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Experience the Progress

Liebherr Crawler Tractor PR744

Liebherr Crawler Dozer PR 744

Applications

Content

Comparisons Operator Requirements

Technical Data Customer Requirements

Positioning

Applications

Content

Positioning

PR 744 – Design Parameters

Engine output: 184kW / 250HP

Operating weight: 24.6 – 31.6 t

Blade capacity*: 7,20 m³

Hydrostatic travel drive

* Semi U-blade

Technical data

Applications

Content

Comparisons Driver Requirements

Positioning

Application

Highway construction - Spain

Earth moving - Spain

Application

Material depositing - Germany

Land Clearing - Spain

Application

Earth moving - Spain

Application

Land Clearing - Tanzania

Application

Cleaning around bucked-wheel-excavator – Czech Republic

Application

Creating skiing slopes – North Italy

Application

Stripping top soil - Austria

Road Construction - Algeria

Application

Earth moving - Algeria

Application

Waste handling

Application

Waste handling - Canada

Application

Road Construction - USA

Applications

Content

Positioning

Buyers requirements

High performance

High reliability

Low fuel consumption

Low service expenses

Low wear expenses

Versatility

High performance

Liebherr Turbo Diesel Engine

Liebherr Diesel Engine

Engine type D 936-L A6 (Tier III)

Design 6-cylinder turbo inline engine

Cooling system Intercooler / water cooler

Engine output 184 kW

Rated speed 1.600 rpm

Displacement 10,5 Liter

High performance

Principle of the Liebherr Power Train

High performance

Power train – PR 744

Final drive with

sprocket

Hydraulic hoses

Hydraulic motor(s)

Left travel pump

High performance

Scheme of the hydrostatic system

Low pressure

Hydrostatic motor Hydrostatic pump

High pressure Swivel plate

Stroke

Output

Swivel plate

Stroke

High performance

The Liebherr Hydrostatic Travel Drive

High performance

Single

Joystick

Control

High performance

Ripping comparison => Hydrostatic Drive vs. Torque Converter

Optimum blade contour for excellent material flow

High performance

High reliability

Two separate cooling systems on Liebherr large size dozers

Hydraulic

oil cooler Engine cooler

High reliability

Scheme of the suctioning hydrostatic fan

High reliability

Advantages of the Liebherr cooling system

Suctioning fan

As the air flow is directed straight to the cooler, small

particles, such as sand do not cause any wear

With the suctioning fan, the „Hub hole“ in the centre of

the cooler is used so that the cooling performance is

considerably increased

Fan with reversible rotation direction (option)

The rotation of the fan reverses automatically each 30

minutes.

This feature is recommended for applications such landfill

and stockpiling coal and woodchips (dusty applications)

High reliability

Advantages of Liebherr Cooling System

Radiator with big fin gaps

Less wear (also in sand applications)

Reduced blocking of radiator vents

due to the high fin distances

Hydrostatic driven fans

Constant engine and oil temperature

In case of maximum engine power the

hydrostatic fan remains at maximum

Quick warm up of the diesel engine

Less noise level

High reliability

Proved and tested components

Stress testing (main frame see pic)

Vibration testing (radiator see pic)

Double sealing on final drives

Long time tests of components

Box section chassis design

Wear protection cable harness

Vibration testing

Durability testing

ROPS testing

Durability test of travel drive

Constant engine speed keeps fuel

consumption low

Low engine speed (1.600 rpm)

provides best combustion

The engine nominal speed is in

the region of the loweset specific

fuel consumption – maximum

operating economy is assured

Easy service access

1) Air intake

2) Automatic dust ejection

3) Air filter with safety cartridge

4) Intercooler

5) Engine/cylinders

6) Exhaust manifold

7) Engine control

8) Water separator and diesel fuel

filter

9) Diesel fuel fine-mesh filter

10) Engine oil filter

7) 8) 9)

Quick and simple maintenance

Easy access to all engine parts

Easy access to all maintenance parts

Few lubrication points

a) Bearings on the lift cylinders

b) Bearings on the ripper lift and tilt cylinders

c) Bearings on the oscillating bar

Easy access to all hydraulic components

Tiltable operator´s cab.

Quick and simple maintenance

Easy diagnostics and adjustment of engine and travel drive

Extended oil change intervals

Liebherr Hydraulic Basic 68 (standard environment: -10 to +45°C)

Liebherr Hydraulic Basic 100 (hot environment: 0 to +55°C)

Liebherr Hydraulic HVI (lower temp.: -20 to +40°C)

Liebherr Hydraulic Plus Arctic (cold environment)

Liebherr Hydraulic Plus (bio oil: -25 to +45°C)

6.000 hours*

8.000 hours*

*Note: under the condition of regular oil analysis

=> without oil analyses the change intervals are reduced by 50%.

=> even longer use of oils maybe possible if oil analysis shows a positive result

Low wear expenses

Highest ground clearance in class

Ground clearance

Liebherr PR744: 546 mm

Cat D7R-II Std: 416mm (-23%)

Komatsu D85 EX15: 450mm (-17%)

546 mm

Low wear expenses

Strong ripper design

Low wear expenses

BERCO undercarriage Additional wear plates on push

frame and inside blade (option)

Robust and grease free blade connections

Low wear expenses

Highly wear resistant

connection

(bearing insert - manufactured

from ball bearing steel)

Low wear expenses

Reinforced flat belly pan

(Hardox steel)

Low wear expenses

Protection for final drives

Versatility

Several of accessories

Different blade types

o Mechanical angle blade

o Straight blade

o Semi-U blade (7,2m³)

o U-blade (9,5m³)

o Coal U-blade

Parallelogram multi shank ripper

(with or without hydraulic pitch

adjustment)

Single shank ripper

Landfill arrangement

Cold kit arrangement

Coal and woodchip arrangement

Applications

Content

Positioning

Operator requirements

Best visibility

Low noise level

High cab comfort

Easy to handle

High safety standards

Easy to maintain

Best visibility

Large size windows

Best visibility

Integrated ROPS

FOPS protection

Best visibility

Low noise level

78 dB (A) in the cab

High cab comfort and easy to handle

Ergonomically design

Single lever control

Spacious and quit cab

All-around visibility

Tinted glass design

High heating/cooling

performance

New display RPM setting

Speed setting with memory function Inch pedal

High comfort cab

High cab comfort and easy to handle

High safety standards

Low center of gravity

Service brake through the

retardation function of the

hydrostatic drive

Complete separate parking

brake in final drives (wear

Cab with integrated

ROPS/FOPS protection

Easy to maintain

Easy access to all service points

Hinged radiator

Extra compartment for tools

Extra compartment for oil radiator

Extra compartment for E-box

Extra compartment for batteries

Tiltable cabin

Applications

Content

Positioning

PR 754

250 kW

38.621 kg

85,144 lb

306 kW

47.900 kg

105,601 lb

231 kW

38.488 kg

84,850 lb

D275AX-5

306 kW

50.714 kg

111,805 lb

D155AX-6

264 kW

39.500 kg

87,082 lb

D37-15 D375

257 kW

39.100 kg

86,201 lb

177 kW

27.000 kg

59,525 lb New

PR 744 L

185 kW

24.605 kg

54,245 lb

D7E Std.

175 kW

25.700 kg

56,658 lb

D85 EX-15

179 kW

24.610 kg

54,256 lb

D180 XLT

145 kW

21.750 kg

47,950 lb

D150B XLT

116 kW

15.965 kg

35,196 lb

D5K XL

9.408 kg

20,741 lb

D39EX-22

9.450 kg

20,834 lb

DC100 LT

9.500 kg

20,940 lb

PR 764

310 kW

50.006 kg

110,244 lb

PR 714 XL

12.600 kg

27,780 lb

D6K XL

12.886 kg

28,408 lb

D51EX-22

12.710 kg

28,020 lb

PR 724-III XL

120 kW

17.287 kg

38,110 lb

D6N-III XL

112 kW

16.955 kg

37,380 lb

D61EX-15 LT

125 kW

17.350 kg

38,250 lb

PR 734 III-XL

21.131 kg

46,586 lb

D6T XL

149 kW

20.148 kg

44,418 lb

D65EX-15 LT

153 kW

21.020 kg

46,341 lb

Long Track

6-way-blade

Without Ripper

Semi-U Blade

Standard Track

Ripper, 1-shank

Positioning

Applications

Content

Positioning

Comparison of the travel drive systems

Hydrostatic travel

(Liebherr)

Electric drive with

differential steering

(Caterpillar)

Torque converter with

differential steering

clutches and brakes

Operators control Joystick, pedal as an

option

Direction controller, pedal Direction controller,

pedals

Levers, buttons, pedals

Speed ranges variable variable 3 ranges 3 ranges

Gear shifts not required not required with buttons with buttons

Engine nominal speed constant constant variable variable

Curve radius individual individual individual limited

Turning on the spot possible limited limited not possible

Service brake and wear wear free, retardation

function of the hydrostat

wear free, retardation

function of the electric

mechanically with wear mechanically with wear

Number of travel drive

components

only 10 travel drive

components

only 10 travel drive

components

Torque converter, gear

box, bevel gear, hydr.

pump and motor, brakes

Torque converter, gear

box, bevel gear,

clutches, brakes etc.

Liebherr PR744 vs. Caterpillar D7E

Item Liebherr PR 744 Caterpillar D7E

Engine power / nominal speed KW 185 / 1.600 1/min 175 / 1.700 1/min

Operating weight* kg 28.210 27.650

Semi U-blade m³ 7,20 6,86

Track shoes (L / LGP) mm 508-710 / 914 610-660 / 914

Track gauge mm 2.992 3.016

Draw bar pull at 1,5 km/h kN 365 ca. 295

Travel drive system hydrostatic electric with hydrostatic steering

* Configuration: Semi U-blade, 3 shank ripper, track pads 660mm

Competitive Comparison

Comparison - Number of drive components

Hydrostatic travel drive PR744

1 x diesel engine

1 x splitter box

2 x hydrostatic pumps

4 x hydrostatic motors

2 x final drives

10 Drive components

Electric travel drive D7E

1 x diesel engine

1 x AC generator

1 x inverter*

2 x AC motors

1 x hydrostatic pump

1 x hydrostatic motor

1 x differential gear

2 x final drives

10 Drive components

* The inverter is not a "moving" part, yet is a required main component for the travel drive

60% fewer moving parts than D7R

Liebherr PR744 Caterpillar D7E

Comparison - productivity and fuel consumption

Comparison of performance

Slot dozing

Distance: 50m

Duration: 1 hour

Material: sand/gravel

Several tests

= 12.77 12.74 m³/l Productivity*

Caterpillar D7E

= 41.6 l/h Fuel consumption

= 530 m³/h Performance

Difference Liebherr PR744 Result (average values)

25% higher productivity than D7R

Up to 20% less fuel than D7R

* Here, productivity means the efficiency of the crawler dozer

Comparison - visibility

View to blade

Comparable lines of sight

View to blade

Comparable lines of sight

35% more visibility than D7R

View towards front

Direct front view good

Limited view toward left and right front

View towards front

Direct front view limited

View towards left and right front good,

however engine hood very high

35% more visibility than D7R

View to ripper teeth

View of two ripper teeth

Good view to ground

View to ripper teeth

View of one ripper tooth

Fuel tank partially obstructs view to ground

Comparison - additional details

Connection to blade

Ball connection

Maintenance free => no lubrication required

Connection to blade

Ball-and-socket joint with pin joint

Not maintenance free => requires

lubrication

Comparison - additional details

Valve block for rear ripper

The valve block is integrated and protected in

the main frame

Hydraulic hoses

with spiral protection

Valve block for rear ripper

The valve block lies unprotected outside

of the main frame

Hydraulic hoses

without spiral protection

Thank you very much for your

attention!

Caterpillar D7R-II vs. Liebherr PR 744

Item Caterpillar

D7R-II Std. DS- Tier II

Liebherr

PR 744 L – Tier III

Difference

Engine output 179 @ 2.100 rpm 184 kW @ 1.600 rpm + 3 %

- Displacement 10,3 l 10,5 l

Drawbar pull at 1,5 km/h ca. 290 kN 340 kN + 17 %

Operating weight* 28.365 kg 28.475 kg

- Engine output/weight 6,31 kW/t 6,46 kW/t + 2,2 %

Length of track on ground 2.870 mm 2.992 mm + 4,2 %

Ground clearance 414 mm 545 mm + 31 %

Cab sound level (ISO 6396) 83dB (A) 78 dB (A) 5 db undertone

Cooling fan Belt driven hydrostatic

Komatsu D85 EX-15 vs. Liebherr PR 744 L

Manufacturer

Komatsu

D85 EX-15 - II

Liebherr

PR 744 L

Difference

Engine output 179 @ 1.900 rpm 184 kW @ 1.600 rpm + 3 %

- Displacement 11,0 l 10,5 l -4,5 %

Drawbar pull at 1,5 km/h ca. 335 kN 340 kN + 1,4 %

Operating weight* 28.180 kg 28.475 kg +1 %

- Engine output/weight 6,35 kW/t 6,46 kW/t +1,7 %

Length of track on ground 3.050 mm 2.992 mm - 1,9 %

Cab sound level (ISO 6396) 79 dB (A) 78 dB (A) 1 db undertone

Cooling fan hydrostatic hydrostatic

Slot dozing test 1 & 2

Result: Trial 1 & 2 (slot dozing)

Fuel consumption Komatsu Up to 10 % more !!!

Pushing performance equal

New Holland D255 vs. Liebherr PR 744 L

Manufacturer

New Holland

D255 - II

Liebherr

PR 744 L

Difference

Engine output 177 KW @ 2.200 rpm 184 kW @ 1.600 rpm + 3,9 %

- Displacement 8,3 l 10,5 l + 26 %

Drawbar pull at 1,5 km/h ca. 255 kN 365 kN + 43 %

Operating weight* 30.400 kg 28.475 kg - 6,3%

- Engine output/weight 5,82 kW/t 6,46 kW/t + 11 %

Length of track on ground 2.973 mm 2.992 mm

Cab sound level (ISO 6396) ? 78 dB (A) ?

Cooling fan ? hydrostatic ?

Thank you very much for your

attention!

Travel Drive Comparison:

Hydrostat vs. Differential Steering

The travel drive system of our competitors

The differential steering system

Travel drive components:

1 Torque converter

2 Power shift transmission

3 Hydrostatic pump

4 Hydrostatic motor

5 Differential steering gear box

6 Service brake (= also parking brake)

7 Final drive

Operators control:

1 Direction controller for choosing the

direction and steer the dozer

2 Button for gear shifting

3 Brake pedal

4 Deceleration pedal

The differential steering system

1 Torque converter

3 Hydrostatic pump

4 Hydrostatic motor

5 Differential steering gear box

6 Service brake (= also parking brake)

7 Final drive

Operators control:

3 Brake pedal

Components (Differential Steering System)

1) Torque converter (hydrodynamic)

(Diesel Engine)

Output

Stator

Turbine Pump

2) Power shift transmission (3 stage gear)

a) 5 x planetary gears

b) 5 x clutches

Each shift from one to the other gear stage

Need two open and close two clutches at

the same time! a) a) a) a) a)

b) b) b) b) b)

3) Hydrostatic pump (as Liebherr)

4) Hydrostatic motor (as Liebherr) and

5) Differential gear box

6) Service brake

7) Final drive

Comparison of the travel drive system

Hydrostatic travel drive Torque converter with differential

steering

Operators control Single Joystick Direction controller, pedals

Speed ranges and gear shifting Variable 3 ranges

Gear shifts not required with buttons

Engine nominal speed constant variable

Curve radius individual individual

Power always on both tracks yes yes

Turning on the spot possible limited

Service brake and wear wear free, retardation function of the

hydrostat

mechanically with wear

Number of travel drive components Splitter box, hydrostatic pumps and

motors ! Less Parts !

Torque converter, gear box, bevel

gear, hydr. pump and motor, brakes

Comparison:

Hydrostat vs. Clutches and Breakes

System with clutches and brakes

1 Torque converter

3 Bevel gear box

4 Clutches

6 Service brakes (= also parking brake)

7 Final drive

Operators control:

3 Brake pedal

1) Torque converter (hydrodynamic)

(Diesel Engine)

Output

Stator

Turbine Pump

2) Power shift transmission (3 stage gear)

a) 5 x planetary gears

b) 5 x clutches

Each shift from one to the other gear stage

Need two open and close two clutches at

the same time!

a) a) a) a) a)

b) b) b) b) b)

3) Bevel gear box

4) Clutches

5) Brakes

6) Final drive

Comparison of the travel drive system

Hydrostatic travel drive Torque converter with clutches and

brakes

Operators control Single Joystick Levers, buttons, pedals

Speed ranges and gear shifting Variable 3 ranges

Gear shifts not required required, with buttons

Engine nominal speed constant variable

Curve radius individual limited

Power on both tracks during steering yes no

Turning on the spot possible not possible

Service brake and wear wear free due the retardation function of

the hydrostat

mechanically with wear

Number of travel drive components Splitter box, hydrostatic pumps and

motors

! Less Parts !

Torque converter, gear box, bevel

gear, clutches, brakes

Comparison:

Low Drive vs. High Drive

Comparison

Standard track

Delta drive

Track - Comparison

Comparison

Standard track vs. Delta drive

Standard track

Chain wrap 180°

Always 8 - 9 teeth in contact

Delta drive

Chain wrap 90°

Only 3 - 4 teeth in contact

Shorter track chain

Shorter tension length

Two idlers less

Less replacement costs

Less wear on the track chains

Fewer track pads

Less replacement costs

Lower noise emission

Less oscillation of the untensioned

Comparison

Caterpillar says:

Sprocket is out of dirty area - means less wear of sprocket and bushes

Gearbox is out of dirty area - means less stress load of gearbox sealing

Liebherr says:

There sticks material between sprockets and bushes too (pic 1)

Cumulated material will enter space between sprocket and track frame

(1) and presses gearbox from the bottom up (2) – high stress load of final

drive bearings

Standard track

Low mounted hydrostatic travel drive components

and the design of the standard undercarriage allows

a low centre of gravity

Less danger of overturning during traversing slopes

Delta drive

Centre of gravity is higher due to high position of

torque converter an gear box:

Danger of overturning when traversing slopes

Comparison

Liebherr

Caterpillar

Comparison

New Caterpillar D7E (30t dozer) with standard track?!?

Comparison of the travel drive systems

Comparison „Turning on the spot“

Hydrostatic travel drive

(Liebherr, partly CAT)

Not possible!

differential steering (CAT, Komatsu, Fiat )

clutches and brakes

(CAT, Komatsu, Fiat)

PR742 vs. PR744

Design

Final drive mounted in track frame Final drive mounted in main frame

More space for stronger

components

PR 742 (PR 712, PR 722, PR 732) PR 744 (PR 724, PR 734, PR 752)

Comparison

Design

PR 742

1 … Planetary gear

PR 744

1 … Spure gear

mounted in

Track frame

Öl-Reservoir –

automatical seal

Motor mounted

in main frame

Comparison

Liebherr PR 744 L vs. PR 742 B

Bezeichnung Liebherr

PR 744 L

Liebherr

PR 742 B

Engine power KW 184 @ 1600 1/min 172 @ 1800 1/min

Operation weight Kg 27.910 25.950

Width of shoes mm 610 610

High of grouser mm 71,5 58,0

Track on ground mm 2.992 2.960

Blade Semi-U Semi-U

Blade capacity m³ 7,20 7,42

+ 7,5%

Comparison

PR 742 vs. PR 744 L - Slot dozing 50 meters

Comparison

Blade rolling ability

Comparison

PR 742 vs. PR 744 L - Slot dozing 50 meters

Basic data:

Pushing distance: 50 m

Duration: 1 hour

Result:

Higher pushing performance

High efficiency

Measurements Liebherr PR 742 B Liebherr PR 744 L Difference

Pushed volume m³ 205 229 +12%

Fuel consumption l/h 39,15 36,2 -7,5%

Pushed volume to fuel

consumption

m³/l 5,2 6,3 +21%

Material: wet clay

Comparison

Comparison PR 742 B vs. PR 744 L

Issue Liebherr

PR 742 B

Liebherr

PR 744 L

Add. value

PR 744 L

Operating weight * Kg 25.550 27.910 + 9,2 %

Engine output KW 172 184 + 6,9 %

Stage III no yes +

Injection system mechanically Pump-line-nozzle system +

Displacement l 10 10,5 + 5 %

Hydrostatic travel drive 1 motor each side 2 motors each side +

Final drive 2 stage plan. gear box Spure- and 2 stage plan. gear +

Draw bar pull at 1km/h KN 285 365 + 28 %

Steering force KN + +

Operators cab New design (and reduced db(A) +

Performance (slot dozing) +12% + 12%

Economy +21 % + 21%

Blade rolling ability + +

3 shank ripper weight kg 2.600 3.295 + 26%

Comparison

Liebherr Hydraulic Oil

Experience the Progress - ois-liebherr.comois-liebherr.com/images/pdf/PR744-Application.pdf ·...

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