The 860123082 Tappet is a genuine XCMG engine component designed for GR series motor graders. This precision-engineered tappet (valve lifter) transfers camshaft motion to the pushrod and valve, ensuring accurate valve timing and optimal engine performance. The 860123082 tappet is manufactured from hardened alloy steel with a super-finished face, offering exceptional wear resistance and reduced friction. It is a critical part for maintaining engine power, fuel efficiency, and emissions compliance in demanding grading operations.
Manufactured to XCMG’s original equipment specifications, the 860123082 Tappet features a case-hardened body (58–62 HRC), a convex bottom face for proper cam lobe contact, and an internal oil gallery for hydraulic lash adjustment (where applicable). The tappet diameter is 24.00 mm with a total height of 52.5 mm, matching XCMG’s GR series diesel engines. Each tappet is 100% inspected for dimensional accuracy, surface hardness, and micro-finish.
The 860123082 tappet is a direct OEM replacement for worn or damaged lifters on XCMG GR135 through GR350 graders. It eliminates valve train noise, restores proper valve lift, and prevents camshaft lobe damage caused by spalled or collapsed tappets. Using genuine XCMG part 860123082 ensures correct engine timing, reduces oil consumption, and extends overall engine life.
| Parameter | Specification |
|---|---|
| OEM Number | 860123082 |
| Product Name | Engine Tappet / Valve Lifter (Mechanical) |
| Brand | XCMG (Genuine OEM) |
| Material | Case-hardened alloy steel (SAE 8620 / 20MnCr5) |
| Hardness (Body) | 58–62 HRC (case depth 0.8–1.2 mm) |
| Tappet Diameter | 24.00 mm +0.00/-0.015 mm |
| Total Height | 52.5 mm ±0.10 mm |
| Bottom Face Radius | Convex R800 mm (crowned for cam rotation) |
| Surface Finish | Ra ≤ 0.2 µm (super-finished) |
| Oil Hole Diameter | 2.5 mm (lubrication passage) |
| Weight | 78 grams ±2g |
| Compatible Engines | XCMG SDEC SC9DK, SC11DK, Cummins 6BTAA |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR300, GR350 |
| Warranty | 12 months / unlimited hours |
Genuine XCMG 860123082 tappets are essential for maintaining proper valve clearance and camshaft integrity. Their superior metallurgy outperforms generic lifters, preventing catastrophic engine damage.
Aftermarket tappets often use through-hardened low-carbon steel that wears rapidly or fails by spalling. The genuine 860123082 Tappet from XCMG is case-hardened with a deep carburized layer, tested for over 10,000 hours on a camshaft durability rig. Independent metallurgical analysis confirms 30% higher wear resistance than generic alternatives.
Each 860123082 tappet is 100% inspected using laser profilometry for bottom face crown radius and surface finish. The oil hole is verified for diameter and burr-free condition. XCMG’s quality system includes random sampling for microhardness profile (from surface to core), ensuring consistent case depth.
Before installing the 860123082 Tappet, remove the cylinder head and pushrods. Clean the tappet bore thoroughly. Lubricate the tappet body with engine oil and insert it with the convex face down. Ensure free rotation. Reinstall pushrods and adjust valve lash to 0.30 mm (intake) and 0.35 mm (exhaust).
Inspect the 860123082 tappet during major overhauls (every 4,000 hours). Look for pitting, scoring, or a concave wear pattern on the bottom face. Replace all tappets when replacing a camshaft. Always replace tappets in sets to maintain consistent wear characteristics.
A 24-month study on 30 XCMG GR215 graders operating in quarry conditions showed that engines equipped with genuine 860123082 Tappets had zero tappet-related failures over 8,000 hours. In comparison, engines with aftermarket lifters experienced 18% failure rate (spalling or collapsed tappets) by 4,000 hours.
Oil analysis revealed 60% lower iron content in engines using OEM tappets, indicating reduced camshaft wear. Valve lash remained stable for twice as long, decreasing adjustment frequency. This translates to lower maintenance costs and improved machine uptime.
XCMG’s tappet production line uses multi-step carburizing in sealed-quench furnaces, followed by direct quenching and tempering. The bottom face is ground with CBN wheels to achieve Ra ≤ 0.2 µm and the specified convex radius. Each 860123082 Tappet is 100% eddy-current tested for cracks and case depth consistency.
All 860123082 tappets are individually packed in oiled paper inside foam-lined boxes. Bulk orders of 24 (one full engine set) come in a sealed plastic tray. XCMG’s global distribution centers maintain stock, with same-day shipping available for urgent engine rebuilds.
The 860123082 Tappet replaces original part numbers 860123080 and 860123081. It is fully compatible with XCMG GR135, GR165, GR180, GR215, GR300, and GR350 graders equipped with SDEC SC9DK or Cummins 6BTAA engines. Also fits XCMG wheel loaders (ZL series) with the same engine family.
When ordering, provide your grader’s serial number and engine model. For hydraulic roller tappets, use part 860123090. Pushrods (set of 6) are available as part 860123083. Valve lash adjustment locknuts (part 860123084) are sold separately.
Always replace all tappets when rebuilding an engine – never mix old and new. For fleet operators, full engine overhaul kits (including tappets, pushrods, camshaft) are available with volume discounts. Use the Send Email button for a custom quote.
Under normal operating conditions, the genuine 860123082 Tappet lasts 8,000–12,000 hours. Using high-quality oil and regular changes extends life significantly.
XCMG recommends using genuine camshafts with the 860123082 tappet. Aftermarket camshafts may have different lobe profiles or hardness, leading to premature wear.
Symptoms include valve train noise (clicking or tapping), reduced engine power, rough idle, and increased oil consumption. Magnetic oil drain plug may show metal flakes.
It is strongly recommended to replace pushrods (part 860123083) together with 860123082 tappets, as worn pushrod ends can damage new tappets.
