Liebherr LTM 1250-6.1 User Manual
Mobile Crane
Product advantages
Max. lifting capacity: 250 t
Max. height under hook: 108 m
Max. radius: 92 m
LTM 1250-6.1
Compact, manoeuvrable
and weight-optimized
• Overall length 17.4 m, carrier 15.3 m long
• Large overhang angles, front up to 17°, rear up to 19°
• Smallest turning radius by 5-axle steering
(13.1 m over carrier)
• Axle load equalization (12 t) due to hydropneumatic
suspension ”Niveaumatik”
• In addition to service and parking brake, the following
sustained-action brakes are part of the standard equipment
for safe travel: retarder in the automatic transmission and
engine brake as exhaust brake with Liebherr auxiliary brake
system by valve control (ZBS)
Variable drive and steering concept
• Standard 5-axle steering, 5th and 6th axle are also steerable
independant from axles 1 – 3. During crab steering/diagonal
displacement, axles 3 and 4 are raised hydraulically
• Drive 12 x 6, axles 1, 5 and 6 are driven
• Drive 12 x 8, axles 1, 4, 5 and 6 are driven, 4th axle activatable
for off-road travel
• Automated gear system ZF-TC-TRONIC with converter and
retarder; 12 forward and 2 reversed speeds, automated
control
• Reduced fuel consumption due to a great number of speeds,
sensitive maneuvering due to converter
• Robust transfer case with transfer differential
• Driving axles with differential locks for transverse locking in
off-road ratio
Setting crane on outriggers –
quick, convenient and safe
• Supporting basis 8.84 m x 8.5 m or 8.84 m x 5.58 m
• Fixed lightweight supporting pads (plastic) with lateral
compensation
• Supporting rams with 600 mm travel
• Level control of supporting system, all-automatic levelling
of the crane during the supporting procedure by “pushbutton control”
• 2 x 9° lateral inclination even with locked suspension
• Inclinometer (electronic inclination indicator) with two displays
on the carrier and one display on the LICCON monitor in
the crane cab
• 2 supporting force indicators on the control panels on the
carrier and on the LICCON monitor
• Operation of the outrigger system in accordance with the
rules for the prevention of accidents
15,29
17.41
2.13
4.0
19°
17°
16.00 R 25 12 t 12 t 12 t 12 t 12 t 12 t
600
8.5
5.58
3.0
6.56
8.86
R=11.40
0.6
R = 6.42
R=13.05
R=14.14
LTM 1250-6.1 LTM 1250-6.1
• 72 m long, 6-section telescopic boom
• Features of the new boom technology:
- optimimized, oviform boom profile – patented internal
interlocking system of the telescopes
- automatic telescopic system “Telematic”
• Telescopic boom with electronically controlled
telescoping system
• Boom bearings of low maintenance polyamide slide blocks
• Outstanding lifting capacities, e.g.
84 t at 10 m radius
38 t at 20 m radius
15.4 t at 40 m radius
8.4 t at 60 m radius
2.1 t at 80 m radius
1.1 t at 92 m radius
• 8-cylinder Liebherr turbo-charged Diesel engine type
D9508 A7, 450 kW/612 h.p., exhaust emissions acc. to
97/68/EG stage 3 and EPA/CARB Tier 3, energy-saving,
robust and reliable, electronic engine management
• Automated gear system ZF-TC-TRONIC with converter and
retarder; 12 forward and 2 reversed speeds, automated
control
• Robust transfer case with transfer differential
• Robust crane axles, welded design
• Max. driving speed 76 km/h, max. gradability 43 %
• Steel-fabricated, corrosion resistant cab, cataphoretic dipprimed, front section on rubber shock absorbers, rear section
on hydraulic dampers, internal sound and heat absorbing
panelling, modern interior design of outstanding functionality
• Safety glass all-round, green-tinted heat-isolating front and
side window panes, electric window lifters
• Standardised digital operating and control elements arranged
in an operator-friendly halfround shape
• Additional heater with engine preheating
• Weight-optimized and low maintenance axles of high-tensile
steel, perfect track-keeping and lateral stability due to special
control linkage arrangement
• The low maintenance steering nuckles are steel and rubber
mounted, thus bearing failures are practically ruled out
• The perfected and robust axles are manufactured in large
series and are part of the trouble-free components of a
mobile crane
• The cardan shafts are maintenance-free. The 70° diagonal
toothing and 4 fixing bolts enable easy and fast fitting of the
cardan shafts
Ultramodern boom technology Powerful carrier drive
Modern and comfortable
driver’s cab
Outstanding carrier technology
for road and off-road operation
• Steel-fabricated and corrosion-resistant crane cab, powdercoated, with internal sound and heat absorbing panelling,
modern interior design, tinted panes all-round, front knockout
window with large windscreen wiper and washer, skylight
of bullet-proof glass with large windscreen wiper and washer,
roller blinds on front window and skylight, space saving
sliding door
• Additional heater
with engine preheating
• Pneumatic operated footboard for safe access to the carrier
• Crane cab tiltable by 20° to the rear
• Crane engine: 4-cylinder Liebherr turbo-charged Diesel
engine type D934L A6 of 180 KW/245 h.p., robust and
reliable,exhaust emissions acc. to 97/68/EG stage 3 and
EPA/CARB Tier 3, electronic engine management, optimized
fuel consumption, exhaust gas system of stainless steel,
very efficient noise abatment of the dieselhydraulic crane
drive
• Slewing rim, slewing gear and the winches are selfmanufactured components specially matched for the
application on mobile cranes
• The centralized lubricating system for slewing rim, boom
bearing application, luffing rams and winch bearings is a
standard feature
Crane cab of modern design Crane drive with
field-proven components
• Maintenance-free suspension rams, free from lateral forces
and protected against damage by synthetic tubes
• Level adjustment (suspension set to “travel mode”) can be
performed automatically from any position by push-button
control
• Stable cornering ability of the crane due to cross mounting
of the hydropneumatic suspension
• Axle locking system (blocking of the suspension for travelling
with equipment) integrated into the suspension rams and
controllable from the driver’s cab
• Carrier, superstructure and telescopic boom in light-gauge
design, calculated by the F.E.M. method, thus weightoptimized and particularly torsonally rigid
• Tensile property of the material with high safety factors
through the application of STE 960 (960 N/mm
2
) for all
supporting members. Telescopic boom bottom shell of ultrahigh tensile steel S 1100 QL (1100 N/mm
2
)
• Weldment joints of oustanding quality are performed by
computer-aided welding machines
• The weld quality is documented by ultrasonic test
Crane- and road-preserving
Niveaumatik suspension
Weight-optimized steel structure
3 412
• Modern and comfortable driver’s cab of outstanding
functionality and convincing design
• Ergonomically arranged operating and display units for safe
and convenient handling at permanent operation
• Digital display and keyboard units interconnected with the
function blocks by data bus technique
• Air-cushioned driver’s and co-driver’s seat with head rests,
driver’s seat with lumber support
• Auxiliary heater with engine preheating
• Safety belts for driver and co-driver
• Height and inclination adjustable steering wheel
• Heated and electrically adjustable rear mirrors
• Side panes with electric window lifters
• 3 automatic windscreen wipers with washing device and
intermittent control
• Delayed disconnection or interior lighting
• Various racks and boxes
• Radio preparation
Comfortable driver’s cab of
outstanding functionality
• Spring-mounted and hydraulically cushioned crane operator’s
seat with pneumatic lumber support and headrest
• Operator-friendly armrest-integrated controls, vertically and
horizontally adjustable master switch consoles and
ergonomically adjustable operating consoles
• Ergonomic control levers with integrated winch rotation and
slewing indicator
• Modern instrument supporting base with integrated LICCON
monitor, display of all essential operating data on the
LICCON screen
• Green-tinted heat-isolating front and side window panes
• Wiper/washer device for front window and skylight
• Auxiliary heater with engine preheating
• Various racks and boxes
• Radio preparation
• 1 working projector 70 Watt on the cabin front
Comfortable crane cab of
outstanding functionality
LTM 1250-6.1 LTM 1250-6.1 LTM 1250-6.1
• Modern and comfortable driver’s cab of outstanding
functionality and convincing design
• Ergonomically arranged operating and display units for safe
and convenient handling at permanent operation
• Digital display and keyboard units interconnected with the
function blocks by data bus technique
• Air-cushioned driver’s and co-driver’s seat with head rests,
driver’s seat with lumber support
• Auxiliary heater with engine preheating
• Safety belts for driver and co-driver
• Height and inclination adjustable steering wheel
• Heated and electrically adjustable rear mirrors
• Side panes with electric window lifters
• 3 automatic windscreen wipers with washing device and
intermittent control
• Delayed disconnection or interior lighting
• Various racks and boxes
• Radio preparation
Comfortable driver’s cab of
outstanding functionality
• Spring-mounted and hydraulically cushioned crane operator’s
seat with pneumatic lumber support and headrest
• Operator-friendly armrest-integrated controls, vertically and
horizontally adjustable master switch consoles and
ergonomically adjustable operating consoles
• Ergonomic control levers with integrated winch rotation and
slewing indicator
• Modern instrument supporting base with integrated LICCON
monitor, display of all essential operating data on the
LICCON screen
• Green-tinted heat-isolating front and side window panes
• Wiper/washer device for front window and skylight
• Auxiliary heater with engine preheating
• Various racks and boxes
• Radio preparation
• 1 working projector 70 Watt on the cabin front
Comfortable crane cab of
outstanding functionality
• The electric and electronic components are interconnected
by the latest data bus transmission technique
• Instead of the traditional electric wiring, the data transmission
to the individual function blocks is performed digitally just
by a few data cables, thus improved reliability due to
essentially less contacts
• Self-manufactured Liebherr bus systems (LSB), specially
adapted to the requirements of a mobile crane
• Diesel engine and automatic transmission are controlled by
a CAN data bus. The all electronic drive management reduces
fuel consumption and improves the exhaust gas emission
• The electric systems of the carrier and crane as well as of
all cockpit functions, the outrigger system and sensor system
of the boom are interconnected by 4 Liebherr system busses
• The control of the function blocks is realized by I/A modules
the programming of which is performed by means of the
Liebherr system busses. The control intelligence is integrated
into the LICCON central unit
• Comprehensive diagnostic facilities, quick error localization,
operating error display
• Test programs for functional test of keyboard and display
unit as well as for the test of the control units for engine and
transmission management, additional Liebherr brake system,
hydraulic ventilator, hydraulic suspension and outrigger
control panels
• The new data bus technique distinctively increases
functionality and efficiency of the mobile crane
2a
1a
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