Husqvarna DXR300, Operator'S Manual

Page: 8 / 60

8 –
English
HYDRAULIC SYSTEM
General
The task of the hydraulic system is to operate the machine’s
functions by means of hydraulic pressure and flow. The
system consists of hydraulic pump, tank, cooler, hydraulic
motor, hydraulic cylinders, filters and valves of various kinds.
Hoses or pipes connect the components with each other.
Valves are used to control the hydraulic system’s pressure,
volume rate of flow and direction. Pressure control valves limit
or reduce the pressure to the value required. Volume control
valves affect the hydraulic oil’s flow and thereby the speed of
the functions. Direction control valves direct the hydraulic oil
to the machine’s different functions.
The hydraulic pump is of the variable displacement type and
delivers a flow of 0-65 l/min (0-17 gal/min).
Main pressure
The hydraulic system has different pressure levels.
• Track tension and outriggers up 200 bar.
• Hydraulic hammer 165 Bar (22 kW)
• Standard pressure is 200 Bar
• Increased main pressure is 250 Bar
Increased main pressure is used when the outriggers are
extended and when running arm system inward in parallel
motion.
If several functions are used at the same time the pressure
will be set to lowest value.
Cooler
The cooler has an integrated bypass valve that protects
against overpressure in conjunction with, forÊexample, cold
start.