HYDRAULIC PROPULSION PUMPS.
Two separate variable displacement hydraulic propulsion
pumps are directly coupled to the pump drive gearbox.
The propulsion pumps are identical models and are used
to drive the left and right hydraulic propulsion motors.
Each includes an electric displacement control pump
pilot control valve that provides a continuously variable
AUXILIARY HYDRAULIC PUMPS.
Three separate auxiliary hydraulic pumps are attached to
the hydraulic propulsion pumps. Two identical 2500 psi
(17 237 kPa) auxiliary hydraulic pumps power the auger/
conveyor assemblies, tow point cylinders, screed, and
stack valve. Displacement for the two pumps is 0.70
cubic inches (11,5 ml) in front and 0.58 cubic inches (9,5
ml) in rear.
A 2500 psi (17 237 kPa) hydraulic auxiliary vibration
pump supplies additional power to the screed vibration
displacement per revolution of 0.24 cubic inches (3,9
ml). Each pump is mechanically linked by spline shafts
to the hydraulic propulsion pumps.