Liebherr LRB 255 User Manual
Technical data
Piling and drilling rig
LRB 255
Concept and characteristics
Leader top for auxiliary rope
Tool with quick connection
Leader
Leader support arm
Vertical travel device
Rope crowd system
Auxiliary winch
Lateral inclination device
Longitudinal inclination device
Support arm brace
Leader rotation device
Undercarriage
• High engine output with automatic engine speed
control
• Controlled entirely from cab
• Sturdy and solid rig design
• Wide longitudinal and lateral supporting system on
the basic machine through triangles
• High push and pull forces
• High torque
• Completely self–rigging (no auxiliary machines
required)
• Large range of working tools (all piling and drilling
works can be performed)
• Stepless leader inclination 1:6 forward – 1:3 backward
depending on type of equipment
Radius adjustment device
Uppercarriage
• Leader swing range ± 90º
• Increase of effective leader length (3 m) via vertical
travel device
• Automatic vertical alignment
• High alignment forces
• Simultaneous control of several movements via
Load–sensing multi–circuit hydraulics
• Quick change of equipment possible through quick
connection
• Equipment design according to latest European
regulations and standards
• High manufacturing quality through quality control by
PDE–system
2 LRB 255
Transport dimensions and weights
7725
22085
5890
8470
900
3200
400
3950
1245
3490
Transport with leader
includes the basic machine (ready for operation) with leader,
without working tools (such as rotary, Kelly bar etc.) and without
counterweight.
22085
Transport leader
includes the leader without working tools
(such as rotary, Kelly bar etc.).
7150
3200
Dimensions and weights
Leader length 21.2 m 24.2 m 27.2 m 30.2 m
Weight complete
without counterweight*
68.3 t 69.4 t 70.6 t 71.8 t
2850
1670
Dimensions and weights
Leader length 21.2 m 24.2 m 27.2 m 30.2 m
Weight
27.3 t 28.4 t 29.6 t 30.8 t
1245
900
1690
5890
3490
Transport basic machine
ready for operation
Basic machine*
*) Weights can vary with the nal con guration of the machine.
400
41 t
3300
3070
800
Weights
Counterweight 12.5 t
1370
LRB 255 3
Dimensions
Basic machine LRB 255
1:6
21200 (24000) [27200] {30200}
5700
1:3
800
4000 4230
900
2.8°
2.8°
4700
90°
90°
Technical data
Leader length 21/24/27/30 m
Capacity hammer including cap plus pile
Max. hammer weight 15 t
Max. pile weight 15 t
Max. pull, leader on ground 450 kN
Max. torque 300 kNm
Working radius machine
center of rotation — front edge leader
Stepless rig inclination adjustment
Lateral inclination
Forward inclination 1:6
Backward inclination 1:3
Vertical leader adjustment
above ground level (depending on radius)
below ground level (depending on leader length) 5 m
Leader swing range ± 90°
30 t
3.2 — 4.9 m
± 1:20
3 m
R 4200
Operating weight and ground
pressure
Total weight with 900 mm 3–web shoes 80.8 t
Ground bearing pressure 0.91 kg/cm
The operating weight includes the basic machine LRB 255 (leader
length 21.2 m, without working tools) and 12.5 t counter weight.
2
4 LRB 255
Technical data
Engine
Power rating according to ISO 3046, 670 kW (898 hp) at 1900 rpm
Engine type MAN D 2842 LE
Fuel tank 795 l capacity with continuous level
indicator and reserve warning
Engine complies with NRMM exhaust certication EPA/CARB Tier 2.
Hydraulic system
The main pumps are operated by a distributor gearbox. A xial piston
displacement pumps work in open circuits supplying oil only when
needed (ow 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 400 l/min and 1x 350 l/min
Separate pump for kinematics 129 l/min
Separate pump for crowd system 300 l/min
Hydraulic oil tank 1000 l
Max. working pressure 350 bar
No auxiliary power packs are required as application specic
hydraulics supply power to all components.
The cleaning of the hydraulic oils occurs via an electronically
monitored pressure and return lter.
Any clogging is shown on the display in the cab.
The use of synthetic environmentally friendly oil is also possible.
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 modem allows for remote inquiry of machine
data and error indications. 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.
Options :
PDE : Process data recording
Main winch with freefall
Line pull (effective) 200 kN
Rope diameter 30 mm
Line speed 0 - 89 m/min
Auxiliary winch
Line pull (effective) 80 kN
Rope diameter 20 mm
Drum diameter 320 mm
Line speed 0 - 48 m/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 – 1.5 km/h
Track force 622 kN
Width of 3-web track shoes 900 mm
Swing
Consists of triple-row roller bearing with external teeth and two
swing drives, xed 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 – 4.5 rpm is continuously variable.
Rope crowd system
Crowd force push/pull 450/450 kN
Line pull (effective) 150 kN
Rope diameter 24 mm
Line speed 0 - 87 m/min
The winches are noted for compact, easily mounted design.
Propulsion is via a maintenance-free planetar y 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 efciency factor of approx. 25% has already
been deducted.
Noise emission
Noise emissions correspond with 2000/14/EC directive on noise
emission by equipment used outdoors.
LRB 255 5
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