Version with electric motor, Electric system, Electric motor – Liebherr R 944 C Litronic High Rise User Manual
Page 3: Hydraulic system, Hydraulic controls, Swing drive, Operator’s cab, Undercarriage, Attachment
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R 944 C Litronic High Rise
3
Version with Electric Motor
Electric System
The 400 V electrical cabinet provides a degree of protection to IP55.
This houses the following components:
– Main motorised isolator, controlled from the cab
– Star/delta starter for motor
– Outlets for supplying auxiliary elements: heating, climate control
– Various heat protection devices
– Resistors for controlling the temperature of the cabinet
– Booster pump integrated in the cabinet: Cabinet air filtered (option)
– Transformers – rectifier for 24 V control circuit
– Motor protection attachment
– Auxiliary batteries: 2 x 135 Ah/12 V: secured functions: lighting for excavator/
attachment position (option)
Electric Motor
Motor
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asynchronous three-phase, cage rotor enclosed
in cast iron envelope, special Liebherr design
Power rating
(as per CEI 34-1)
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200 kW (272 HP) at 1,485 RPM
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
painting: RAL 7031
Standard degree of protection
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IP55 – steel flange FF600
Insulation
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class F, thermal loading: Class B,
ambient temperature 40 °C
Starter star/delta
Heat protection for windings
Heat protection for bearings
Anti-condensation heating system resistors
Hydraulic System
Hydraulic pump
for attachment and
travel drive
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two Liebherr variable flow, swash plate pumps
Max. flow
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2 x 305 l/min.
Max. pressure
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350 bar
Pump regulation
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electro-hydraulic with electronic engine speed
sensing regulation, pressure compensation, auto-
matic oil flow optimizer
Hydraulic pump
for swing drive
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reversible, variable flow, swash plate pump,
closed-loop circuit
Max. flow
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205 l/min.
Max. pressure
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370 bar
Hydraulic tank
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460 l
Hydraulic system
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710 l
Hydraulic oil filter
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2 full flow filters in return line with inte grated fine
filter area (5 µm)
Hydraulic oil cooler
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radiator equipped with hydrostatic drive fan for
cooling the hydraulic oil and climate control
condenser
Liebherr Tool Control
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ten preadjustable pump flows and pressures for
add on tools (option)
Hydraulic Controls
Power distribution
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via monoblock control valve with integrated
safety valves
Flow summation
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to boom and stick
Closed-loop circuit
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for uppercarriage swing drive
Servo circuit
Attachment and swing
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proportional via joystick levers
Travel
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– proportional via foot pedals or removable hand
levers
– speed pre-selection
Additional functions
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via foot pedals or joystick toggle switch
Swing Drive
Drive by
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Liebherr hydraulic 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
Swing speed
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0 – 7.9 RPM stepless
Swing torque
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119 kNm
Holding brake
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wet multi-disc (spring applied, pressure released)
Option
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pedal controlled positioning brake
Operator’s Cab
Cab
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built from deep drawn components, resil iently
mounted, sound insulated, tinted windows, front
window stores overhead, door with sliding
window
Operator’s seat
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shock absorbing suspension, adjustable to
operator’s weight, 6-way adjustable seat
Joysticks
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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,
warning (audible and visual signal) and saving
of machine malfunction data, such as overheating
of windings, motor bearings, or low hydraulic oil
level
Heating system
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standard air conditioning, combined cooler/
heater, additional dust filter in fresh air/recircu-
lated
Undercarriage
Version HR
Drive
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Liebherr hydraulic motor with integrated brake
valves on both sides
Transmission
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Liebherr planetary reduction gears
Travel speed
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low range – 3.0 km/h
high range – 3.8 km/h
Drawbar pull max.
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320 kN
Track components
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D 7 G, maintenance-free
Track rollers/Carrier rollers
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13/3
Tracks
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sealed and greased
Track pads
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flat pad
Digging locks
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wet multi-discs (spring applied, pressure
released)
Brake valves
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integrated into travel motor
Attachment
Type
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high-strength steel plates at highly-stressed
points for the toughest requirements. Complex
and stable mountings of attachment and cylin-
ders. Unrivalled strength, even at high loads
Hydraulic cylinders
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Liebherr cylinders with special seal system.
Shock absorption
Pivots
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sealed, low maintenance
Lubrication
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Liebherr semi-automatic central lubrication
system
VarioLiftPlus
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variable boom mounting positions for optimized
lift capacities
* Other voltages and frequencies possible on request.