| Parameter | Specification |
|---|---|
| OEM Number | 860123893 |
| Brand | XCMG (Original Equipment) |
| Type | Top compression ring – trapezoidal profile (15° angle) |
| Material | Ductile cast iron (GGG70) with chrome-ceramic plasma coating |
| Bore Diameter (compatible) | 102.00 mm |
| Ring Width (axial height) | 3.00 mm ±0.01 mm |
| Radial Thickness | 4.50 mm ±0.02 mm |
| Trapezoid Angle | 15° (tapered face) |
| Coating Hardness | HV 800–1000 (chrome-ceramic) |
| End Gap (installed) | 0.35 – 0.55 mm |
| Max Operating Temperature | 450°C (combustion zone) |
| Surface Finish | Ra 0.2 – 0.4 μm, phosphate coated for break-in |
| Quantity per Engine | 6 pieces (one per cylinder) |
| Compatible XCMG Graders | GR135, GR165, GR180, GR200, GR2003, GR215, GR260, GR300 |
The genuine 860123893 trapezoidal ring features a 15° tapered face that creates a wedge effect during the power stroke. This geometry forces the ring against the cylinder wall, improving combustion gas sealing while reducing oil film thickness for lower friction. Unlike rectangular rings, the trapezoidal design minimizes carbon buildup in the ring groove, preventing sticking even after thousands of hours of operation.
The ring’s profile also enhances conformability to out-of-round cylinder bores. The radial wall thickness is optimized to provide sufficient tension (15–20 N) without excessive wear. This balance ensures that the 860123893 ring maintains consistent compression across all cylinders, reducing blow-by by up to 50% compared to worn rings.
The 860123893 ring is coated with a plasma-sprayed chrome-ceramic layer (Cr₂O₃ + Al₂O₃) that provides exceptional scuff resistance and hardness (HV 800-1000). This coating withstands peak cylinder pressures up to 22 MPa and reduces wear rate to less than 0.005 mm per 1,000 hours. In field tests on GR2003 graders, rings retained 95% of original coating after 12,000 hours, outperforming nitrided steel rings by 3:1.
The phosphate underlayer promotes rapid break-in during the first 50 hours of operation, ensuring immediate compression sealing. The coating also resists corrosive attack from EGR acids and low-quality fuel. Genuine XCMG rings are 100% inspected for coating adhesion and porosity using a computerized vision system.
Engines rebuilt with genuine 860123893 trapezoidal rings show a 4-6% improvement in fuel economy due to reduced blow-by and optimized oil control. Compression pressures return to factory specifications (350–380 psi), resulting in easier cold starts and reduced white smoke. Oil consumption typically drops below 0.1% of fuel consumption, minimizing top-up intervals.
Dynamometer tests confirmed that the trapezoidal ring reduces hydrocarbon emissions by 15% compared to standard rectangular rings. The superior sealing also protects the turbocharger from oil contamination, extending turbo life. For fleet operators, the 860123893 ring set pays for itself within 2,000 hours through fuel savings alone.
When installing the 860123893 ring, first verify that the piston ring groove is clean and undamaged. Use a ring expander to avoid overstressing the ring. Install the ring with the marked side facing up (toward cylinder head). Stagger the ring end gaps 120° apart from the second compression ring and oil ring.
Measure end gap by inserting the ring squarely into the cylinder bore at the lowest wear position. Acceptable gap: 0.35–0.55 mm. If too tight, file the ends carefully with a ring file. Never file the ring’s inner diameter. Lubricate the ring and groove with engine oil before assembly. After installation, rotate the ring in the groove to ensure free movement.
Counterfeit trapezoidal rings often use lower-grade gray iron with inconsistent hardness, leading to rapid wear and ring breakage. Some fakes lack the chrome-ceramic coating, causing scuffing within 500 hours. Genuine 860123893 rings are manufactured in an IATF 16949 certified facility, with 100% dimensional and hardness inspection. Each ring is laser-etched with the XCMG logo and part number for traceability.
Using OEM rings preserves engine warranty and ensures compatibility with XCMG’s cylinder bore finish specifications. The 860123893 also includes a phosphate coating that prevents rust during storage. Don’t risk piston seizure or cylinder wall damage – choose genuine XCMG quality.
Trapezoidal profile reduces combustion gas leakage by 50%.
Hardness HV 800-1000, 3x longer life than nitrided rings.
4-6% better fuel economy, pays for itself quickly.
Signs of worn or damaged trapezoidal rings include excessive blow-by (crankcase pressure), blue exhaust smoke, low compression, and oil fouling of spark plugs (in gas engines) or injectors. Perform a compression test – if pressure is low and does not improve with oil added, rings are likely worn. Also conduct a cylinder leakage test; more than 20% leakage past rings indicates replacement is needed.
When replacing rings, always hone the cylinder bore to restore cross-hatch pattern (280-320 grit). Measure ring groove clearance – if side clearance exceeds 0.10 mm, the piston must be replaced. Never reuse old rings. Always replace all rings in a set (compression and oil rings). The 860123893 is sold individually; order six pieces for a full engine set.
Store spare rings in original packaging, flat, away from moisture and direct sunlight. Shelf life is 5 years. Before installation, verify the ring orientation marking. Incorrect installation (upside down) will cause excessive oil consumption and blow-by.
XCMG’s global parts network stocks the 860123893 trapezoidal ring in regional warehouses across North America, Europe, Asia, Middle East, and Africa. Typical lead time: 2-4 business days for air freight. Bulk orders (50+ pieces) qualify for sea freight discounts and custom packaging.
For fleet customers, we offer engine overhaul kits that include rings, bearings, gaskets, and liners. Contact our parts specialists via the buttons above to request a quote, technical drawing, or installation video. We also provide cylinder honing specifications and torque sequences for complete rebuilds.
*All specifications based on XCMG original equipment standards. Always replace rings as a full set. OEM number 860123893 is a registered XCMG component. Images are representative; actual product may vary.
For any inquiries regarding the 860123893 XCMG Trapezoidal Ring or other motor grader engine components, contact our team via the “Send Email” or “Inquiry Now” buttons above. We provide genuine parts, fast delivery, and expert technical support to keep your fleet operating reliably.
