The d7e has no engine belts because most systems are powered by electricity form the drive system. The belt less design reduces parasitic power drag on the engine and downtime for belt repairs and replacements.
Electric current is routed through the specially armored cables to a solid state power inverter. There advance electronics send AC current to the propulsion module to control the motors and provide DC current for the accessory system. For more information please visit http://www.cat.com/D7E
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