Technical data, Engine, Hydraulic system – Liebherr R 9250 User Manual
Page 16: Electro-hydraulic controls, Electric system, Electric motor (optional), Swing drive, Uppercarriage

16
R 9250
Technical Data
Engine
1 Cummins diesel engine
Rating per
SAE J 1995
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960 kW/1,287 HP at 1,800 rpm
Model
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Cummins QSK45
(USA/EPA Tier 1)
Type
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12 cylinder turbocharged V-engine
after-cooler
two separate water cooling circuits
direct injection system
Displacement
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45 l/2,745 in
3
Bore/Stroke
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159/190 mm / 6.26/7.48 in
or
1 Cummins diesel engine
Rating per
SAE J 1995
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940 kW/1,261 HP at 1,800 rpm
Model
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Cummins QSK38
(USA/EPA Tier 2 or fuel consumption
optimized setting)
Type
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12 cylinder turbocharged V-engine
after-cooler
two separate water cooling circuits
direct injection system
Displacement
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37,8 l/2,307 in
3
Bore/Stroke
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159/159 mm / 6.26/6.26 in
Engine cooling system
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fans driven via hydraulic piston motor
Air cleaner
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dry-type air cleaner with pre-cleaner,
with automatic dust ejector, primary
and safety elements
Fuel tank
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5.440 l/1,434 gal
Electrical system
Voltage
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24 V
Batteries
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6 x 170 Ah/12 V
Alternator
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24 V/260 Amp
Engine idling
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automatic engine idling
Electronic engine
control system
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engine speed sensing over the entire
engine RPM range. Provides integration
of engine with other machine systems
Hydraulic System
Hydraulic pumps
for attachment and
travel drive
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3 variable flow axial piston pumps
Max. flow
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2 x 771 l/min. + 1 x 579 l/min./
2 x 204 gpm + 1 x 153 gpm
Max. hydr. pressure
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320 bar/4,640 psi
Hydraulic pump
for swing drive
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2 reversible swash plate pumps,
closed-loop circuit
Max. flow
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2 x 352 l/min. / 2 x 93 gpm
Max. hydr. pressure
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350 bar/5,076 psi
Pump management
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electronically controlled pressure and flow
management with oil flow optimisation
Hydraulic tank capacity
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2.281 l/602 gal
Hydraulic system
capacity
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4.050 l/1,070 gal
Hydraulic oil filter
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1 high pressure safety filter after each high
pressure pump + fine filtration of entire
return flow (15/5 μm)
Hydraulic oil cooler
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cooler with temperature controlled fans
driven via hydraulic piston motor
Electro-Hydraulic Controls
Servo circuit
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independent, electric over hydraulic
proportional controls of each function
Emergency control
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via accumulator for all attachment
functions with stopped engine
Power distribution
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via monoblock control valves with inte-
grated primary relief valves and flanged
on secondary valves for travel
Flow summation
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to attachment and travel drive
Control functions
Attachment and
swing
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proportional via joystick levers
Travel
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proportional via foot pedals or hand levers
Bottom dump bucket
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proportional via foot pedals
Electric System
Electric isolation
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easy accessible battery isolations
Working lights
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high brightness halogen lights:
– 2 on working attachment
– 1 on RHS of uppercarriage
– 3 on LHS of uppercarriage
– 2 on counterweight
Xenon or LED lights in option
Emergency stop switches
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at ground level, in hydraulic compartment,
in engine compartment and in operator cab
Electrical wiring
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heavy duty execution in IP 65 standard for
operating conditions of – 50 °C to 100 °C/
– 58 °F to 212 °F
Electric Motor (optional)
1 electric motor
Power output
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1.050 kW/1,408 HP
Type
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3 phase AC squirrel cage motor
Voltage
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6,000 V, other voltage on request
Frequency
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50 Hz (or 60 Hz)
Revolutions
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1,500 rpm or 1,800 rpm
Motor cooling
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integrated air-to-air heat exchanger
Starting method
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inrush current limited to 2,2 full load current
Swing Drive
Hydraulic motor
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2 Liebherr axial piston motors
Swing gear
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2 Liebherr planetary reduction gears
Swing ring
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Liebherr, sealed triple roller swing ring,
internal teeth
Swing speed
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0 – 4.4 rpm
Swing-holding brake
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hydraulically actuated, maintenance-free,
multi-disc brakes integrated in each swing
gear
Uppercarriage
Design
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torque resistant designed upper frame in
box type construction for superior strength
and durability
Attachment mounting
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parallel longitudinal main girders in box-
section construction
Machine access
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(Tier 1) hydraulically driven access ladder
on the cab side of the uppercarriage,
(Tier 2) 45° access system with handrails
on the cab side of the uppercarriage, full
controlled descent in case of emergency
stop
additional emergency ladder fitted near the
cab