Liebherr A918 Compact inglese

Macchine Mezzi d’Opera Attrezzature

Casa editrice la fiaccola srl

60 1952 - 2 012

WALK AROUND MACHINE WHEELED EXCAVATOR LIEBHERR A 918 COMPACT LITRONIC

657

Casa editrice la fiaccola - Abstract from magazine COSTRUZIONI - Year LXI March 2012

657

March 2012

Operating weight 17.8 ton (with blade) Operating weight 18.9 ton (with blade and 2-point outriggers) Engine output 110 kW

WALKAROUND ACHINE M BY

CLAUDIO MARINI

WALKAROUNDMACHINE by

A 918COMPACT

LIEBHERR A918 COMPACT

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11

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14

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10 13 4

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THE PLUS BY COSTRUZIONI 1

2

3

Low consumption of the Liebherr 4-cylinder, common rail Stage IIIB engine (4.6 l) External EGR, cooled, with electronic control.

(excellent coupling and quality).

4

The best swing force (50 kNm) and pulling force (117 kN) in its category.

Automatic and safe turret blocking

Powerful electric system with two batteries 135 Ah and alternator 110 A.

5

Components made by Liebherr Electronic components, cylinders, swing ring, hydraulic motor and engine

Sturdy axles (32 ton max load capacity per axle) with multiplate brakes in oilbath in the hub (blocking without clearance).

6

Power shift transmission gear

22 Costruzioni March 2012

7

Blade frames/stabilizers welded for better sturdiness.

8

Advanced hydraulic system, but easy, with Load sensing single pump (lower consumption), combined with a closed-circuit control valve, compensated, to allow simultaneous movements independent on load and rpm.

Ergonomic and safe driving

WALKAROUNDMACHINE by or urea), but availability of DPF for tunnelling works or when required.

PECULIARITIES A “Compact” machine not only on the back but also in the boom reposition, swing capacity 360° in 4.35 m.

B Side-mounted engine (rather than on the back) for better rear compactness, easier access to radiators from both sides, shorter pipes and less distance among hydraulic components, service possible from the ground.

C Cast counterweight to increase its efficiency (specific density and shape).

D Special gear protection inside undercarriage frame.

E Pin connecting the boom to the dipper stick “independent” on the hoist cylinders pins (better stress distribution).

F Compliance with the Stage IIIB regulations with simple DOC-Diesel oxydation catalyst (without regeneration and post injection of diesel oil

Check valves (as standard) in case of damage of equipment pipes, blade and stabilizers.

10 Bullet proof roof glass, the other glasses are stratified.

Consoles suspended together with the seat Air conditioning system with possibility to pre-set the temperature value and the “areas” (head, body, feet).

Practical side mirror.

Noise level 72/100 dBA. Robust pantographsupport of the windshield

P Hydraulic main rolling gate for emergency as well as for on-the-field interventions.

G 7” touchscreen display also for the rear view-camera (digital direct data transfer), with full or partial sight.

A

4,35 M

H Lower windshield partially openable and overlapping to allow the stowage in the under-roof space.

I E

I Likufix, exclusive hydraulic quick coupling with automatic engagement of hydraulic piping and electric connections (tool change from cab).

L L Diesel oil tank with exceptional capacity: 330 l.

M Tiltable radiators, accessible from both sides (easier cleaning). Reversible fan available upon request.

C

N F

M

B

G H

P D

N Automatic pins lubrication system (as standard), protected inside the hood.

O Third step to access the cab removable, with elastic supports.

wiper driven from above for better visibility on excavation operations.

9

Optimal maintenance 11

Advanced diagnostic system with LiDAT Plus satellite data transfer (as standard).

Cab filter accessible from outside.

Air vents protected from droppings on the ground.

Drainages with ecologic valves (with screw safety tap) and magnetic

indicator of ferrous impurities in the tank.

12 Big tool compartment with lock on the left-hand side (additional tool compartment on the right side upon request) 13 Special painting of the counterweight with woody microgranules (better wear resistance and easy retouching).

14 Easy-to-open/close side hood.

March 2012 Costruzioni 23

O

LIEBHERR A918 COMPACT

Intelligent design...

A

B

Side-mounted engine (compact tail, easy access to radiators from both sides, short pipes with more closely spaced hydraulic components, maintenance from the ground).

Booms-lifting independent hinges (reliability and bigger boom rollback, keeping the lifting strength high).

A

Hinge between the boom and the dipper stick 1 “independent” on the lifting cylinders ones 2 allows to distribute the stress on three pins, instead on only one (reliability).

B

1

2 2 The “straddle-mounted” pins further reduce the stress.

24 Costruzioni March 2012

WALKAROUNDMACHINE by

March 2012 Costruzioni 25

LIEBHERR A918 COMPACT

...compact, but stable C D E F

Compact counterweight, but high density cast Swing ring set back Boom-upperstructure hinge set back “Heavy� undercarriage (low center of gravity) protecting the shift transmission gear, with sturdy axles and welded stabilizers frames

C

F

26 Costruzioni March 2012

E

D

1.1 m Setting the swing ring back ( D ) towards the rear axle facilitates front stability, while setting the boom-turret hinge facilitate ( E ) the 360째 stability.

4.35 m

March 2012 Costruzioni 27

LIEBHERR A918 COMPACT

LIEBHERR ENGINE STAGE IIIB SIMPLY WITH EGR AND DOC OXYDATION CATALYST EGR

Engine electronic control unit designed and manufactured

by Liebherr.

The engine crankcase is produced in cooperation with Man.

4 cylinders, 4.6 liter, Common rail, set at 1,800 rpm, with low piston speed (7.5 mps) for less consumption EGR system with EGR functioning: The exhaust gas recirculation, inert at this point, reduces the electronic control peak combustion temperature and limits the Electronically-controlled valve regulating the recirculation of exhaust gases to air intake.

28 Costruzioni March 2012

nitrogen oxyde emission (NOx harmful gas) which is proportional to it.

Advantage of the external EGR, cooled, with electronic control (compared to internal, not cooled, continuous recirculation systems): - less wear of discharge valves (double lifting per cycle is avoided) - minimum rpm stable (gas is not recirculated in cycles characterized by oxygen shortage conditions) - less volume of recirculated gas (since the gas is cooled).

WALKAROUNDMACHINE The DOC is mounted inside the counterweight upper compartment

The engine electronic control unit is mounted on rubber pads (reduced vibrations), detached from the cylinder bank (reduced heat transmission) and cooled by diesel oil circulation.

Diaphragm (internal) which chokes the exhaust gases

The DPF (Diesel Particulate Filter), in the same casing as the DOC provided as standard, and the diesel oil post-injection system are aviialble upon request.

Controlled turbocharger speed.

More reliable turbocharger, better combustion.

A pressure gauge detects eventual pressure peaks in the air pumped by the turbocharger and, by means of levers closing a diaphragm, chokes the exhaust gases which engage it, thus avoiding overspeed at turbines and making combustion uniform.

Levers Pressure gauge

Intake filtered air recirculation

Coalescent filter (series of metal meshes with increasing pattern makes the oil drop size increase until it drops for gravity or centrifugation into the recovery sump).

Less engine oil consumption and no dropping to the ground.

Engine oil recovery into sump

Engine breather

March 2012 Costruzioni 29

LIEBHERR A918 COMPACT

ENGINE MOUNTED AT TURRET SIDE: - access to radiators from both sides - diesel oil tank by 330 liter, (operating autonomy) - less distance between tank, control valve pumps with shorter pipes and less load wastes (less consumption and heating) - easy maintenance from ground

Engine oil filter.

Rare bolt on diesel oil filter which facilitates Main filter and water/diesel oil separator with transparent bottom plate and quick discharge. its release by means of allen wrench.

WALKAROUNDMACHINE by Electronically-controlled speed of the hydostatic fan to reduce noise level and fuel consumption as well as to quickly reach the optimal working temperature

A

“Tiltabile� radiators frame for easy cleaning.

Self-protected by overloads

A

When the engine oil lubricating pressure is very low or the coolant temperature is too high, the engine computer reduces power till the problem has completely disappeared.

The side-mounted engine frees up space on the turret for a capacious tank, 330 l of diesel oil (longer operating autonomy)

Excellent hydraulic design with closely-spaced tank 1 , pump 2 and control valve 3 , shorter pipes (less load waste, less fuel consumption and less oil overheating).

3

2

Diesel oil tank

1 Hydraulic tank Exclusive easy access to radiators from both sides

Ecology drain valve for coolant.

Ecology drain valve for engine oil.

Alternator Polyvee belt automatic tensioning and water pump.

LIEBHERR A918 COMPACT

HEAVY UNDERCARRIAGE (LOW CENTRE OF GRAVITY)

WHICH PROTECTS THE GEARBOX, WITH ROBUST AXLES AND WELDED STABILIZERS FRAMES

Protected gearbox Gearbox is protected by the undercarriage frame

Sturdy axles with 32 ton load capacity each Steering cylinders “high” and protected above the axle

Power shift transmission gear To change speed without having to stop.

Brakes in the wheel hubs To eliminate transmission clearance (in respect to the sole brake on the gear transmission).

“Welded” stabilizers frames and blade (sturdiness)

Cylinders rods protection blade upon request 32 Costruzioni March 2012

WALKAROUNDMACHINE by OIL ON REQUEST WITH NO WASTE AND PRECISE DRIVING The flow is reduced to the minimum with manipulators in neutrum or when machine is not running.

Quick anti-drip couplings for the working tools (as standard)

Load sensing mono-pump

Pump for servocontrols

Attachment and transmission mono-pump

Hydrostatic fan pump

Closed-centre control valve, pressure balanced, for simultaneous movements indipendent on load and rpm

Accumulator for movements facilitated by gravity when engine is off.

Safety valves for boom antifall, blade loosening and stabilizers (as standard)

“Main� rolling gate for emergencies or intervention on the ground

LIEBHERR A918 COMPACT

Full screen rear videocamera

Partial screen rear videocamera

Temperature and zone selection of the automatic air conditioning system (as standard).

Analog indicators.

EXCLUSIVE CAB with 7� display with touchscreen Engine on/off button.

On request: electroproportional control for working tools

Waterproofmembrane push button panel back-lit with LED to be used with gloves.

2-point self-winding safety belt

Adjustable steering wheel

Windshield partially-openable and overlapping Partial opening to ventilate and demist in case of rain.

Overlapping possibility for ...

...storage in the under-roof space

Consoles suspended together with

the seat

Hourly or total consumption indicator

The consoles are suspended together with the seat to avoid vibration transmission to the manipulators. They can be adjusted independently on the seat.

Bullet-proof roof glass (with shutter).

Rain hood and halogen lights as standard.

2nd sun roller blind.

Door with sliding windows.

DETAILS FOR

BETTER COMFORT

Glove compartments Cell phone holder near the 12 Volt socket for recharging

Left console with 12 Volt socket

Several diffusers

Driver’s seat lumbar adjustment

Seat heater as standard

Roof lamp with automatic switching

LIEBHERR A918 COMPACT

POWERFUL AND WELL-DESIGNED ELECTRIC SYSTEM Powerful alternator 110 A and batteries 135 Ah

Excellent care in electrical layouts

Protection heat-shrinking sheath.

Dedicated, sturdy and plastified antifriction support.

Electrical connections IP69 watertight with solvents under pressure

Complete supply of lights with rear LED

WALKAROUNDMACHINE by COMPONENTS QUALITY Liebherr swing ring and gearmotors for high swing torque: 50 kNm

Multiplate brake built-in inside the gearmotor for turret travel blockage without manual pin.

Electronic components designed and manufactured by Liebherr Video-camera with digital signal (instead of analog signal).

Hydraulic cylinders made

by Liebherr, with heads welded to cylinder rods by friction-welding process The friction-welding process of the cylinder heads to the cylinder rods (fusion-welding of the full section instead of the simple ring gearwelding) allows to increase cylinder reliability and to avoid coaxial errors, which may damage sealing gaskets and cause torsions.

March 2012 Costruzioni 37

LIEBHERR A918 COMPACT

DETAILS FOR QUALITY, SAFETY AND...

Third step (to get on easier). Flexible assembling (shock absorbent), removable if necessary.

Special painting with woody microgranules to better resist to scraping and to make partial touches less visible.

“Protected� automatic greasing nipple inside the hatch to avoid acts of vandalism.

Hydraulic filter with practical handle for removal and inside magnetic shaft for immediate detection of ferrous waste.

Side mirror as standard.

Robust hatches made of two-layer DiCycloPentaDiene, rust-proof, heat-resistant and shockproof.

Sound absorbing panels fixed with bosses (not glued only)

Pipes antifriction protections and well-designed layout

WALKAROUNDMACHINE by ...SECOND-HAND VALUE

Muffler out of stainless steel.

No-slip covering of the service pad

Greasing nipples on cab’s door robust hinges.

Additional compartment under the service pad.

Wide compartment for basic tools on the left side and...

...on the right side (upon request).

The engine hood and hatches opening and their “automatic” hold system are facilitated by jacks and self-winding belt.

March 2012 Costruzioni 39

EASY MAINTENANCE

LiDAT satellite data connection (as standard) and GSM data transfer Automatic greasing (as standard)

Greasing times can be programmed from the screen

Storage of ow and pressure data for 10 working tools

40 Costruzioni March 2012

WALKAROUNDMACHINE by LIKUFIX QUICK COUPLING FOR HYDRAULIC WORKING TOOLS Liebherr manufactures full hydraulic quick coupling systems since 1983

Coupling versatility: working tools can be exchanged among models with different piping size Proper springs avoid to force the coupling

Coupling guide

Chip reader (option) Bushing

Safety of coupling - Position sensors The coupling is guaranteed by pin position sensors, instead of the sole coupling pressure - Visual check The coupling with horizontal (not vertical) pin allows the operator to check the side exit of the pin from the driving seat.

- Sequence of three pressure data on the push button panels 1

2

3

Flat-face, non-drip and easy to clean hydraulic couplings

2 Likufix 33 system allows the tool exchange from the A309 model to the A/R 900 one Likufix 48 system allows the tool exchange from the A312 model to the R934 one

1

Coupling duration

Replaceable bushings allow to retrieve the horizontal pin clearance, after many working hours, at low cost (500 €).

Mechanical couplings protected by impacts.

3

Coupling automatism The coupler identifies the working tool, reads the “Chip” which automatically controls the operating parameters and monitors data and features.

Coupling arrangement Electrical contacts integrated in the coupler allow to also transmit to the working tool the electrical functions (3rd circuit).

Universal coupling Liebherr universal plate allows coupling with other brands working tools only making a simple adjustment hole.

March 2012 Costruzioni 41

LIEBHERR A918 COMPACT

DETAILS MAKING MAINTENANCE EASIER

Greasing nipples in easy to access and protected location.

Heads protection plates to avoid wear.

Fuses box in easy to access and protected location.

The cab air filter is located on the cab side and it is accessible from outside. Further on the right, the openable service pad hides a compartment for tools, the battery disconnection devices and the batteries.

Winshield wiper liquid top up point outside the cab.

Fluids drainage with ecologic check valve