H1 Single Pumps Closed Circuit Pictorial Diagram - Danfoss H1P 045 Service Manual

Service Manual
H1P 045/053/060/068 Axial Piston Single Pumps
Introduction
The Basic Closed Circuit
Case Drain and Heat Exchanger

H1 Single Pumps Closed Circuit Pictorial Diagram

Displacement Control
Servo Control
Cylinder
Variable
Displacement
Pump
Input
Shaft
Pump Swashplate
© Danfoss | June 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.
Heat Exchanger
Bypass Valve
Heat Exchanger
Pressure
Limiter
Valve
Reservoir
Charge Pump
Charge Filter
Charge Check/
High Pressure Relief Valve
Loop
Flushing
Valve
Charge
Pressure
Relief
Valve
To Pump
Case
Charge Check/High Pressure Relief Valve
System Pressure
Servo Pressure
Charge/Low Loop Pressure
Suction/Case Drain/
System Return
Bent Axis Variable
Displacement Motor
Motor Swashplate
Output
Shaft
To
Synchronizing
Motor
Shaft
Case
P104 464E
AX152886481964en-000405 | 9