Technical data, Engine, Hydraulic system – Liebherr R 956 User Manual

Page 16: Hydraulic controls, Swing drive, Operator’s cab

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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)

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