The 860517072 Pressure Plate is a genuine XCMG clutch component engineered for motor grader powershift transmissions and steering clutch packs. This precision‑machined steel plate, also known as a clutch pressure plate or reaction plate, provides the rigid backing surface against which friction plates are compressed to transmit torque. Manufactured from high‑carbon alloy steel with a precision‑ground face and heat‑treated wear surface, the 860517072 pressure plate ensures consistent clutch apply force, even load distribution, and long service life under extreme grading conditions.
The 860517072 pressure plate is a direct replacement for worn, scored, or warped plates in XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Typical applications include the forward/reverse clutch pack, speed clutch packs, and steering brake clutch assemblies. The plate features a superfinished working face with cross‑hatched oil retention grooves, ensuring proper lubrication and preventing friction plate glazing.
A damaged or warped pressure plate causes uneven clutch engagement, shuddering, clutch slip, and accelerated friction plate wear. Replacing a faulty plate with the genuine XCMG 860517072 restores correct clutch stack height, ensures uniform apply pressure, and protects the transmission from catastrophic failure.
| Parameter | Specification |
|---|---|
| OEM Number | 860517072 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Pressure Plate / Clutch Reaction Plate (Wet type) |
| Outer Diameter | 230 mm (±0.2 mm) |
| Inner Diameter | 165 mm (±0.2 mm) |
| Thickness | 6.0 mm (±0.05 mm) |
| Material | High‑carbon alloy steel 50CrMo4 (DIN 1.7225) |
| Hardness | 48–54 HRC (through‑hardened) |
| Surface Flatness | ≤ 0.05 mm (total indicator reading) |
| Surface Finish (Ra) | 0.8 – 1.2 µm (ground and polished) |
| Oil Grooves | Radial / spiral pattern on both faces (6 channels) |
| Max. Apply Pressure | 14 bar (1.4 MPa) hydraulic piston force |
| Max. Transmissible Torque (per clutch pack) | 1100 N·m (with mating friction plates) |
| Operating Temperature Range | -40°C to +150°C (-40°F to +302°F) |
| Surface Treatment | Zinc phosphate + anti‑rust oil |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 860517001, 860517045, 860517065, 860517068 |
The XCMG 860517072 pressure plate is the rigid backing component in a wet clutch pack. It is positioned at one end of the clutch drum and provides a flat, hardened surface against which the piston compresses the alternating friction and steel plates.
When hydraulic pressure is applied, the piston forces the friction plates against the pressure plate, generating clamping force and transmitting torque. The pressure plate must remain perfectly flat to ensure even pressure distribution across all plates.
If the 860517072 pressure plate becomes warped or scored, clutch engagement becomes uneven, causing chatter, reduced torque capacity, and rapid overheating. Replacing a damaged plate restores smooth, progressive clutch apply and prevents damage to the piston seals and clutch hub.
Each 860517072 pressure plate is produced from 50CrMo4 chromium‑molybdenum alloy steel, known for its excellent hardenability and resistance to thermal distortion. The forging process ensures a uniform grain structure, eliminating internal voids that could lead to cracking under cyclic loading.
After rough forming, the plate is through‑hardened via oil quenching and tempering to achieve a hardness of 48–54 HRC. This balances wear resistance with toughness, preventing surface spalling while maintaining the ability to absorb shock loads.
The working faces are double‑disc ground and then lapped to achieve a flatness of 0.05 mm TIR and a surface finish of 0.8‑1.2 µm Ra. Precision‑machined oil grooves are added to promote lubricant flow and prevent friction plate adhesion. Each plate is 100% flatness‑checked using optical comparators.
Replacing the 860517072 pressure plate requires removal of the clutch pack from the transmission. Drain the oil and remove the clutch housing cover. Extract the snap ring and remove the steel and friction plates in order to access the pressure plate.
Inspect the piston sealing surface and clutch drum for damage. Clean the drum thoroughly. Install the new pressure plate into the drum, ensuring it seats correctly against the retaining ring or shoulder. The oil groove side should face the friction plates (check service manual orientation).
Reinstall the friction and steel plates in the correct sequence, then secure with the snap ring. Measure clutch pack free height or piston stroke using feeler gauges – adjust with selective plates if needed. Fill with approved transmission fluid and perform low‑speed clutch engagement tests.
Common symptoms of a worn 860517072 pressure plate include: clutch shudder during engagement, slow or incomplete clutch release, shifting delays, dark or burnt‑smelling transmission oil, and visible scoring or bluing on the plate face.
If the pressure plate is warped beyond specification, the clutch may drag when released, causing difficult gear engagement. In severe cases, the pressure plate can crack, leading to complete clutch pack disintegration. Always replace the pressure plate when rebuilding a clutch pack – never reuse a scored or glazed plate.
Aftermarket pressure plates are often made from lower‑grade carbon steel (e.g., C45) without proper heat treatment. They may warp after a few heat cycles, causing uneven wear of friction plates and clutch slip. Counterfeit plates frequently have poor surface flatness, leading to hot spots and glazing.
Genuine XCMG 860517072 plates are manufactured to exact OE specifications, including through‑hardening, precision grinding, and oil groove geometry. They are batch‑tested for hardness, flatness, and dimensional accuracy. Each plate is stamped with the XCMG logo and part number for full traceability.
XCMG provides a 12‑month warranty against manufacturing defects. Using genuine XCMG pressure plates ensures consistent clutch apply force, extends friction plate life, and protects your grader’s transmission from premature wear.
Inspect the 860517072 pressure plate during transmission overhauls (every 3,000‑4,000 hours). Remove the plate and check for scoring, heat checking (crazing), or discoloration. Place a straightedge across the face – visible light underneath indicates warpage exceeding 0.1 mm.
Measure the plate thickness at four points; if any measurement is below 5.95 mm (less than 99% of new), replace the plate. Always replace pressure plates in pairs if two are used in a dual‑clutch arrangement. Keep a spare 860517072 plate in your inventory for emergency rebuilds.
Use only the recommended transmission fluid – incorrect friction modifiers can attack the plate surface. Change the oil and filter at specified intervals to prevent abrasive contaminants from scoring the plate face. Proper care extends the service life of both the pressure plate and friction plates.
The 860517072 Pressure 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 clutch failure emergencies.
Each plate is individually packed in a foam‑lined box with VCI anti‑rust paper. Bulk orders (5+ plates) qualify for volume discounts and can be shipped via sea freight. For large fleets, consignment stock programs ensure immediate availability and reduce costly downtime.
Order the genuine XCMG 860517072 Pressure Plate today and restore proper clutch function in your motor grader. Whether you are performing a full transmission rebuild or replacing a warped plate, the 860517072 guarantees correct flatness, hardness, and oil groove geometry. Don’t let a damaged pressure plate cause clutch slip or drivetrain failure.
Upgrade your maintenance strategy with OEM‑grade XCMG clutch components. The 860517072 pressure plate reflects XCMG’s commitment to durability and precision. Trust genuine parts to keep your GR series motor graders shifting smoothly and delivering reliable performance under the toughest grading conditions.
