The 800370391 Outer Friction Plate is a genuine XCMG transmission and steering clutch component engineered for motor grader drivetrains. This high‑performance friction disc, also known as a clutch plate or friction ring, provides reliable torque transmission and smooth gear engagement in XCMG GR series graders. Manufactured from premium steel with a bonded paper‑based friction lining, the 800370391 outer friction plate delivers consistent coefficient of friction, excellent heat dissipation, and long service life under heavy grading and ripping loads.
The 800370391 outer friction plate is designed to work in oil‑immersed multi‑disc clutches, commonly found in powershift transmissions and steering clutch packs. It directly replaces worn, glazed, or burnt plates in XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. A worn friction plate leads to clutch slippage, overheating, delayed engagement, and loss of drive power.
Proper friction material integrity is critical for motor grader maneuverability and grade control. The 800370391 outer friction plate features precision‑engineered oil grooves for cooling and anti‑stick properties, ensuring consistent apply and release. Replacing a failed plate with the genuine XCMG 800370391 restores original clutch performance, prevents steel‑on‑steel contact, and protects the pressure plates and pistons.
| Parameter | Specification |
|---|---|
| OEM Number | 800370391 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Outer Friction Plate / Clutch Disc (Wet type) |
| Friction Material | Paper‑based phenolic resin with high‑energy friction modifiers |
| Core Material | Stamped steel (DC04 / SAE 1008), zinc‑phosphate coated |
| Outer Diameter | 230 mm (±0.2 mm) |
| Inner Diameter | 165 mm (±0.2 mm) |
| Thickness (New) | 3.5 mm (±0.07 mm) |
| Number of Spline Teeth | 28 (internal involute spline) |
| Friction Surface Grooves | Radial spiral oil grooves (8 channels) |
| Coefficient of Friction (wet) | 0.12 – 0.14 (SAE #2 test, oil immersed) |
| Max. Operating Pressure | 14 bar (1.4 MPa) for clutch apply |
| Max. Continuous Torque Capacity | 1050 N·m per plate |
| Temperature Range | -40°C to +150°C (continuous oil sump temperature) |
| Recommended Transmission Fluid | XCMG SAE 10W / 30W (Allison C-4 / TO-4 ) |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 800370301, 800370345, 800370378, 800370385 |
The XCMG 800370391 outer friction plate is a vital component in the grader’s powershift transmission and steering clutch packs. It engages with steel separator plates to transmit engine torque to the wheels or to lock/unlock the steering brakes. Without properly functioning friction plates, gear shifts become harsh or delayed, and steering response suffers.
In a typical 6‑speed powershift transmission, multiple 800370391 plates are stacked alternately with steel plates. When hydraulic pressure applies the clutch piston, these plates are compressed, and friction generates the driving force. The paper‑faced material ensures a smooth, progressive engagement even under high load.
A worn 800370391 outer friction plate loses its friction coefficient and may also break apart, contaminating the transmission oil. This leads to slipping under torque, overheating, and eventual clutch failure. Replacing worn plates with genuine XCMG 800370391 restores shift quality and prevents damage to the clutch hub and piston seals.
Each 800370391 outer friction plate uses a paper‑based friction paper bonded to a stamped steel core. The paper is composed of high‑temperature resistant fibers, phenolic resin, and friction modifiers, providing stable friction even at elevated oil temperatures. The bonding process uses heat and pressure to ensure no delamination under repeated clutch cycling.
The steel core is precisely stamped and deburred, then zinc‑phosphate coated to prevent rust and improve adhesion of the friction paper. Oil grooves are molded into the friction surface to allow cooling oil to flow between plates, reducing heat generation and preventing glazing.
XCMG performs 100% visual and thickness inspection of each 800370391 plate. Random samples are tested on a clutch dynamometer to verify torque capacity, static friction, and durability over 250,000 engagement cycles. This quality control ensures that every plate meets original equipment performance standards.
Replacing the 800370391 outer friction plates requires removing the transmission or steering clutch pack assembly. Drain the oil and clean all components thoroughly. Inspect the steel separator plates for scoring or warping – replace if damaged. The clutch hub splines must be free of burrs.
Before installation, soak new friction plates in clean transmission oil for at least 30 minutes to saturate the friction material. Insert each 800370391 plate into the clutch drum, alternating with steel plates as per the service manual (typically 6 friction / 5 steel plates per clutch pack).
After reassembly, check clutch pack clearance using a feeler gauge or by measuring piston stroke. Adjust with selective snap rings if necessary. Fill with approved transmission fluid, then perform a stall test to confirm clutch hold pressure. Always replace all friction plates in a given clutch pack – never mix old and new plates.
Typical signs that the 800370391 outer friction plates need replacement: transmission slipping during acceleration or uphill, delayed engagement when shifting from neutral to drive, elevated transmission oil temperature, dark or burnt‑smelling oil, and shuddering during clutch apply.
If the friction paper separates from the steel core, debris can clog the hydraulic control valves, causing erratic shifting. Metal‑to‑metal contact will damage the steel plates and clutch housing. Replacing all 800370391 plates with genuine XCMG parts restores proper clutch function and extends transmission life.
Aftermarket friction plates often use lower‑quality paper that glazes quickly or disintegrates in hot oil. They may have incorrect thickness, causing improper clutch pack clearance and either slipping or preload. Some counterfeit plates lack proper oil grooves, leading to overheating and rapid failure.
Genuine XCMG 800370391 plates are manufactured to exact OE dimensions and friction characteristics. They are batch‑tested for coefficient of friction, shear strength, and thermal durability. Each plate carries the XCMG logo and part number for traceability.
XCMG provides a 12‑month warranty against manufacturing defects. Using genuine XCMG friction plates ensures consistent shift feel, prevents premature wear of steel plates, and protects your grader’s transmission from costly failures. Don’t compromise on clutch components – always choose genuine.
Inspect the 800370391 outer friction plates at every transmission oil change (every 1,500 operating hours). If oil is dark or has a burnt odor, send a sample for analysis. Early signs of friction wear include elevated iron content and viscosity loss.
Proactively replace friction plates when transmission is disassembled for other repairs (e.g., seal replacement or bearing failure). The cost of a full set of 800370391 plates is far lower than a rebuilt transmission caused by catastrophic clutch failure.
Always use the manufacturer‑recommended transmission fluid (XCMG专用油 or equivalent TO‑4 specification). Avoid mixing different oil brands or using universal tractor fluids that lack the proper friction modifiers. Proper fluid and regular changes maximize the life of the 800370391 friction plates.
The 800370391 Outer Friction Plate is stocked in XCMG regional warehouses: Houston (North America), Rotterdam (Europe), Dubai (Middle East), and Shanghai (Asia). Standard air freight delivers within 3‑7 business days; expedited shipping (1‑2 days) is available for urgent transmission overhauls.
Each plate is individually packed in sealed anti‑static bags to preserve the friction material. Bulk orders (10+ plates) receive volume discounts and can be shipped via sea freight. For large fleets, consignment stock programs ensure immediate availability and reduce downtime.
Order the genuine XCMG 800370391 Outer Friction Plate today and restore smooth shifting and reliable steering in your motor grader. Whether you are rebuilding a slipping clutch or performing preventive maintenance, the 800370391 guarantees correct fit, proper friction characteristics, and long service life. Don’t let worn plates cause transmission overheating or loss of drive power.
Upgrade your grader’s drivetrain reliability with XCMG genuine clutch components. The 800370391 outer friction plate reflects precision engineering and high‑quality materials. Trust XCMG original parts to keep your GR series motor graders productive, efficient, and safe on every job site.
