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1
Experience the Progress
Liebherr Crawler Tractor PR744
2
Liebherr Crawler Dozer PR 744
3
Applications
Content
Comparisons Operator Requirements
Technical Data Customer Requirements
Positioning
4
Applications
Content
Comparisons Operator Requirements
Technical Data Customer Requirements
Positioning
5
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
7
Applications
Content
Comparisons Driver Requirements
Technical Data Customer Requirements
Positioning
9
Earth moving - Spain
Application
17
Application
Creating skiing slopes – North Italy
18
Application
Stripping top soil - Austria
20
Road Construction - Algeria
Application
21
Earth moving - Algeria
Application
22
Application
Waste handling
23
Application
Waste handling - Canada
24
Application
Road Construction - USA
25
Applications
Content
Comparisons Driver Requirements
Technical Data Customer Requirements
Positioning
26
Buyers requirements
High performance
High reliability
Low fuel consumption
Low service expenses
Low wear expenses
Versatility
27
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
30
High performance
Power train – PR 744
Final drive with
sprocket
Hydraulic hoses
Hydraulic motor(s)
Left travel pump
31
High performance
Scheme of the hydrostatic system
Input
Low pressure
Hydrostatic motor Hydrostatic pump
High pressure Swivel plate
Stroke
Output
Swivel plate
Stroke
33
High performance
Single
Joystick
Control
34
High performance
Ripping comparison => Hydrostatic Drive vs. Torque Converter
35
Optimum blade contour for excellent material flow
High performance
36
High reliability
Two separate cooling systems on Liebherr large size dozers
Hydraulic
oil cooler Engine cooler
37
High reliability
Scheme of the suctioning hydrostatic fan
38
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)
EN
GIN
E
39
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
speed
Quick warm up of the diesel engine
Less noise level
40
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
41
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
Low fuel consumption
42
Low service expenses
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
1)
2)
3) 4)
5)
6)
7) 8) 9)
10)
43
Low service expenses
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.
44
Low service expenses
Quick and simple maintenance
Easy diagnostics and adjustment of engine and travel drive
45
Low service expenses
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
46
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
47
Low wear expenses
Strong ripper design
48
Low wear expenses
BERCO undercarriage Additional wear plates on push
frame and inside blade (option)
49
Robust and grease free blade connections
Low wear expenses
Highly wear resistant
connection
(bearing insert - manufactured
from ball bearing steel)
50
Low wear expenses
Reinforced flat belly pan
(Hardox steel)
51
Low wear expenses
Protection for final drives
52
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
53
Applications
Content
Comparisons Operator Requirements
Technical Data Customer Requirements
Positioning
54
Operator requirements
Best visibility
Low noise level
High cab comfort
Easy to handle
High safety standards
Easy to maintain
55
Best visibility
Large size windows
57
Best visibility
58
Low noise level
78 dB (A) in the cab
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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
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New display RPM setting
Speed setting with memory function Inch pedal
High comfort cab
High cab comfort and easy to handle
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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
free)
Cab with integrated
ROPS/FOPS protection
62
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
63
Applications
Content
Comparisons Operator Requirements
Technical Data Customer Requirements
Positioning
PR 754
250 kW
38.621 kg
85,144 lb
Lieb
herr
D9T
306 kW
47.900 kg
105,601 lb
D8T
231 kW
38.488 kg
84,850 lb
D3K
Cat
erpi
llar
D4K
D10T
D11R
D275AX-5
306 kW
50.714 kg
111,805 lb
D155AX-6
264 kW
39.500 kg
87,082 lb
Kom
atsu
D37-15 D375
D475
D575
D350
257 kW
39.100 kg
86,201 lb
D255
177 kW
27.000 kg
59,525 lb New
Hol
land
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
DC85
DC95
D180 XLT
145 kW
21.750 kg
47,950 lb
D150B XLT
116 kW
15.965 kg
35,196 lb
D5K XL
74 kW
9.408 kg
20,741 lb
D39EX-22
79 kW
9.450 kg
20,834 lb
DC100 LT
75 kW
9.500 kg
20,940 lb
PR 764
310 kW
50.006 kg
110,244 lb
PR 714 XL
86 kW
12.600 kg
27,780 lb
D6K XL
93 kW
12.886 kg
28,408 lb
D51EX-22
97 kW
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
150kW
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
65
Applications
Content
Comparisons Driver Requirements
Technical Data Customer Requirements
Positioning
66
Comparison of the travel drive systems
Hydrostatic travel
drive
(Liebherr)
Electric drive with
differential steering
(Caterpillar)
Torque converter with
differential steering
Torque converter with
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
drive
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
etc.
Torque converter, gear
box, bevel gear,
clutches, brakes etc.
67
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
68
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
69
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*
41.4
529
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
70
Comparison - visibility
Liebherr PR744 Caterpillar D7E
View to blade
Comparable lines of sight
View to blade
Comparable lines of sight
35% more visibility than D7R
71
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
Comparison - visibility
Liebherr PR744 Caterpillar D7E
72
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 - visibility
Liebherr PR744 Caterpillar D7E
73
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
Liebherr PR744 Caterpillar D7E
74
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
Liebherr PR744 Caterpillar D7E
75
Thank you very much for your
attention!
76
Competitive Comparison
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
77
Competitive Comparison
Komatsu D85 EX-15 vs. Liebherr PR 744 L
Manufacturer
Type
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 %
Ground clearance 450 mm 545 mm + 21 %
Cab sound level (ISO 6396) 79 dB (A) 78 dB (A) 1 db undertone
Cooling fan hydrostatic hydrostatic
78
Slot dozing test 1 & 2
Competitive Comparison
79
Result: Trial 1 & 2 (slot dozing)
Fuel consumption Komatsu Up to 10 % more !!!
Pushing performance equal
Competitive Comparison
80
Competitive Comparison
New Holland D255 vs. Liebherr PR 744 L
Manufacturer
Type
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
Ground clearance 460 mm 545 mm + 18 %
Cab sound level (ISO 6396) ? 78 dB (A) ?
Cooling fan ? hydrostatic ?
81
Thank you very much for your
attention!
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Travel Drive Comparison:
Hydrostat vs. Differential Steering
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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
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bherr
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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
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bherr
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The travel drive system of our competitors
Components (Differential Steering System)
1) Torque converter (hydrodynamic)
Input
(Diesel Engine)
Output
shaft
Stator
Turbine Pump
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bherr
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The travel drive system of our competitors
Components (Differential Steering System)
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)
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bherr
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The travel drive system of our competitors
Components (Differential Steering System)
3) Hydrostatic pump (as Liebherr)
4) Hydrostatic motor (as Liebherr) and
5) Differential gear box
3
4 5
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The travel drive system of our competitors
Components (Differential Steering System)
6) Service brake
7) Final drive
6
7
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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
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Comparison:
Hydrostat vs. Clutches and Breakes
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The travel drive system of our competitors
System with clutches and brakes
Travel drive components:
1 Torque converter
2 Power shift transmission
3 Bevel gear box
4 Clutches
6 Service brakes (= 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
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bherr
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The travel drive system of our competitors
1) Torque converter (hydrodynamic)
Input
(Diesel Engine)
Output
shaft
Stator
Turbine Pump
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bherr
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The travel drive system of our competitors
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)
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The travel drive system of our competitors
3) Bevel gear box
4) Clutches
5) Brakes
6) Final drive
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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
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Comparison:
Low Drive vs. High Drive
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Comparison
Standard track
Delta drive
Track - Comparison
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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
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Standard track vs. Delta drive
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
track
Comparison
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Comparison
Standard track vs. Delta drive
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
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bherr
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Standard track vs. Delta drive
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
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bherr
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Comparison
New Caterpillar D7E (30t dozer) with standard track?!?
103
Comparison of the travel drive systems
Comparison „Turning on the spot“
Hydrostatic travel drive
(Liebherr, partly CAT)
Not possible!
Torque converter with
differential steering (CAT, Komatsu, Fiat )
Torque converter with
clutches and brakes
(CAT, Komatsu, Fiat)
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bherr
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PR742 vs. PR744
105
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
106
Design
M
PR 742
1 … Planetary gear
2 … Planetary gear
PR 744
1 … Spure gear
2 … Planetary gear
3 … Planetary gear
M
1 1
2 3
Motor
mounted in
Track frame
2
Öl-Reservoir –
automatical seal
check
Motor mounted
in main frame
Comparison
107
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%
+ 7 %
Comparison
108
PR 742 vs. PR 744 L - Slot dozing 50 meters
Comparison
109
Blade rolling ability
Comparison
110
PR 742 vs. PR 744 L - Slot dozing 50 meters
Basic data:
Pushing distance: 50 m
Duration: 1 hour
Result:
Higher pushing performance
Low fuel consumption
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
111
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
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bherr
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Liebherr Hydraulic Oil
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bherr
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Liebherr Hydraulic Oil
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bherr
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Liebherr Hydraulic Oil
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![INDEX []cranes over 100 tons index lg-1550 liebherr ltm 1500 liebherr ltm-1400 liebherr ltm-1225 liebherr ltm-1220 liebherr ltm-1130 liebherr ltr-1100 liebherr](https://img.dokumen.tips/doc/110x75/5e6bde846cd1285bdf61f15a/index-cranes-over-100-tons-index-lg-1550-liebherr-ltm-1500-liebherr-ltm-1400.jpg)
