English – 11
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
DXR250, DXR270
: 0-65 l/min (0-17 gal/
min)
DXR300, DXR310
: 0-75 l/min (0-20 gal/min).
Main pressure
The hydraulic system has different pressure levels.
*Elevated main pressure is used only for the outriggers/dozer blades and when operating some tools.
If several functions are used at the same time the pressure will be set to lowest value.
If the oil temperature raises above 176
°
F (80
°
C) the hammer pressure will automatically be decreased to make the
machine able to run longer before it is overheated.
Cooler
The cooler has an integrated bypass valve that protects against overpressure in conjunction with, for example, cold start.
DXR250
DXR270
DXR300
DXR310
Standard pressure, bar
200
200
200
200
Increased main pressure*, bar
250
250
250
250
Track tensioning and outriggers/dozer
blades up, 2,900 psi.
200
200
200
200
Hydraulic hammer, bar.
150 (19 kW)
150 (19 kW)
160 (22 kW)
160 (22 kW)
Pressure cut-off (Telescopic arm), bar
-
-
-
180
Summary of Contents for DXR-310
Page 75: ...English 75 TECHNICAL DATA Range and transport diagram DXR250 4483 176 5 2020 79 5 4815 189 5 ...
Page 77: ...English 77 TECHNICAL DATA DXR270 4483 176 1986 78 4849 191 1435 56 ...
Page 79: ...English 79 TECHNICAL DATA DXR300 4868 192 2368 93 5231 206 1818 72 ...
Page 81: ...English 81 TECHNICAL DATA DXR310 5182 204 2129 84 2678 105 5549 218 ...
Page 84: ...1158619 27 z Z 78 z Z 78 2016 12 19 US Original instructions ...