The Basic Closed Circuit; Case Drain And Heat Exchanger - Danfoss H1T 045 Service Manual

Service Manual
H1T 045/053, 060/068 Axial Piston Tandem Pumps
Introduction

The Basic Closed Circuit

Case Drain and Heat Exchanger

8 | © Danfoss | September 2020
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.
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.
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