| Parameter | Specification |
|---|---|
| OEM Number | 860123127 |
| Brand | XCMG (Original Equipment) |
| Type | Fully floating piston pin (wrist pin) |
| Material | Case-hardened alloy steel (20MnCr5 / SAE 8620 equivalent) |
| Outer Diameter | 45.00 mm ±0.0025 mm |
| Inner Diameter | 25.00 mm ±0.005 mm |
| Length | 85.00 mm ±0.05 mm |
| Surface Hardness (case) | HRC 58–62 (depth 0.8–1.2 mm) |
| Core Hardness | HRC 30–38 |
| Surface Finish (Ra) | 0.10 – 0.20 μm |
| Max Radial Load | 60 kN |
| Operating Temperature | -40°C to +200°C |
| Quantity per Engine | 6 pieces |
| Compatible XCMG Graders | GR135, GR165, GR180, GR200, GR2003, GR215, GR260, GR300 |
The genuine 860123127 piston pin is manufactured from case-hardening alloy steel (20MnCr5) that provides a tough, ductile core and a hard, wear-resistant outer layer. The carburizing process creates a case depth of 0.8–1.2 mm with HRC 58–62 hardness, while the core maintains HRC 30–38 for impact resistance. This combination prevents bending or cracking under peak cylinder pressures up to 22 MPa.
Each pin is centerless-ground to an outer diameter tolerance of ±0.0025 mm, ensuring a perfect fit in both the piston boss and connecting rod small end. The surface is super-finished to Ra 0.10–0.20 μm, reducing friction and promoting oil film retention. XCMG’s quality control includes 100% magnetic particle inspection for surface cracks.
The 860123127 pin features a fully floating design, meaning it rotates freely in both the piston and connecting rod. This distributes wear evenly across the entire pin surface and reduces localized stress. Oil holes in the connecting rod small end provide pressurized lubrication to the pin, forming a hydrodynamic film that eliminates metal-to-metal contact.
In endurance tests on GR2003 graders, genuine 860123127 pins showed less than 0.002 mm diameter wear after 10,000 hours. Aftermarket pins often lack proper case hardening, leading to galling and piston seizure. Trust XCMG for maximum reliability.
The 860123127 piston pin has been validated to 200 million alternating load cycles at 60 kN without failure. The smooth transition between the pin body and chamfered ends eliminates stress risers. Finite element analysis confirms a safety factor of 3.5 against yielding, ensuring safe operation even under extreme lugging conditions.
Engines rebuilt with genuine XCMG pins show quieter operation, reduced piston slap, and lower oil consumption. The pin’s precise mass (approx. 480 grams) is balanced to reduce reciprocating forces, improving engine smoothness.
Before installing the 860123127 pin, measure the piston boss bore and connecting rod small end bore. Acceptable clearances: piston boss 0.005–0.015 mm interference fit (pin is pressed into piston at room temperature), connecting rod 0.015–0.030 mm clearance for floating operation. If clearances are outside spec, replace the piston or rod.
Lubricate the pin with engine oil and insert it through the piston and rod using a press (never hammer). Ensure the retaining rings (circlips) are fully seated in their grooves. Rotate the pin to confirm free movement in the rod. Always install new circlips – never reuse old ones.
Counterfeit piston pins often use through-hardened low-carbon steel that is too brittle, leading to cracking. Others have incorrect diameter or poor surface finish, causing premature wear. Genuine 860123127 pins are manufactured in an IATF 16949 facility, with 100% non-destructive testing and dimensional verification. Each pin is laser-etched with the XCMG part number.
Using OEM pins preserves engine warranty and ensures proper piston/rod compatibility. The 860123127 also includes a rust-preventive oil coating. Don’t risk a catastrophic engine failure – choose genuine XCMG.
HRC 58-62 case, tough core for high impact resistance.
±0.0025 mm OD tolerance, Ra 0.10-0.20 μm finish.
10,000+ hours field-proven, zero galling.
Symptoms of a worn or damaged piston pin include a metallic knocking noise (especially on cold start or under load), increased piston slap, and metal particles in the oil. To diagnose, remove the oil pan and inspect the pin for scoring or discoloration. Measure the pin diameter at multiple points – if worn more than 0.01 mm from nominal, replace.
When replacing pins, always install a full set of six. Also inspect the piston pin bores for ovality or scoring; if damaged, replace the piston. Check connecting rod small end bushings for wear; replace if clearance exceeds 0.05 mm. The 860123127 pin should slide smoothly in the rod bushing with no perceptible play.
Store spare pins in original packaging, protected from moisture. Shelf life is 5 years. Before installation, verify the pin diameter with a micrometer. Do not use pins that show signs of rust or pitting.
XCMG’s global parts network stocks the 860123127 piston pin 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+ pins) qualify for sea freight discounts and custom packaging.
For fleet customers, we offer engine overhaul kits that include pins, rings, bearings, and gaskets. Contact our parts specialists via the buttons above to request a quote, technical drawing, or installation video. We also provide pin fitting instructions and torque specifications for circlip installation.
*All specifications based on XCMG original equipment standards. Always measure clearances before assembly. OEM number 860123127 is a registered XCMG component. Images are representative; actual product may vary.
For any inquiries regarding the 860123127 XCMG Piston Pin 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.
