High-pressure pump/side module Hydraulic Auxiliary Drive (HAD) High-pressure pump The hydraulic pressure and volumetric flow required to drive the wheel hub motors are produced by a high-pressure pump. The high-pressure pump is located on a modified timing case beside the power steering pump. On engine OM 470 the rear PTO is not installed. The high-pressure pump delivers a volumetric flow of up to 350 l/min. The power output of the high- pressure pump is 112 kW, of which 40 kW is avail- able to each wheel hub motor. At a maximum pump pressure of p = 420 bar, a torque of up to 12500 Nm can be built up at the front axle.
W55.90-1003-00 4 High-pressure pump 5 Expansion reservoir Side module The side module is attached to the right side of the frame. It consists of: Hydraulic fluid cooler with fan Hydraulic fluid tank Hydraulic fluid filter Control block The HAD is controlled via the transmission control module (TCM) (A5). The transmission control module (TCM) transmits the control parameters to the Hydraulic Auxiliary Drive (HAD) control unit (A83), which actuates the hydraulic pump, the control block and the fan in the cooling module.
W55.90-1002-00 6 Hydraulic fluid cooler with fan 7 Hydraulic fluid tank 8 Hydraulic fluid filter 9 Control block i Note Information on the HAD system is stored in WIS under the function (sub-) group 55.90. 47 i Introduction of the New Truck Generation - The New Arocs (Model 964) – This printout will not be recorded by the update service. Status: 01 / 2013 –