Liebherr LRB 255 - Manual (Page 5)

Engine
Water–cooled, V 8 cylinder Liebherr diesel engine, model D 9408 TI–E,
turbocharged with intercooler, power rating according to ISO 9249,
536 HP at 1900 rpm.
Option:
Water–cooled, V 12 cylinder Daimler Chrysler diesel engine, model
LOM 444 LA, turbocharged with intercooler, power rating according to
ISO 3046 IFN, 811 HP at 1900 rpm.
The automatic limiting load control adapts perfectly the power of the main
users to the present engine speed.
Fuel tank: 214 gal capacity with continuous level indicator and reserve
warning.
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.
Pump for working tools: 2x 79 gal/min and 1x 106 gal/min
Separate pump for kinematics: 18 gal/min
Separate pump for crowd system: 82 gal/min
Hydraulic oil tank: 264 gal
Max. working pressure: 4978 PSI
No auxiliary power packs are required as application specific hydraulics
supply power to all components.
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.
Rope Crowd System
Crowd force push/pull: 101,200/101,200 lbf
Line pull (nominal load): 33,700 lbf
Rope diameter: 24 mm
Max. line speed: 0–285 ft/min
Swing
Consists of single row ballbearing, fixed axial piston hydraulic motor, spring
loaded and hydraulically released multi–disc holding brake, planetary
gearbox and pinion.
Free swing with hydraulic moment control reduces wear to a minimum,
because rotation moment is sustained through the hydraulic system by the
diesel engine.
Swing speed from 0 – 4.5 rpm is continuously variable.
Crawlers
Propulsion through axial piston motor, hydraulically released spring loaded
multi–disc brake, maintenance free crawler tracks, hydraulic chain tension-
ing device.
Telescopic undercarriage: 0 – 0.9 mph
3–web track shoes: (optional 35.4 inch) 31.5 inch
Track force: 141,630 lbf
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.
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
crane is equipped with proportional control for all movements, which can be
carried out simultaneously.
The “Redundant” control system allows restricted operation of the machine
in the event of a failure on the electronic base control or its sensors.
Two joysticks are required for operation. Pedal control can be changed to
hand control.
Options :
D PDE : Process data recording
D GSM modem
Noise emission
Noise emissions correspond with 2000/14/EC directive on noise emission
by equipment used outdoors.
Technical description
Auxiliary winch
Line pull (nominal load): 18,000 lbf
Rope diameter: 20 mm
Drum diameter: 12.6 inch
Max. line speed: 0–197 ft/min
The winches are noted for their 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.
LRB 255 5