Above schematics show the function of an H1 tandem axial piston variable displacement pump with
electric displacement control (EDC) and optional control cutoff valve.
The system circuit
The basic closed circuit
Hydraulic lines connect the main ports of the pump to the main ports of the motor. Fluid flows in either
direction from the pump to the motor and back. 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.
Case drain and heat exchanger
The pump and motor require case drain lines to remove hot fluid from the system. The pump and motor
drain from the topmost port to ensure the cases remain full of fluid. The motor case drain can connect to
the lower drain port on the pump housing or it can tee into the case drain line upstream of the heat
exchanger. A heat exchanger with bypass valve cools the case drain fluid before it returns to the
reservoir.
Service Manual
H1 45/53/60/68 Tandem Closed Circuit Axial Piston Pumps
Introduction
©
Danfoss | June 2018 520L0928 | AX00000103en-US0303 | 9
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