TM 5-3895-373-201.19.PUMPDRIVESYSTEM.The hydraulic pump drive system consists of the pavingmachine engine, pump drive gearbox, and five hydraulicpumps.The Perkins T4.236 turbosupercharged diesel engineflywheel is shaft coupled to the input of the attachedpump drive gearbox. The gearbox input drives twooutput gears at a 1:1 input-to-output ratio.There are five hydraulic pumps attached in a tandemconfiguration to the oil-filled gearbox. Coupled directly tothe gearbox are two hydraulic propulsion pumps. Theyprovide 5000 psi (34 500 kPa) at 2.8 cu in./rev (46,6cc/rev) to the left and right hydraulic propulsion motors.Attached in tandem to the right propulsion pump is oneshaftdriven auxiliary hydraulic pump with two outputs.One output provides 0.7 cu in./rev (11,6 cc/rev) while thesecond output provides 0.58 cu in./rev (9,67 cc/rev), bothat 2500 psi (17 200 kPa). Attached to the left propulsionpump is a hydraulic auxiliary vibration pump thatprovides 0.24 cu in./rev (4,00 cc/rev) at 2000 psi (13 800kPa). Connected to the vibration pump is a secondauxiliary pump with two outputs, the same as theauxiliary pump on the right side.Both outputs of the left auxiliary pump, and the 0.7 cuin./rev (11,7 cc/rev) output of the right auxiliary pump, areused for the auger/conveyor motor. The 0.58 cu in./rev(9,67 cc/rev) output of the right auxiliary pump is splitthrough a 50/50 flow divider. Half the fluid is used for thestack valve (screed extension, hopper lift, tracktensioning, and screed lift cylinders). The other half ofthe output fluid is used for tow point cylinders and tosupplement screed vibration.1-35
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