Technical data, Engine, Hydraulic system – Liebherr R 926 User Manual
Page 14: Hydraulic controls, Swing drive, Operator’s cab, Undercarriage, Attachment
14
R 926 Litronic
Technical Data
Engine
Rating per ISO 9249
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129 kW (175 HP) at 1,800 RPM
Model
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Liebherr D 934 A7
Type
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4 cylinder in-line
Bore/Stroke
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122/150 mm
Displacement
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7.0 l
Engine operation
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4-stroke diesel
Common-Rail, bi-turbo
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, primary and
safety elements
Fuel tank
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444 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 utili-
sation of the service that is available
Hydraulic System
Hydraulic system
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Positive Control. Dual circuit hydraulic system for
independent and need-based quantity allotment
via the hydraulic pumps; sensor-guided. Features
high system dynamics and sensibility provided by
integrated system controlling
Hydraulic pump
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Liebherr variable displacement pump built in
transversal plate style, in parallel arrangement
with integrated transfer box
Max. flow
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2 x 238 l/min.
Max. pressure
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380 bar
Pump management
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electronic pump management via the integrated
system controlling (CAN-BUS) synchronous to
the control block
Hydraulic tank
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287 l
Hydraulic system
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max. 360 l
Hydraulic oil filter
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1 full flow filter (10 μm)
Hydraulic oil cooler
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compact cooler, consisting of a water cooler,
sandwiched with hydraulic oil cooler, gearbox oil
cooler, fuel cooler and after-cooler cores and
hydrostatically driven fan
MODE selection
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adjustment of engine and hydraulic performance
via a mode pre-selector to match application, e.g.
for especially economical and environmentally
friendly operation or for maximum digging per-
formance 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 pressures for
add-on tools
Hydraulic Controls
The controlling is conducted via the integrated excavator system technology,
input and output modules, communicated via the CAN-BUS with the electronic
central unit.
Power distribution
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via control valve with integrated safety valves
Servo circuit
Attachment and swing
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proportional via joystick levers
Travel
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– with proportionally functioning foot pedals and
adjusted with a plugable lever
– speed pre-selection
Additional functions
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proportional regulation via slide switches or foot
pedals
Swing Drive
Drive by
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Liebherr swash plate motor, shockless and anti-
reaction
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 – 11 RPM stepless
Swing torque
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79 kNm
Holding brake
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wet multi-disc (spring applied, pressure released)
Operator’s Cab
Cab
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ROPS safety cab structure with individual wind-
screens 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 possi-
bilities, shock-absorbing suspension, sound-
damping insulating, tinted laminated safety glass,
separate window shades for the sunroof window
and windscreen, 12 V plug, storage bins, lunch-
box, cup holder
Operator’s seat
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Comfort seat, airsprung with automatic weight
adjustment, vertical and horizontal seat damping
including consoles and joysticks. Seat and arm-
rests 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 self-
explanatory operation via touch screen, video,
versatile adjusting, control and monitoring facili-
ties, e.g. climate control, implement and tool
parameters
Air-conditioning
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standard automatic air-conditioning, ambient 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 out-
side 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) = 103 dB(A)
Undercarriage
Versions
NLC
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gauge 2,000 mm
SLC
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gauge 2,250 mm
LC
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standard gauge 2,380 mm
WLC
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gauge 2,590 mm
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
Travel speed
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low range – 3.7 km/h
high range – 6.1 km/h
Net drawbar pull on crawler
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226 kN
Track components
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B 60, maintenance-free
Track rollers/Carrier rollers
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9/2
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
Lashing eyes
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integrated
Attachment
Type
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combination of resistant steel plates and cast
steels components
Hydraulic cylinders
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Liebherr cylinders with special seal-system,
shock protection
Pivots
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sealed, low maintenance
Lubrication
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automatic central lubrication system (except link
and tilt geometry)
Hydraulic connections
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pipes and hoses equipped with SAE splitflange
connections
Bucket
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fitted as standard with Liebherr tooth system