Technical data, Engine, Hydraulic system – Liebherr R 956 User Manual
Page 16: Hydraulic controls, Swing drive, Operator’s cab

16
R 956 Litronic
Technical Data
Engine
Rating per ISO 9249
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240 kW (326 HP) at 1,800 RPM
Model
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Liebherr D 936 A7
Type
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6 cylinder in-line
Bore/Stroke
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122/150 mm
Displacement
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10.52 l
Engine operation
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4-stroke diesel
Common-Rail, bi-turbo
exhaust-gas recirculation (eagr)
Exhaust gas treatment
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particle filter with active regeneration
emission standard stage IIIB / Tier 4i
Cooling
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water-cooled and integrated motor oil
cooler, after-cooled and fuel cooled
Air cleaner
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dry-type air cleaner with pre-cleaner, pri-
mary and safety elements
Fuel tank
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800 l
Electrical system
Voltage
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24 V
Batteries
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2 x 180 Ah/12 V
Starter
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24 V/7.8 kW
Alternator
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three phase current 28 V/100 A
Engine idling
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sensor-controlled
Motor management
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connection to the integrated excavator
system controlling via CAN-BUS to the
economical utilisation of the service that
is available
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 350 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 com-
pensation, flow compensation, automatic
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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211 l/min.
Max. pressure
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355 bar
Hydraulic tank
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380 l
Hydraulic system
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670 l
Hydraulic oil filter
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2 full flow filters in return line with integrated
fine filter area (5 µm)
Hydraulic oil cooler
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compact cooler for water cooler, after-
cooler, fuel cooler and transmission pump
oil, sandwiched with cooler for oil and
condenser of air-conditioning with hydro-
statically controlled fan drives
MODE selection
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adjustment of engine and hydraulic perfor-
mance via a mode pre-selector to match
application for especially economical and
environmentally friendly operation or for
maximum digging performance and heavy-
duty jobs
RPM adjustment
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stepless adjustment of engine output via
RPM at each selected mode
Tool Control
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10 preadjustable pump flows and pres-
sures for add-on tools
Hydraulic Controls
The controlling is conducted via the integrated excavator system tech-
nology, input and output modules, communicated via the CAN-BUS
with the electronic central unit.
Power distribution
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via control valves in single block with inte-
grated 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 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
Swing speed
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0 – 6.1 RPM stepless
Swing torque
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165 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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ROPS safety cab structure (capable of
sweeping over) with individual windscreens
or featuring a slide-in subpart under the
ceiling, work headlights integrated in the
ceiling, a door with a side window (can be
opened on both sides), large stowing and
depositing possibilities, shock-absorbing
suspension, sounddamping insulating,
tinted laminated safety glass, separate
window shades for the sunroof window
and windscreen, 12 V plug, storage bins,
lunchbox, cup holder
Operator’s seat
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Liebherr-Comfort seat, airsprung with auto-
matic weight adjustment, vertical and hori-
zontal seat damping including consoles
and joysticks. Seat and armrests adjustable
separately and in combination, seat heating
as standard
Control system
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arm consoles, swinging with the seat
Operation and displays
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large high resolution colour display with
selfexplanatory operation via touch screen,
video, versatile adjusting, control and
monitoring facilities, e.g. climate control,
implement and tool parameters
Air-conditioning
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standard automatic air-conditioning, ambi-
ent air function, fast de-icing and demisting
at the press of a button, air vents can be
operated via a menu; ambient air and fresh
air filters can be easily replaced and are
accessible from the outside; heating-
cooling unit, designed for extreme outside
temperatures, sensors for solar radiation,
inside and outside temperatures
Noise emission
ISO 6396
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L
pA
(inside cab)
= 72 dB(A)
2000/14/EC
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L
WA
(surround noise) = 106 dB(A)