Technical data, Attachment, Electric motor – Liebherr ER 944 C High Rise User Manual
Page 7: Electric system, Hydraulic system, Hydraulic controls, Swing drive, Operator’s cab, Undercarriage
ER 934 C ER 944 C ER 954 C High Rise
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Technical Data
Attachment
Type
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high-strength steel for extreme stresses. Bearings
designed for optimum distribution of stresses
Hydraulic cylinders
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Liebherr cylinders with end-of-travel shock
absorbing, fitted with guide and sealing joints
Pivots
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sealed, low maintenance
Lubrication
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centralised semi-automatic Liebherr lubrication
system
VarioLift
Plus
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variable boom mounting positions for optimized
lift capacities
Electric Motor
Engine
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induction motor dedicated definition Liebherr
934
944
954
Power rating
(as per CEI 34-1)
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160 kW (218 HP) 200 kW (272 HP) 250 kW (340 HP)
Rated voltage
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400 V – 50 Hz *
Number of poles
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4
Design type
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horizontal axle B35
axle height 315 mm
Standard degree of protection
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IP55
Insulation
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class F
Cooling
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IC06
Heat protection for windings
Heat protection for bearings
Anti-condensation heating system resistors
Electric System
The 400 V electrical cabinet provides a degree of protection to IP55.
This houses the following components:
– Electrical cabinet – remote control inside the cab
– Star/delta starter for motor
– Outlets for supplying auxiliary elements: heating, climate control
– Overheat protection devices
– Integrated heating and ventilation
– Filtered booster
– Transformers – rectifier for 24 V control circuit
– Motor protection
– Auxiliary batteries: 2 x 135 Ah/12 V: secured functions: lighting for excavator/
attachment position (option)
– Connecting inside closed panel
– Equipment: slip ring collector
power connector
embedded cable reel
Hydraulic System
934
944
954
Hydraulic pump
for the attachment
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two Liebherr swash plate pumps with variable
output
Max. flow
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2 x 253 l/min.
2 x 305 l/min.
2 x 341 l/min.
Max. pressure
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350 bar
Pumpenansteuerung
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electro-hydraulic, with electronic regulation by
power limit, minimum pump flow at max. pres-
sure, distribution of oil to different receptor
components proportional to demand
Hydraulic pump
for the swing drive
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reversible swash plate pump, in closed circuit
Max. flow
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170 l/min.
205 l/min.
205 l/min.
Max. pressure
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370 bar
Hydraulic tank
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340 l
460 l
440 l
Hydraulic system
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550 l
710 l
790 l
Filtration
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934: filter in the return circuit, with integrated fine
filter elements (5 μm)
944/954: 2 filters in the return circuit, with inte-
grated fine filter elements (5 μm)
Cooling
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radiator equipped with hydrostatic drive fan for
cooling the hydraulic oil and climate control
condenser
Tool Control
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10 flow rates and pressures adjustable as option
for optional accessories
Hydraulic Controls
Power distribution
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with the aid of hydraulic distributors with
integrated safety valves
Flow summation
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to boom stick and stick
Closed-loop circuit
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for uppercarriage swing drive mechanism
Control
Attachment and swing
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proportional by handling element in cross
operation
Travel
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proportional by pedals or by lever
Additional functions
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proportional by pedals or by toggle switch
* Other voltages and frequencies possible on request.
Swing Drive
Drive by
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hydraulic swash plate motor with integrated
brake valves
Transmission
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Liebherr compact planetary reduction gear
Swing ring
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Liebherr, sealed single race ball bearing swing
ring, internal teeth
934
944
954
Swing speed
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0 – 9.4 RPM
0 – 7.9 RPM
0 – 5.6 RPM
stepless
stepless
stepless
Swing torque
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81.07 kNm
119 kNm
167.23 kNm
Holding brake
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oil-bath disk brake (negative action)
Option
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pedal controlled positioning brake
Operator’s Cab
Cab
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single shell concept with shaped profiles, resil-
iently mounted, sound insulated, tinted windows.
Front window can be folded away under roof,
door with sliding window
Operator’s seat
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shock absorbing suspension, adjustable to
operator’s weight, 6-way adjustable seat
Controls
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integrated into adjustable seat consoles
Monitoring
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menu driven digital display of current operating
conditions. Automatic monitoring, display, warn-
ing (audible and visual signal) and saving of
machine malfunction data, such as overheating
of windings, motor bearings, or low hydraulic
oil level
Climate control
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standard climate control system, combined
cooler/heater, additional dust filter in the outside/
fresh air circuit
Noise emission
2000/14/EC
934
944
954
L
WA
(surround noise)
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101 dB(A)
103 dB(A)
105 dB(A)
Undercarriage
Version HR
Drive
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Liebherr swash plate motors with integrated
brake valves on both sides
Transmission
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Liebherr planetary reduction gears
934
944
954
Travel speed
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2.6 km/h
2.6 km/h
2.5 km/h
Drawbar pull max.
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318 kN
363 kN
397 kN
Track components
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maintenance-
maintenance-
maintenance-
free
free
free
B 60
D 7 G
D 8 K
Track rollers/Carrier rollers
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9/2
13/3
13/3
Tracks
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sealed and greased
Track pads
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triple grouser
Digging locks
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wet multi-discs (spring applied, pressure
released)
Brake valves
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integrated into travel motor