| Parameter | Specification |
|---|---|
| OEM Number | 860126146 |
| Brand | XCMG (Original Equipment) |
| Valve Type | Intake Valve – Overhead, 45° seat angle |
| Material | 21-4N heat-resistant alloy steel, Stellite-coated face |
| Head Diameter | 48.0 mm ±0.05 mm |
| Stem Diameter | 9.0 mm – 9.02 mm (Chrome plated) |
| Overall Length | 148.5 mm ±0.2 mm |
| Stem Hardness | HRC 34 – 38 |
| Tip Hardness | HRC 48 – 52 (Induction hardened) |
| Seat Angle | 45°, concentricity ≤0.03 mm |
| Max Operating Temp. | 850°C continuous |
| Compatible XCMG Graders | GR135, GR165, GR180, GR200, GR2003, GR215, GR260 series |
| Valve Lock Groove | Single groove, precision broached |
| Coating | Hard chrome / optional PVD on tip |
The genuine XCMG 860126146 intake valve is forged from premium silicon-chromium 21-4N steel, solution-annealed and age-hardened to achieve exceptional fatigue strength. The valve face receives a stellite (cobalt-based) overlay, reducing wear by 40% compared to generic alternatives. This metallurgical advantage ensures stable performance even under extreme thermal cycling.
Every 860126146 valve undergoes 100% eddy current testing and magnaflux crack detection. The stem is micro-polished to reduce guide bore friction, while the chromed surface prevents corrosion and galling. XCMG’s strict quality protocol guarantees that each intake valve meets OEM runout tolerance ≤0.03mm, eliminating valve leakage and compression loss.
Part number 860126146 is the direct replacement for XCMG motor graders equipped with 6-cylinder diesel engines (models GR135 through GR300). It supersedes old numbers 860126145 and 612630080021. Identical to factory-installed components, it fits cylinder heads without any modification.
While compatible with some SDLG and other Chinese heavy equipment, always verify the OEM stamp 860126146 on the valve head. The seat angle of 45° and exact stem protrusion ensure proper valve clearance and heat dissipation, maximizing engine life.
Independent lab tests confirm that genuine 860126146 valves exceed 12,000 operating hours in heavy-duty grading applications without pitting or stem bending. The martensitic structure offers 30% higher fatigue resistance than aftermarket copies. Users report smoother idling, reduced blue smoke on cold start, and consistent compression across all cylinders.
The valve’s superior thermal conductivity eliminates hot spots, preventing pre-ignition and valve burning. Backed by XCMG’s ISO 9001:2015 certified production, every batch includes a certificate of conformance and full traceability.
When installing the 860126146 intake valve, always clean the guide bore, apply molybdenum disulfide assembly lube, and verify stem-to-guide clearance (0.035-0.065mm). Replace valve stem seals simultaneously. Lap the valve seat with 240/400 grit paste to achieve a continuous matte grey finish.
Torque the valve locks to 22-25 N·m and ensure keepers are fully seated. After reassembly, run the engine at low idle for 15 minutes. Regular valve lash adjustment (intake: 0.25mm cold) maintains optimal timing. Inspect every 2000 hours for abnormal wear, carbon deposits, or stem end deformation.
Counterfeit intake valves often use inferior 40Cr steel and lack proper heat treatment, leading to premature tuliping or head separation. Genuine 860126146 valves undergo million-cycle fatigue tests and maintain consistent stem hardness. Avoiding engine knocking and catastrophic failures is possible only with OEM parts.
Using genuine XCMG components preserves equipment resale value and maintains warranty compliance. The 860126146 intake valve meets EPA/CARB off-road diesel emission standards when installed correctly. Each valve arrives with anti-rust coating and individual XCMG branded packaging.
Withstands 850°C continuous, stellite face prevents oxidation.
12,000+ hours field-proven in motor graders.
Drop-in replacement for all XCMG grader engines.
The 860126146 intake valve features a hardened tip with Rockwell HRC 50 minimum, reducing wear against rocker arms. The fillet radius between head and stem is optimized to eliminate stress risers. Additionally, the valve lock groove geometry is precisely broached to prevent retainer loosening at high rpm.
For maximum engine performance, pair the XCMG 860126146 intake valve with genuine valve guides, seals, and seat inserts. Complete valvetrain refresh extends engine life by up to 25%. Avoid mixing with worn components to prevent premature failure.
In extreme dusty or arctic environments, reduce maintenance intervals by 20% and use high-quality diesel engine oil (API CK-4 or higher). Regular valve rotation (if applicable) is not required for this fixed geometry design, but proper lash setting remains critical.
All XCMG 860126146 valves are produced in an IATF 16949 certified facility. Dimensional accuracy is verified using laser micrometers, and thermal shock testing from -30°C to 900°C ensures reliability in any climate. Keep spare valves in original packaging to avoid contamination.
*All technical data based on XCMG original equipment standards. Always consult your machine’s service manual before installation. Part number 860126146 is a registered OEM component.
For any inquiries regarding the 860126146 XCMG Intake Valve or other grader parts, please contact our support team via the “Send Email” or “Inquiry Now” buttons above. We provide genuine parts with global shipping and technical assistance.
