TM 5-3895-373-201.12.4. TrackDriveSystem. The track drive systempropels the paving machine. The track drive system is aparallel system driving both left and right tracks. Maincomponents of the track drive system are as follows:a.Hydraulic Propulsion Motor. The hydraulicpropulsion motor is a two speed fixed displacementmotor. High or low speed selection is made by amoveable internal port plate. The high or low speed portplate position is controlled by a solenoid valve activatedby the travel switch on the operator gauge panel. Themotor shaft mates with the speed reduction gearbox.Hydraulic power to drive the motors is provided by thehydraulic propulsion pumps.b.Speed Reduction Gearbox and Brake. Thespeed reduction gearbox is mounted to the drive hubassembly from inside the paving machine frame. Thegearbox converts a high speed, low torque input to a lowspeed, high torque output. An integral spring appliedhydrostatically released brake engages wheneverhydraulic power is lost, or the control handles are placedin the neutral position.c.Drive Sprocket Gear. The drive sprocket gear isdirectly attached to the drive hub axle internal to the drivehub assembly and connected to the speed reductiongearbox. The axle spins on two sets of conical bearings.The drive sprocket gear is bolted to the outboard face ofthe drive hub assembly.d.Track Idler Roller and TensioningCylinder. The track idler roller slides forward andbackward in the track frame. During operation, the tracktensioning cylinder keeps a constant load on the idlerroller, removing slack from the track chain.e.Track Rollers. Track rollers support the trackchain. Two track rollers are mounted to the top of thetrack frame, and eight are mounted to the bottom of thetrack frame.f.Track Chain. The track chain consists ofinterconnected links where each link has a track guideand hardened rubber track pad. This provides a largesurface contact area with the ground. The track chainprovides the travelling surface for the paving machineand creates traction to allow movement.1-9
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