C4934861ZZ XCMG GR2605 motor grader crankshaft

Technical Parameters

• Model: C4934861ZZ
• Type: Engine forged crankshaft
• Material: High-strength alloy steel
• Fit engines: Cummins ISDe6.7, QSB6.7 series
• Structure: Integral fully supported design with main journals, connecting rod journals and thrust locating surfaces
• Precision: Finished journals, qualified dynamic balancing, stable rotation accuracy
• Lubrication: Designed with oil holes for pressurized lubrication
• Application conditions: Heavy-duty, continuous high-load, high-vibration and shock scenarios

Application Scenarios

• Commercial vehicles: Dongfeng Kinland, Tianjin series
• Engineering machinery: Loaders, excavators, motor graders, bulldozers
• Stationary power: Diesel generator sets, water pump units

  Installed in the main bearing seats of the engine cylinder block, connected to pistons via connecting rods, with a flywheel at the rear for power output and front-end drives for valve train and accessories.

Common Faults & Troubleshooting

• Journal wear and scoring: Caused by poor lubrication, contaminated oil or foreign debris, with symptoms of low oil pressure and abnormal noise. Inspect journal dimensions, repair or replace the crankshaft and service the lubrication system.
• Bending deformation and balancing failure: Resulted from engine knock, bearing burnout or foreign object damage, causing severe vibration and unstable operation. Straighten or replace C4934861ZZ crankshaft.
• Cracking and fracture: Occurs due to long-term overload, shock loads or material fatigue, leading to catastrophic engine failure. Replace the crankshaft and inspect cylinder block and internal components.
• Thrust surface wear: Caused by excessive endplay and insufficient lubrication, showing crankshaft movement and shift shock. Check thrust bearing fit and replace crankshaft or thrust washers if needed.
• Oil passage blockage: Sludge and debris buildup leads to lubrication failure and journal burnout. Flush oil passages, replace oil and filter to ensure proper lubrication.