Module 5.1 Bulldozers

Question 1

Type of Bulldozers (dozer, crawler, track-type tractor)

Answer 1

LOW-TRACK DOZER

WHEELED DOZER

HIGH-TRACK DOZER

Question 2

Smaller Bulldozers are built for:

Answer 2

SPEED

MANEUVERABILITY

Question 3

Large Bulldozers are built for:

Answer 3

HIGH PRODUCTION

Question 4

Characteristics of Small Dozers

Answer 4

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

Question 5

Characteristics of Large Dozers

Answer 5

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

Question 6

High-Speed Dozer (Specialty Machine)

Answer 6

CAN OPERATE UP TO 25KPH

ARTICULATED FRAME FOR MANEUVERABILITY

RUBBER TRACKS ALLOW MACHINE TO MOVE ACROSS CONCRETE AND PAVEMENT

Question 7

When choosing a bulldozer for your project, assess:

Answer 7

VOLUME OF WORK - DRAWINGS

TYPE OF WORK - SPECIFICATIONS

DURATION OF WORK - SCHEDULE

EXISTING SITE CONDITIONS - CONSULTANT REPORTS

Question 8

Bulldozers Machine Parts:

Answer 8

OPERATOR’S CAB

ROPS (Roll Over Protection System)

ENGINE

BLADE

UNDER CARRIAGE & TRACKS

RIPPER

PUSH ARM

TILT CYLINDERS

HOIST RAMS

Question 9

Bulldozers: The Blade

Answer 9

BLADE

CUTTING EDGE

CORNER BIT

Question 10

To maximize production

Answer 10

MATCH THE BLADE TO THE MACHINE

Question 11

General Purpose Blades

Answer 11

STRAIGHT BLADE

POWER ANGLE & TILT BLADE

VARIABLE RADIUS BLADE

Question 12

Power Angle & Tilt Blade

Answer 12

PAT BLADE

Question 13

Production blades

Answer 13

UNIVERSAL BLADE (U-BLADE)

SEMI-UNIVERSAL BLADE (SU-BLADE)

HEAVY DUTY UNIVERSAL BLADE

Question 14

Special Applications Blades

Answer 14

RAKE BLADE

LANDFILL BLADE

WOOD CHIP BLADE

Question 15

Special application blades

Answer 15

BLADES DESIGNED FOR SPECIFIC APPLICATIONS

DESIGN IS BASED ON THE TYPE OF MATERIAL & TYPE OF TERRAIN

Question 16

Bulldozer attachments

Answer 16

ARE OFTEN INSTALLED AT INITIAL PURCHASE

INCREASE THE VERSATILITY OF A BULLDOZER

Question 17

Bulldozer attachments

Answer 17

RIPPERS

WINCHES

ROLLERS (TOW BEHIND)

SIDE BOOMS

Question 18

Bulldozer -Machine Standards

Answer 18

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.

Question 19

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.

Answer 19

RIMPULL FORCE

Question 20

The pulling ability, or force, of a machine.

The difference between the tractive effort available and tractive effort required to move / tow something.

Answer 20

DRAWBAR PULL

Question 21

Complex and powerful machines that require complete attention for proper control.

Answer 21

PERSONAL SAFETY

SAFETY OF OTHERS

SAFETY OF THE EQUIPMENT

Question 22

Machine safety considerations

Answer 22

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.

Question 23

Bulldozer - Calculating Production (Factors to consider)

Answer 23

SIZE & CONFIGURATION OF BLADE

SIZE OF TRACTOR

DISTANCE MATERIAL IS TO BE MOVED

TYPE & CONDITION OF MATERIAL

WORKING CONDITIONS

Question 24

Bulldozer productivity is measured by

Answer 24

ESTIMATING VOLUME OF MATERIAL PER CYCLE

ESTIMATING THE NUMBER OF CYCLES PER HOUR

Question 25

Bulldozer - Production Formula

Answer 25

PRODUCTION = 60 MIN X BLADE LOAD / PUSH TIME + RETURN TIME + MANEUVER