The system circuit
The basic closed circuit
The main ports of the pump are connected by hydraulic lines to the main ports of the motor. Fluid flows,
in either direction, from the pump to the motor then back to the pump in this closed circuit. Either of the
hydraulic lines can be under high pressure. In pumping mode the position of the pump swashplate
determines which line is high pressure as well as the direction of fluid flow.
A tandem circuit contains two pumps and motors. Each pump and motor circuit is similar to the one
shown.
Case drain and heat exchanger
The pump and motor case drain lines remove hot fluid from the system. The pump and motor should be
drained from their top most drain port to ensure the case remains full of fluid. The motor case drain can
be connected to the lower drain port on the pump housing and out the top most port or feed into the
case drain line coming from the pump ahead of the heat exchanger. A heat exchanger, with a bypass
valve, is required to cool the case drain fluid before it returns to the reservoir.
Service Manual
Series 40 M46 Tandem Variable Pumps
Introduction
©
Danfoss | September 2017 11029852 | AX00000030en-US0202 | 7
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