The genuine XCMG 860517077 Special‑Shaped Sealing Ring is a precision‑moulded elastomeric seal designed for XCMG GR series motor graders. This OEM seal is used in hydraulic valve blocks, transmission port connections, brake line interfaces, and fuel system joints where standard O‑rings cannot provide the required geometry. Manufactured from high‑grade nitrile rubber (NBR) or fluoroelastomer (FKM) depending on the application, the 860517077 sealing ring offers exceptional resistance to oils, fuels, coolants, and temperature extremes from -40°C to +150°C. The custom profile ensures a perfect fit in non‑circular grooves, eliminating leakage paths that conventional seals would leave.
The 860517077 special‑shaped sealing ring features a complex cross‑section (rectangular, trapezoidal, or X‑ring profile) that provides superior sealing under both static and dynamic conditions. It is moulded with flash‑free parting lines and has a smooth, blemish‑free surface to ensure proper seating against mating flanges. The material hardness is optimized for compression set resistance, typically 70–80 Shore A. This ring directly replaces original special seals in GR135, GR165, GR180, GR215, GR260, GR300, GR350, and GR2003 graders.
A hardened, cracked, or extruded special‑shaped seal will cause fluid seepage, pressure drop, and contamination ingress. Replacing a failed seal with genuine XCMG 860517077 restores original sealing integrity and prevents costly fluid loss. Keep this seal in your parts inventory for rapid repair of hydraulic manifolds, transmission ports, or brake valves.
| Parameter | Specification |
|---|---|
| OEM Number | 860517077 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Static / Dynamic Seal – Custom Profile |
| Cross‑Section Shape | Rectangular / Trapezoidal / X‑ring (application specific) |
| Nominal Dimensions (ID × CS) | 52.00 mm × 3.50 mm (±0.10 mm) |
| Material (Standard) | Nitrile rubber (NBR) – 75 Shore A |
| Optional Material (High Temp) | Fluoroelastomer (FKM/Viton) – 75 Shore A |
| Hardness (NBR) | 75 ±5 Shore A (ISO 868) |
| Tensile Strength | ≥12 MPa |
| Elongation at Break | ≥250% |
| Max Working Pressure (static) | 30 MPa (300 bar / 4,350 psi) |
| Temperature Range (NBR) | -40°C to +120°C (-40°F to +248°F) |
| Temperature Range (FKM) | -20°C to +200°C (-4°F to +392°F) |
| Fluid Compatibility | Mineral oil, ATF, diesel, coolant, water‑glycol |
| Compression Set (70h @ 125°C) | ≤25% (ISO 815) |
| Groove Dimensions (recommended) | As per XCMG drawing – custom profile |
| Standards Compliance | ISO 3601‑2, DIN 3771, XCMG Q/XCMG 1094-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 860517000, 860517055, 860517075, 860517076 |
The 860517077 special‑shaped sealing ring is installed in non‑circular grooves on XCMG motor graders.
Typical locations include the hydraulic pump mounting flange, transmission valve body cavities, and brake master cylinder ports.
The custom profile provides a sealing force that standard O‑rings cannot achieve, especially in corners or irregular mating surfaces.
A failed seal allows fluid to leak past, reducing system pressure and allowing dirt to enter.
Replacing a damaged seal with genuine XCMG 860517077 restores original sealing characteristics and prevents environmental contamination.
The special shape also prevents extrusion under high pressure, making it suitable for high‑impulse circuits.
XCMG moulds the 860517077 seal in precision‑ground steel cavities to reproduce the complex profile exactly without flash.
The NBR compound is mixed with anti‑oxidants and anti‑ozonants to resist ageing and cracking.
After moulding, the seal is post‑cured in an oven to fully cross‑link the polymer, optimising compression set resistance.
Each seal is 100% visually inspected and randomly sampled for hardness, tensile strength, and dimensional accuracy.
For high‑temperature applications (engine compartments), an FKM version is available with 200°C rating.
Clean the groove and mating surface with a non‑petroleum solvent and lint‑free cloth before installing the new seal.
Inspect the groove for nicks or burrs; deburr with fine emery paper if necessary.
Lightly lubricate the seal with clean hydraulic oil or assembly paste to prevent twisting during assembly.
Press the seal into the groove, ensuring it is not stretched or twisted. The seal should sit flush or slightly below the flange surface.
Assemble the mating flange using a cross torque pattern. Tighten bolts to the torque in the service manual (typically 45–55 Nm for M10 bolts).
After assembly, run the machine at idle and inspect for leaks. Re‑torque bolts if seepage is observed.
Keep spare 860517077 seals in your service kit for emergency field repairs.
Aftermarket special‑shaped seals are often made from recycled rubber with poor compression set, causing leaks after a few heat cycles.
Many have inaccurate profiles due to worn moulds, leading to incorrect seating and immediate leakage.
Counterfeit seals may not be post‑cured, resulting in high permanent deformation when compressed.
Genuine XCMG seals are manufactured to the exact original drawing and tested for fluid compatibility.
XCMG provides a 12‑month warranty against manufacturing defects. Using OEM seals prevents repeated repairs and fluid loss.
Visible fluid weeping around the flange joint, oil drips from the component, and a noticeable drop in oil level between service intervals.
If the seal feels hardened, cracked, or has taken a permanent set (flat cross‑section), it must be replaced.
Preventive replacement is recommended every 3,000 operating hours or during any major overhaul of the component.
The cost of a genuine seal is minimal compared to the labour of re‑opening a leaking joint.
Keep a stock of 860517077 seals in your parts warehouse to avoid delays when leaks are found.
The XCMG 860517077 Special‑Shaped Sealing Ring is stocked in regional hubs: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), and Shanghai (China).
Standard air freight delivers within 2–5 business days worldwide. Expedited courier (DHL/FedEx) provides 1–2 day shipping.
Bulk orders of 50+ seals receive volume discounts and can be shipped by sea freight.
Each seal is individually packed in a labelled, anti‑contamination bag. For large fleets, consignment stock programs are available.
Don’t tolerate hydraulic leaks – order the genuine XCMG 860517077 Special‑Shaped Sealing Ring today and restore leak‑free operation on your motor grader.
Upgrade your grader’s sealing reliability with XCMG genuine special‑shaped seals. Use the buttons above to request a quote or email our parts specialists. Keep your XCMG grader running clean – choose 860517077 OEM seal.
