Liebherr LB 28 - Manual (Page 15)

LB 28 15
Technical description
Hydraulic system
The main pumps are operated by a distributor gearbox. Axial piston
displacement pumps work in open circuits supplying oil only when
needed (flow control on demand).
The hydraulic pressure peaks are absorbed by the integrated
automatic pressure compensation, which relieves the pump and
saves fuel.
Pumps for working tools 2x 92.5 gal/min
Separate pump for kinematics 47.5 gal/min
Hydraulic oil tank 211 gal
Max. working pressure 5076 PSI
The cleaning of the hydraulic oils occurs via an electronically
monitored pressure and return filter.
Any clogging is shown on the display in the cab.
The use of synthetic environmentally friendly oil is also possible.
Swing
Consists of triple-row roller bearing with external teeth and two
swing drives, fixed axial piston hydraulic motor, spring loaded and
hydraulically released multi–disc holding brake, planetary gearbox
and pinion. Selector for 3 speed ranges to increase swing precision.
Swing speed from 0 – 2 rpm is continuously variable.
Auxiliary winch
Line pull effective (1 st layer) 22,480 lbf
Rope diameter 20 mm
Line speed 0-292 ft/min
Crawlers
Propulsion through axial piston motor, hydraulically released spring
loaded multi–disc brake, maintenance-free crawler tracks, hydraulic
chain tensioning device.
Drive speed
0 – 1.1 mph
Track force 153,095 lbf
Width of 3-web grousers (option 31.5 inch) 35.4 inch
Control
The control system – developed and manufactured by Liebherr – is
designed to withstand extreme temperatures and the many heavy–
duty construction tasks for which this machine has been designed.
Complete machine operating data are displayed on a high resolution
monitor screen. A GSM/GPRS telematics module allows for remote
inquiry of machine data and operational conditions. To ensure clarity
of the information on display, different levels of data are shown in
enlarged lettering and symbols.
Control and monitoring of the sensors are also handled by this high
technology system. Error indications are automatically displayed on
the monitor in clear text. The machine is equipped with proportional
control for all movements, which can be carried out simultaneously.
Two joysticks are required for operation. Pedal control can be
changed to hand control.
Option:
PDE
® : Process data recording
Noise emission
Noise emissions correspond with 2000/14/EC directive on noise
emission by equipment used outdoors.
Rope crowd system
Crowd force push/pull 89,925/89,925 lbf
Line pull (effective) 44,965 lbf
Rope diameter 28 mm
Travel 60.7 ft
Line speed 0-230 ft/min
The winches are noted for compact, easily mounted design.
Propulsion is via a maintenance-free planetary gearbox in oil bath.
Load support by the hydraulic system; additional safety factor by
a spring–loaded, multi–disc holding brake. All line pull values are
effective values. The efficiency factor of approx. 25% has already
been deducted.
Engine
Power rating according to ISO 9249, 390 kW (523 hp) at 1900 rpm
Engine type
Liebherr D 856 A7 SCR
Fuel tank 185 gal capacity with continuous level
indicator and reserve warning
Engine complies with NRMM exhaust certification EPA/CARB Tier 4i
or 97/68 EC Stage III B.
Kelly winch with freewheeling
Line pull effective (1 st layer) 56,200 lbf
Rope diameter 34 mm
Line speed 0-259 ft/min
Option:
Line pull effective (1
st layer) 67,445 lbf
Rope diameter 34 mm
Line speed 0-233 ft/min