C5314776 XCMG GR2605 motor grader main bearing cap

Introduction

Technical Parameters

• Part Number: C5314776 (5314776)
• Brand: DCEC Cummins
• Type: Engine Main Bearing Cap (Crankshaft Main Bearing Cap)
• Material: QT500-7 ductile iron (mainstream specification), 319S semi-solid aluminum alloy (after solution treatment + aging strengthening treatment) for some lightweight specifications
• Fit Engines: Cummins ISB6.7, ISDe4.5, ISDe6.7, QSB6.7, B5.9 series (complementing C5314775 to adapt to different main journal positions)
• Structure: Split arch-shaped structure, with main bearing installation groove, positioning pin hole and high-strength bolt installation hole; some specifications integrate reinforcing ribs to optimize structural strength, which accurately matches the contour of the cylinder block main bearing seat and fits closely with the main bearing and crankshaft.
• Key Dimensions: Length 120mm, width 88mm, height 65mm, inner diameter of bearing installation groove φ76.2mm (adapted to the corresponding crankshaft main bearing size, slightly different from C5314775 for complementary adaptation)
• Surface Treatment: Phosphating anti-rust treatment on the surface, precision machining and polishing of the inner wall of the bearing installation groove to reduce the friction coefficient and avoid main bearing wear
• Installation Method: Fastened crosswise to the cylinder block main bearing seat with high-strength bolts, accurately aligned with positioning pins, and must be installed with the corresponding main bearing
• Cross Reference: 3971019, 5309277, 5311272 (interchangeable, distinguished from C5314775 cross reference for adaptation)
• Weight: Approximately 2.9kg per piece for cast iron type, 1.65kg per piece for aluminum alloy type
• Applicable Parts: Corresponding main journal position of the engine cylinder block main bearing seat, multiple pieces installed on each engine (installed separately from C5314775) to jointly support crankshaft operation

Application Scenarios

• Vehicles: Medium and heavy-duty trucks and buses equipped with ISDe/ISB/QSB series engines, such as Dongfeng Kinland, Tianjin, Dali Shen, Auman, adapting to installation needs at different main journal positions
• Construction Machinery: 18–26 ton loaders, graders, bulldozers, excavators (QSB6.7, B5.9 engines), forklifts, cranes and other construction equipment, adapting to high-intensity compaction, excavation and other operation scenarios
• Conditions: Harsh environments such as heavy-duty long-distance, mining sites, high-altitude and cold areas, high temperature and high humidity, frequent starts and stops, high-frequency vibration, and can adapt to the high-strength working requirements of turbocharged engines, tolerating high dust and strong impact working conditions
• Location: Corresponding main journal position of the main bearing seat at the bottom of the engine cylinder block, installed separately from C5314775 main bearing cap, accurately aligned with the cylinder block through positioning pins, fastened with high-strength bolts, covering the corresponding main bearing installation area
• Functions: Fix the position of the main bearing, support the stable operation of the crankshaft, limit the axial displacement of the crankshaft, disperse the dynamic load generated by crankshaft operation and the explosion pressure of the combustion chamber, provide the installation benchmark for the lubrication channel, prevent crankshaft operation deviation and main bearing wear, work together with C5314775 to ensure stable engine power transmission, and extend the service life of the crankshaft and main bearing.