The genuine XCMG 860528988 Snap-On Seal Ring (30×2 mm, DIN 34110) is a precision fluid sealing component manufactured for XCMG GR series motor graders. This snap‑on or “clamp” sealing ring is used in hydraulic manifolds, valve blocks, brake circuits, and transmission port connections to provide a reliable, leak‑free seal between mating flanges and threaded plugs. Manufactured from high‑grade nitrile rubber (NBR) with a robust fabric‑reinforced outer layer, the 860528988 seal ring offers exceptional resistance to hydraulic oils, transmission fluids, and temperature extremes from -40°C to +125°C. The snap‑on design ensures positive locking into a machined groove, preventing misalignment during assembly and guaranteeing a perfect seal under pulsating pressure.
The 860528988 seal ring measures 30 mm inner diameter and 2 mm cross‑section thickness, conforming to DIN 34110 standards. It features a trapezoidal cross‑section with a locking lip that produces an audible “click” when correctly seated. This seal is widely installed on XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, and GR2003 graders in locations such as the hydraulic pump suction port, steering valve interfaces, and differential lock actuator ports.
A hardened, cracked, or extruded sealing ring will cause oil seepage, pressure drop, and contamination ingress. Replacing a failed seal with genuine XCMG 860528988 restores original sealing force and prevents costly fluid loss. Keep spare snap‑on rings in your parts inventory to ensure rapid repair of hydraulic leaks.
| Parameter | Specification |
|---|---|
| OEM Number | 860528988 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Snap-On Sealing Ring / Clamp Seal (DIN 34110) |
| Inner Diameter (ID) | 30.00 mm (±0.15 mm) |
| Cross-Section Thickness | 2.00 mm (±0.10 mm) |
| Outer Diameter (approximate) | 34.00 mm (depending on groove) |
| Cross-Section Shape | Trapezoidal with snap-lock lip |
| Material | Nitrile rubber (NBR) with fabric reinforcement (70 Shore A ±5) |
| Fabric Reinforcement | High-tenacity polyamide fabric molded into outer layer |
| Hardness | 70 ±5 Shore A (ISO 868) |
| Tensile Strength | ≥12 MPa |
| Elongation at Break | ≥250% |
| Maximum Working Pressure | 25 MPa (250 bar / 3,625 psi) static; 20 MPa dynamic |
| Temperature Range | -40°C to +125°C (-40°F to +257°F) |
| Fluid Compatibility | Mineral oil, synthetic hydraulic oil, ATF, diesel, coolant, water-glycol |
| Compression Set (70h @ 125°C) | ≤25% (ISO 815) |
| Groove Diameter (recommended) | 30.0 mm (for snap-fit) with chamfered edges |
| Standards | DIN 34110, ISO 3601-2, XCMG spec Q/XCMG 1087-2022 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 860521100, 860524455, 860527899, 860528712 |
The 860528988 snap‑on sealing ring is installed in static flange joints and threaded port connections where hydraulic oil or brake fluid passes between two components. Typical locations on XCMG graders include the hydraulic pressure filter housing, brake valve manifold, and transmission oil cooler ports. The ring’s snap lip locks into a precision groove, ensuring it stays centered during assembly and preventing extrusion.
When bolts are tightened or the threaded plug is torqued, the trapezoidal cross‑section compresses, creating a high‑pressure seal that resists blowout even at 25 MPa. The fabric reinforcement adds burst strength and prevents the ring from being forced into the gap between mating surfaces. Without a proper seal, fluid leaks develop rapidly, leading to loss of hydraulic power or contamination of the environment.
Over time, heat cycles and fluid attack cause the rubber to harden and lose elasticity. A hardened ring can no longer conform to micro‑imperfections on the mating surfaces, resulting in weeping leaks. Replacing the aged seal with genuine 860528988 restores leak‑free integrity and ensures consistent hydraulic pressure.
The 860528988 ring is compression‑molded from a specially formulated nitrile rubber compound that provides exceptional oil resistance and low compression set. The fabric reinforcement is precisely positioned during the molding process to be fully encapsulated, preventing delamination. Each batch is tested for tensile strength, elongation, and hardness to ensure compliance with XCMG specifications.
Post‑molding, the rings undergo a post‑cure oven cycle to stabilize cross‑linking and remove volatile components. The snap‑on lip is inspected using optical comparators to verify the locking geometry – any deviation beyond ±0.05 mm is rejected. The rings are then vacuum‑packed in anti‑static bags to protect them from ozone and UV degradation during storage.
XCMG’s quality system includes random sampling for accelerated aging tests (500 hours at 125°C in hydraulic oil). After aging, the rings must retain at least 80% of original tensile strength and show no cracking or surface deterioration. This ensures genuine 860528988 rings provide reliable service for years in the harshest grading conditions.
Before installing a new 860528988 sealing ring, thoroughly clean the groove in the flange face or port using a soft brass brush and non‑petroleum solvent. Remove any old sealant, hardened rubber residues, or corrosion. Inspect the groove for nicks or burrs that could damage the ring during snap‑in – any defects must be removed with fine emery cloth.
Lubricate the ring lightly with clean hydraulic oil or assembly paste. Press the ring into the groove starting at one point and working around the circumference. An audible “click” indicates the snap lip has engaged. Never stretch or twist the ring – if it does not seat easily, check the groove dimensions. The ring should sit flush or slightly below the flange surface (max 0.2 mm protrusion).
Assemble the mating flange or threaded plug using a cross‑torque pattern. Refer to the grader service manual for specific bolt torque (typical M10 flange bolts: 45–50 Nm). After assembly, run the machine at idle and inspect for leaks. If a small seepage is observed, re‑torque bolts to specification – do not overtighten. Always keep spare 860528988 rings in your field repair kit.
Aftermarket snap‑on sealing rings often use lower‑grade rubber with high compression set, causing them to flatten permanently after the first heat cycle – leaks reappear within weeks. Many counterfeit rings lack fabric reinforcement, leading to extrusion and catastrophic blowout at working pressure above 15 MPa. Genuine XCMG rings have the correct Shore hardness and fabric layers.
Counterfeit rings frequently have dimensional errors (ID too large or too small) that prevent proper snap‑in, causing misalignment and immediate leakage. Some are made from reclaimed rubber that swells in contact with hydraulic oil, distorting the seal groove. XCMG rings are precision‑molded from virgin materials and go through 100% dimensional inspection.
XCMG provides a 12‑month warranty against manufacturing defects. Each genuine 860528988 ring is individually bagged with a lot number and XCMG branding. Using OEM seals prevents environmental contamination, reduces fluid consumption, and keeps your grader’s hydraulic system clean. Choose original for reliability and safety.
Visible fluid weeping around a flange joint or threaded plug is the most obvious sign. Other indicators include a drop in hydraulic system pressure, oil stains on the underside of the grader, and the need to frequently top up hydraulic fluid. On transmission housings, a failed sealing ring may allow ATF to mix with coolant (if the seal is between oil and water passages).
Preventive replacement is recommended every 3,000 operating hours or during any major overhaul of the hydraulic system. If the ring is removed for any reason, always install a new one – never reuse an old seal, as the compressed rubber has lost its elasticity. The low cost of a genuine 860528988 ring is tiny compared to the labor of re‑opening a leaking joint.
During routine 500‑hour maintenance, inspect all accessible flange joints for signs of seepage. Use a white cloth to wipe the joint after cleaning – any oil stain indicates a compromised seal. Keep a stock of 860528988 rings in your service vehicle to enable immediate repair without waiting for parts delivery.
The XCMG 860528988 Snap-On Seal Ring is stocked in regional warehouses: 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 for urgent repairs. Bulk orders of 50+ rings receive volume discounts and can be shipped by sea freight.
Each ring is individually sealed in a labeled anti‑ozone bag and packed in rigid cartons to prevent deformation. For large fleets and mining operations, automated replenishment programs ensure you never run out of critical seals. Our customer service team provides real‑time tracking and expedited customs clearance for international shipments.
Don’t tolerate hydraulic leaks that waste oil and create environmental hazards. Order the genuine XCMG 860528988 Snap-On Seal Ring today and restore leak‑free operation on your motor grader. This precision seal is vital for hydraulic integrity, brake circuit reliability, and transmission cleanliness. Keep several rings in every service truck.
Upgrade your grader’s sealing system with XCMG genuine snap‑on rings. Engineered for high‑pressure sealing, chemical resistance, and easy installation. Use the buttons above to request a quote or email our parts specialists. Maintain peak performance and zero leaks – choose 860528988 OEM.
