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A drive shaft is a mechanical component for transmitting torque and rotation, usually used to connect other components of a drive train that cannot be connected directly because of distance or the need to allow for relative movement between them..
A bushing, also known as a bush, is an independent plain bearing that is inserted into a housing to provide a bearing surface for rotary applications. The bushings in the gear pump provide a bearing surface for the drive gear and idler gear.
The gear pump uses two identical gears rotating against each other. One gear is driven by a motor and it in turn drives the other gear. Each gear is supported by a shaft with bushings on both sides of the gear.
This is a seal that is placed between the drive shaft and the main case of the gear pump.