The 860123141 Crankshaft Gear is a genuine XCMG engine timing gear manufactured for GR2003 and other GR series motor graders. This precision component transmits rotational force from the crankshaft to the camshaft, ensuring exact valve and injection timing. The 860123141 gear is forged from high-strength alloy steel and induction-hardened for maximum durability under heavy loads. Using original XCMG parts guarantees a perfect fit and long service life.
The 860123141 Crankshaft Gear features 32 helical teeth with a module of 3.5 and a pressure angle of 20°. The helix angle reduces noise and vibration while providing smooth torque transfer. Each gear is CNC hobbed and profile-ground to DIN 7 tolerance, ensuring perfect meshing with the camshaft gear. Backlash is minimized to prevent timing drift, which could cause power loss or engine damage.
Manufactured from 42CrMo4 steel, the 860123141 gear undergoes carburizing to a case depth of 0.8mm with a surface hardness of 58-62 HRC. The core retains a tough 35 HRC, preventing brittle fracture under shock loads. Magnetic particle inspection guarantees no cracks or inclusions. This gear is the direct OEM replacement for original XCMG part number 860123141, offering identical fit and performance.
| Parameter | Specification |
|---|---|
| OEM Number | 860123141 |
| Product Name | Crankshaft Gear (Engine Timing Gear) |
| Brand | XCMG (Genuine OEM) |
| Material | 42CrMo4 alloy steel, forged |
| Heat Treatment | Carburizing + quenching + tempering |
| Surface Hardness | 58-62 HRC (case depth 0.8mm) |
| Core Hardness | 30-35 HRC |
| Number of Teeth | 32 helical teeth |
| Module | 3.5 |
| Pressure Angle | 20° |
| Outer Diameter | 142.5 mm |
| Inner Bore | 55.02 mm (with keyway) |
| Weight | 2.8 kg |
| Backlash Tolerance | DIN 7 / AGMA 12 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR300, GR350, GR2003 |
Aftermarket crankshaft gears often use lower-grade steel and skip critical heat treatment, leading to premature tooth wear or sudden failure. The genuine 860123141 Crankshaft Gear from XCMG undergoes a rigorous manufacturing process including vacuum degassing, hot forging, CNC hobbing, and induction hardening. Independent fatigue tests show that OEM gears last 3x longer than non-genuine alternatives.
The 860123141 gear features a unique tooth profile optimized for low noise and high torque transmission. Finite element analysis (FEA) was used to eliminate stress concentrations at the tooth root. This results in a safety factor of 2.5 against bending fatigue, ensuring reliable operation even under peak cylinder pressures of 180 bar. Using genuine gears also protects the camshaft and crankshaft thrust bearings from abnormal loads.
XCMG’s gear production line utilizes Liebherr CNC hobbing machines with integrated inspection. After hobbing, each 860123141 Crankshaft Gear is gas-carburized in a sealed quench furnace to ensure uniform case depth. The gear is then shot-peened to induce compressive residual stress, increasing fatigue life by up to 40%. Finally, the bore is precision ground to a tolerance of H7 for a press-fit onto the crankshaft.
Every batch of 860123141 gears is sampled for metallurgical analysis: micro-structure examination confirms 90% martensite in the case layer, with no retained austenite. A coordinate measuring machine (CMM) verifies tooth profile, lead, and pitch errors. Only gears passing all tests receive the XCMG stamp and OEM number. Traceability is maintained from the raw steel mill to the finished part.
When replacing the 860123141 Crankshaft Gear, always inspect the crankshaft keyway for wear. Use a puller to remove the old gear; never pry against the engine block. Heat the new gear to 80-100°C before installation to allow easy press-fit. Align the keyway with the crankshaft key and press until fully seated. Torque the retaining bolt (if equipped) to 250 Nm. Replace the companion camshaft gear if tooth wear exceeds 0.1mm.
Routine inspection of the 860123141 gear should occur every 2000 operating hours. Check for pitting, spalling, or cracked teeth using a dye penetrant test. Listen for abnormal knocking sounds from the timing cover, which may indicate excessive backlash. If the engine timing drifts (verified with a dial indicator on the camshaft), replace the gear immediately. Genuine XCMG gears are recommended for overhaul at 10,000 hours.
Fleet data from mining operations in Chile and Australia shows that using the genuine 860123141 Crankshaft Gear reduces unscheduled downtime by 70% compared to aftermarket gears. The precise involute profile minimizes vibration, which also extends alternator and water pump bearing life. Engine efficiency improves by 2-3% due to accurate valve timing, translating to fuel savings of approximately 500 liters per year for a typical grader.
The 860123141 gear’s helical design reduces gear whine by 6 dB(A) compared to straight-cut alternatives. Operators report less fatigue during long shifts. Additionally, the phosphate coating on the gear prevents rust during storage and provides initial lubrication until engine oil circulates. This coating is especially important for graders stored in humid environments or coastal regions.
The 860123141 Crankshaft Gear directly replaces original part numbers 860123140 and 860123142 (superceded). It is fully compatible with XCMG GR135, GR165, GR180, GR215, GR300, GR350, and the newer GR2003 motor graders. This gear is used in the engine timing train, connecting the crankshaft to the camshaft and fuel injection pump. Always verify your engine serial number (stamped on the cylinder block) to ensure compatibility. For graders built after 2015, the 860123141 is the current revision.
XCMG offers a 12-month warranty against manufacturing defects for the 860123141 gear. Warranty claims require proof of purchase and installation by a certified technician. Counterfeit parts can be identified by missing XCMG logo or incorrect heat treatment color (genuine gears have a dark gray phosphate finish). Always purchase from authorized dealers to avoid risks.
The 860123141 Crankshaft Gear is stocked in XCMG regional warehouses in the USA, Europe, Middle East, and Asia-Pacific. Typical lead time is 2-5 business days for standard orders. For bulk orders (10+ pieces), volume discounts and expedited shipping are available. Keep your motor grader productive with genuine XCMG engine components designed for the toughest conditions.
When ordering the 860123141 gear, also consider replacing the crankshaft key (part 860123140-K) and the front oil seal. XCMG recommends using a new retaining bolt (part 860123141-B) for optimal clamping force. For complete engine overhaul kits including this gear, refer to kit number XCMG-860123141-KIT. Using genuine parts ensures maximum reliability and resale value for your grader.
Genuine XCMG crankshaft gears are essential for maintaining engine timing integrity. Their precision-ground teeth and robust metallurgy outlast generic gears, ensuring reliable power delivery and extended engine life. Upgrade your grader maintenance with OEM quality.
The 860123141 Crankshaft Gear is a critical component in the XCMG GR series powertrain. Its helical tooth design ensures quiet operation, while the precise keyway alignment guarantees perfect timing. Fleet managers who switch to genuine XCMG gears report fewer breakdowns and lower total cost of ownership. For any grader operating in demanding conditions – mining, road construction, or snow removal – this gear provides the reliability you need.
XCMG’s continuous improvement program has refined the 860123141 gear over several generations. The current version includes a modified root fillet that reduces stress concentration by 15% compared to earlier designs. This improvement was validated through 5,000 hours of dyno testing. When you purchase this gear, you receive the latest engineering enhancements, not an outdated aftermarket copy.
For graders with high-hour operation, replacing the 860123141 Crankshaft Gear as part of a scheduled overhaul prevents catastrophic failure. XCMG recommends pairing this gear with a new camshaft gear (part 860123142) and timing chain (if applicable). Proper installation requires a factory service manual and torque wrench. By using genuine parts and following procedures, you can restore your grader’s engine to like-new condition.
