Crankshaft
曲轴将气缸中的燃烧力转变为有效旋转力矩。 曲轴前端使用减振器来减轻会对发动机造成损坏的扭振（扭曲）。
曲轴驱动位于发动机前端和后端的一组齿轮。 发动机前端的齿轮组驱动机油泵、水套水泵、燃油输油泵和附属驱动装置。
后齿轮总成驱动凸轮轴和附属驱动装置。
曲轴两端使用了油封和耐磨套筒。 3508 曲轴由五个主轴承固定在位。 3512 曲轴由七个主轴承固定在位。 3516 曲轴由九个主轴承固定在位。 中央主轴承两侧的止推板控制曲轴的端隙。
Caterpillar Information System:
621G Wheel Tractor-Scraper Ether Starting Aid Cylinder - Replace
924G and 924GZ Wheel Loaders Machine Systems Window Wiper and Wiper Motor (Front) - Remove and Install
3408E and 3412E Engines for Caterpillar Built Machines CID 0190 FMI 03 Engine Speed open/short to + batt
621G Wheel Tractor-Scraper Plate Locations and Film Locations
D8R Series II Track-Type Tractor Pivot Shaft Oil Level - Check
3408E and 3412E Engines for Caterpillar Built Machines CID 0175 FMI 04 Engine Oil Temperature short to ground
623G Wheel Tractor-Scraper Plate Locations and Film Locations
3408E and 3412E Engines for Caterpillar Built Machines CID 0175 FMI 03 Engine Oil Temperature open/short to +batt
3456 Engine, 836G Landfill Compactor, 834G Wheel Dozer and 988G Wheel Loader CID 0174 FMI 04 Fuel Temperature short to ground
3114, 3116 and 3126 MUI Engine Governors Throttle Lever (Types IV, V, VI, VII, and Some III) - Install
621G Wheel Tractor-Scraper Model View Illustrations
D8R Series II Track-Type Tractor Lift Cylinder Yoke Bearings - Lubricate
3500B and 3500B High Displacement Generator Set Engines Camshaft
3516B Generator Set Engines with Dynamic Gas Blending Electrical System Operation
621G Wheel Tractor-Scraper Fan Drive Bearing and Belt Tightener - Lubricate
D8R Series II Track-Type Tractor Transmission System Oil Level - Check
3456 Engine, 836G Landfill Compactor, 834G Wheel Dozer and 988G Wheel Loader CID 0190 FMI 02 Loss of Engine Speed Signal
D8R Series II Track-Type Tractor Winch Control - If Equipped
637G Wheel Tractor-Scraper Fan Drive Bearing and Belt Tightener - Lubricate
D8R Series II Track-Type Tractor Window Washer Reservoir - Fill - If Equipped
Procedure for Field Replacement of the Fuel Tank Sender on D8R Track-Type Tractors That Are Equipped With a Cab{1273} Procedure for Field Replacement of the Fuel Tank Sender on D8R Track-Type Tractors That Are Equipped With a Cab{1273}
D8R Series II Track-Type Tractor Window Wipers - Inspect/Replace - If Equipped
627F Wheel Tractor-Scraper Operation Information
3408E and 3412E Engines for Caterpillar Built Machines CID 0190 FMI 07 Primary Speed Sensor misinstalled