 10.9) with molybdenum disulfide lubricant. Torque to 550 Nm in a cross pattern, then check that all bolts are seated. Use new lock nuts (nyloc or equivalent). Never reuse old bolts as they may have yield‑stretched.
After installation, bolt the circle support or bracket onto the plate using the same torque specification. Cycle the circle or operate the blade lift through a full stroke and check for any binding. If movement is not smooth, re‑check the plate flatness and frame alignment.
Aftermarket mounting plates are often fabricated from mild steel that bends under load, or they have inaccurate hole positions that force misalignment. The genuine XCMG plate uses certified HSLA steel with a yield strength 40% higher than common structural steel. The holes are machined to exact positions, guaranteeing a bolt‑up fit without wallowing.
Counterfeit plates frequently have poor weld repairs or lack stress‑relieving heat treatment, leading to cracking after only a few hundred hours. The 380800259 is fully stress‑relieved and magnetic particle inspected for hidden cracks. In addition, the genuine plate has the XCMG logo and part number embossed into the metal.
XCMG provides a 12‑month warranty against manufacturing defects. Using genuine parts protects your grader’s structural integrity and prevents costly frame damage. Choose the 380800259 genuine mounting plate for long‑term reliability and safety.
Common indicators that the mounting plate needs replacement: visible distortion (bowing) when a straightedge is laid across the face, cracks radiating from bolt holes, rust bleeding from under the paint indicating deep corrosion, and loosening of bolts even after retorquing. Also, if dowel pins can be removed by hand (they should be an interference fit), the plate holes are worn.
Preventive replacement is recommended every 8,000 operating hours or whenever the circle drive or blade lift assembly is overhauled. The cost of the plate is minor compared to the cost of repairing a twisted frame or replacing a cracked circle support. During routine maintenance, check the plate for flatness with a straightedge and feeler gauge (max gap 0.3 mm).
Keep a spare 380800259 mounting plate in your parts inventory for emergency replacement. A broken plate can cause sudden loss of circle control, leading to serious safety hazards. Replace immediately if any cracks appear.
The 380800259 Mounting 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 critical breakdowns. Bulk orders (5+ plates) receive volume discounts and can be shipped via sea freight.
Each plate is packaged in a heavy‑duty wooden crate with protective foam padding. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime. Don’t let a damaged mounting plate compromise your grader’s alignment or safety.
Order the genuine XCMG 380800259 Mounting Plate today and restore structural rigidity to your motor grader’s circle drive and blade lift systems. This plate is a foundation component for accurate blade control and machine longevity. Keep a spare in your service inventory and always replace with genuine XCMG parts.
Upgrade your motor grader’s reliability with the XCMG genuine mounting plate. Engineered for strength, flatness, and fatigue resistance – order now and experience the quality that keeps your grader productive and safe.
