The System Circuit; The Basic Closed Circuit - Danfoss 90 Series Service Manual

Service Manual
Introduction
Cross section
Slider block
Bushing
Cylinder block
Valve plate
Rear
bushing
Charge pump

The system circuit

8
Series 90 Pumps
Servo piston

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 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.
520L0818 • Rev 0101 • August 2015
Piston
Servo arm
Swashplate
Slipper
Displacement control
Feedback linkage
Cradle bearing
Roller bearing
Shaft
seal
Input shaft
Cradle guide
P106 648E