Danfoss 51 Series Service Manual

PV
MV
Case
drain
line
Input
Output
Flow (Bi-directional)
Reservoir
P101 170E
The direction and speed of the fluid flow (and motor output shaft rotation) depends on the position of
the pump swash plate. The pump flow and motor displacement determines motor output shaft speed.
The machine load determines the system pressure.
Open circuit
A hydraulic line connects the outlet port of the pump to a directional valve in an open circuit. The main
ports of the motor connect to the working ports of this valve. When the directional valve is actuated, fluid
flows first from the pump to the valve. The directional valve then directs the fluid to the motor in either
direction.
PUMP
MV
Flow
(Unidirectional)
Flow
(Bi-directional)
Input
Output
Case
drain
line
Reservoir
DIRECTIONAL VALVE
P101 171E
The direction of fluid flow (and motor output shaft rotation) depends on the position of the directional
valve. The motor output speed depends on (1) pump output volume, (2) the restriction of the valve
opening and (3) motor displacement. The machine load determines the system pressure. The directional
valve routes fluid returning from the motor to the reservoir. Additional components may be necessary to
provide dynamic breaking and to deal with overrunning loads.
Service Manual
Series 51 and 51-1 Motors
Introduction
10 |
©
Danfoss | March 2016 11008567 | AX00000013en-US0202

Danfoss 51 Series Specifications

General

Brand	Danfoss
Model	51 Series
Category	Engine
Language	English