The 803749001 31‑Pin Connector Mounting Bracket is a genuine OEM structural component manufactured by XCMG for motor graders and heavy construction machinery. This bracket securely holds the 31‑pin electrical connector that interfaces the cab wiring harness with the chassis harness.
Designed to withstand extreme vibration, corrosion, and impact, the 803749001 bracket is fabricated from heavy‑gauge galvanized steel with a durable black powder‑coat finish. It directly replaces damaged or missing brackets on XCMG GR series graders and compatible equipment.
Each bracket is precision‑stamped and features pre‑drilled mounting holes that align exactly with factory bosses on the firewall or frame. The integrated strain relief prevents connector movement and wire fatigue, ensuring reliable electrical connections over thousands of operating hours.
| Parameter | Specification |
|---|---|
| OEM Number | 803749001 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | 31-Pin Connector Mounting Bracket |
| Material | Galvanized steel (DX54D+Z), 2.5 mm thickness |
| Finish | Black powder coating (epoxy-polyester, 80-100 µm) |
| Compatible Connector | 31-pin AMP/TE Connectivity HDSCS series |
| Mounting Hole Pattern | 4 holes, M8 x 1.25, 85 mm x 62 mm spacing |
| Overall Dimensions | 120 mm (L) x 90 mm (W) x 25 mm (H) |
| Bracket Thickness | 2.5 mm (0.098 in) |
| Corrosion Protection | 500+ hours salt spray (ASTM B117) |
| Temperature Range | -40°C to +120°C |
| Load Capacity | Withstands 50 N pull force on connector |
| Vibration Resistance | 20g (10-500Hz) per ISO 16750-3 |
| Mounting Hardware | 4x M8 bolts (not included, order separately) |
| Strain Relief Type | Integrated clamp with rubber cushion |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 803748812, 803748955, 803748920 |
The XCMG 803749001 Mounting Bracket provides a rigid, vibration‑damped mounting point for the main 31‑pin cab‑to‑chassis connector. This connector carries power, CAN bus signals, lighting, and control circuits. Without a secure bracket, the connector can loosen over time, causing intermittent faults or complete electrical failure.
XCMG engineers designed this bracket to absorb shocks and isolate the connector from frame flex. The powder‑coated finish resists rust from road salt, mud, and pressure washing. The integrated rubber grommet prevents wire chafing at the entry point, a common failure area on older machines.
When the original bracket cracks or corrodes, replacing it with the 803749001 restores proper alignment. Misaligned connectors often result in bent pins, water ingress, or poor contact resistance. This genuine bracket ensures the 31‑pin connector mates squarely and seals correctly against moisture and dust.
The 803749001 bracket is manufactured using progressive stamping dies followed by robotic welding of reinforcement gussets. The galvanized steel base material provides sacrificial corrosion protection even if the powder coating is scratched. All edges are deburred to prevent wire insulation damage.
XCMG tests each production batch for dimensional accuracy using CMM (coordinate measuring machines). The four mounting holes have a positional tolerance of ±0.2 mm, guaranteeing bolt alignment with existing threaded bosses on the motor grader firewall or side panel.
The bracket also features two alignment dowels (integrated) that engage with corresponding holes on the connector housing, preventing rotational movement. This is critical for maintaining proper pin alignment in high‑vibration applications.
Replacing a damaged 31‑pin connector bracket is straightforward. First, disconnect the battery negative cable. Remove the 31‑pin connector by releasing the locking lever and unplugging it from the mating half. Use a 13 mm socket to remove the four M8 bolts securing the old bracket.
Clean the mounting surface on the firewall or frame, removing any rust or paint flakes. Position the new 803749001 bracket and loosely install the four bolts. Torque to 25 Nm in a cross pattern. Ensure the bracket is not warped – it should sit flat against the mounting surface.
Reattach the 31‑pin connector, ensuring the locking lever clicks audibly. Verify that the connector seal is compressed evenly. Apply dielectric grease to the connector terminals if desired. Reconnect the battery and test all affected electrical functions (lights, display, transmission controls).
Aftermarket brackets often use thinner steel (1.5 mm vs 2.5 mm) and lack the reinforcement ribs, leading to flexing and fatigue cracks. The genuine 803749001 is rated for 10,000+ hours of vibration without failure. Cheap brackets also skip the powder coating, rusting within months.
Counterfeit brackets may have incorrect hole spacing, requiring drilling or modification of the grader frame – a dangerous practice that can weaken the structure. The XCMG bracket is a direct fit, saving labor and ensuring safety.
XCMG provides a 12‑month warranty against defects. Each bracket is stamped with the XCMG logo and part number for traceability. This bracket supersedes older versions 803748812 and 803748955, with improved corrosion resistance and strain relief.
Common symptoms of a failing 31‑pin connector bracket include: intermittent warning lights, flickering dashboard, transmission shifting faults, or complete loss of cab power. Inspect the bracket for cracks, rust perforation, or loose bolts during routine maintenance.
If you notice the connector is loose or can be wiggled by hand, the bracket has likely failed. Also check for corrosion around the connector pins – a misaligned bracket allows moisture ingress. Replace immediately with the 803749001 to avoid expensive wiring harness damage.
Preventive replacement every 8,000 hours is recommended for graders in extreme applications (mining, snow removal). The bracket is a low‑cost component that protects the expensive 31‑pin harness and reduces downtime.
The 803749001 Mounting Bracket is stocked in XCMG 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 discounted pricing and can be shipped via sea freight. Each bracket is individually wrapped in anti‑corrosion paper and boxed. For large fleets, consignment stock programs are available to ensure immediate availability.
Don’t risk your grader’s electrical reliability with makeshift repairs. Order the genuine XCMG 803749001 31‑Pin Connector Mounting Bracket today and secure your machine’s vital connections.
The 803749001 bracket is designed for all XCMG GR series motor graders from 2010 onward. It also fits certain XCMG XS series rollers and LW series loaders that use the same 31‑pin cab harness interface. Always verify your existing bracket dimensions, but the 803749001 is the direct replacement for most models.
If your machine has a 24‑pin or 18‑pin connector, this bracket may not fit. However, the 803749001 is specifically for the 31‑pin AMP/TE Connectivity HDSCS connector. Check your connector type before ordering. The bracket also includes mounting provisions for additional zip ties to secure loose wires.
For older graders (pre‑2010), minor drilling may be required, but the 803749001 can be adapted using universal mounting slots. Consult your XCMG dealer for retrofit advice. Genuine brackets guarantee safety and performance.
The 803749001 31‑Pin Connector Mounting Bracket is an essential component for maintaining your XCMG motor grader’s electrical integrity. A secure bracket prevents costly harness repairs and unexpected downtime. Invest in genuine XCMG quality.
Upgrade or replace your damaged bracket today. The 803749001 is precision‑engineered to outlast the machine itself. Order now and experience the reliability of OEM XCMG parts – designed by the people who built your grader.
For fleet maintenance programs, keep several 803749001 brackets in stock. They are a common failure point on high‑hour machines, and having a spare ensures rapid repair. Protect your investment with genuine XCMG components.
