Module 5.1 Bulldozers Flashcards
Type of Bulldozers (dozer, crawler, track-type tractor)
LOW-TRACK DOZER
WHEELED DOZER
HIGH-TRACK DOZER
Smaller Bulldozers are built for:
SPEED
MANEUVERABILITY
Large Bulldozers are built for:
HIGH PRODUCTION
Characteristics of Small Dozers
ENGINE POWER - 43HP
TRACK SHOE WIDTH - 12INCHS
OVERALL LENGTH - 11 FT
BLADE WIDTH - 7 FT
BLADE CAPACITY - 1 CUBIC YARD / 0.76 CUBIC METER
MACHINE WEIGHT - 8690 LBS
Characteristics of Large Dozers
ENGINE POWER - 1150HP
TRACK SHOE WIDTH - 34 INCHS
OVERALL LENGTH - 38 FT
BLADE WIDTH - 24 FT
BLADE CAPACITY - 90 CUBIC YARD / 68.81 CUBIC METER
MACHINE WEIGHT - 336,420 LBS
High-Speed Dozer (Specialty Machine)
CAN OPERATE UP TO 25KPH
ARTICULATED FRAME FOR MANEUVERABILITY
RUBBER TRACKS ALLOW MACHINE TO MOVE ACROSS CONCRETE AND PAVEMENT
When choosing a bulldozer for your project, assess:
VOLUME OF WORK - DRAWINGS
TYPE OF WORK - SPECIFICATIONS
DURATION OF WORK - SCHEDULE
EXISTING SITE CONDITIONS - CONSULTANT REPORTS
Bulldozers Machine Parts:
OPERATOR’S CAB
ROPS (Roll Over Protection System)
ENGINE
BLADE
UNDER CARRIAGE & TRACKS
RIPPER
PUSH ARM
TILT CYLINDERS
HOIST RAMS
Bulldozers: The Blade
BLADE
CUTTING EDGE
CORNER BIT
To maximize production
MATCH THE BLADE TO THE MACHINE
General Purpose Blades
STRAIGHT BLADE
POWER ANGLE & TILT BLADE
VARIABLE RADIUS BLADE
Power Angle & Tilt Blade
PAT BLADE
Production blades
UNIVERSAL BLADE (U-BLADE)
SEMI-UNIVERSAL BLADE (SU-BLADE)
HEAVY DUTY UNIVERSAL BLADE
Special Applications Blades
RAKE BLADE
LANDFILL BLADE
WOOD CHIP BLADE
Special application blades
BLADES DESIGNED FOR SPECIFIC APPLICATIONS
DESIGN IS BASED ON THE TYPE OF MATERIAL & TYPE OF TERRAIN
Bulldozer attachments
ARE OFTEN INSTALLED AT INITIAL PURCHASE
INCREASE THE VERSATILITY OF A BULLDOZER
Bulldozer attachments
RIPPERS
WINCHES
ROLLERS (TOW BEHIND)
SIDE BOOMS
Bulldozer -Machine Standards
DESIGNED FOR MAXIMUM POWER & STABILITY ON SLOPES & IRREGULAR TERRAIN
- THEY WORK AT SLOWER SPEEDS (UP TO 16KPH / 10 MPH)
- THEY HAVE GOOD TRACTION, STABILITY & LOW CENTER OF GRAVITY.
- UPRIGHT BLADE ALLOWS FOR MAXIMUM MOVEMENT OF MATERIALS
- TRACKED UNITS HAVE GROUSER SHOES THAT PENETRATE THE GROUND FOR ADDED TRACTION
- WHEELED UNITS CAN OPERATE FASTER, BUT DO NOT HAVE THE SAME LEVEL OF TRACTION.
The amount of force exerted at the point where the tire / track touches the ground to propel the machine.
The force is limited by traction.
RIMPULL FORCE
The pulling ability, or force, of a machine.
The difference between the tractive effort available and tractive effort required to move / tow something.
DRAWBAR PULL
Complex and powerful machines that require complete attention for proper control.
PERSONAL SAFETY
SAFETY OF OTHERS
SAFETY OF THE EQUIPMENT
Machine safety considerations
DO NOT GO NEAR AN OPERATING DOZER.
GET OPERATOR’S EXPRESSED PERMISSION TO ACCESS THE WORK AREA.
STAY AWAY FROM THE TOP OF BANKS OR SLOPES WHERE MACHINES ARE WORKING.
OPERATORS MAY HAVE LIMITED VISION IN ALL DIRECTIONS - APPROACH FROM THE FRONT OF THE MACHINE.
Bulldozer - Calculating Production (Factors to consider)
SIZE & CONFIGURATION OF BLADE
SIZE OF TRACTOR
DISTANCE MATERIAL IS TO BE MOVED
TYPE & CONDITION OF MATERIAL
WORKING CONDITIONS
Bulldozer productivity is measured by
ESTIMATING VOLUME OF MATERIAL PER CYCLE
ESTIMATING THE NUMBER OF CYCLES PER HOUR
Bulldozer - Production Formula
PRODUCTION = 60 MIN X BLADE LOAD / PUSH TIME + RETURN TIME + MANEUVER
