1351 / 2440
19-56 Edition 47
Bulldozers
Measuring Production
On-the-Job
●
Attachments
MEASURING PRODUCTION ON-THE-JOB
Three generally accepted methods of measuring bull-
dozer production are listed below. The third method is
empirical, but is the simplest to conduct.
1. Employing Surveying Techniques
a. Conduct time study and then cross-section the
cut to determine the volume of material removed.
(Production in Bm
3
or BCY per unit of time)
b. Conduct time study and then cross-section the fill
to determine the volume of fill material. (Produc-
tion in Lm
3
or LCY per unit of time)
2. Weighing Blade Loads
Conduct time study and weigh material moved
by bulldozer by weighing the loader bucket loads.
3. Measuring Blade Loads
a. Dozer operation
(1) Pick up and carry load onto a level area and
stop.
(2) Raise the blade directly over the pile pulling
forward slightly as blade comes up, leaving a
nearly symmetrical pile.
(3) Reverse to clear the pile.
b. Measurements
(1) The average
height
(H) of the pile in feet. Hold
the tape vertically at the inside edge of each
grouser mark. Sight along top of the pile to
obtain the correct measurement.
(2) The average
width
(W) of the pile in feet. Hold the
tape horizontally over the pile and sight at the inside
edge of each grouser mark and the corresponding
opposite side of the pile.
(3) The greatest
length
(L) of the pile in feet.
Hold the tape horizontally over the pile and
sight at each end of the pile.
c. With the above measurements, now compute the
blade load.
(1) Average the height measurement (H)
(2) Average the width measurement (W)
(3) Load (Lm
3
or LCY) = 0.0138
×
(HWL)
(4) Load (Bm
3
or BCY) = Lm
3
or LCY
×
LF
d. Combine the calculated blade load with time
study to figure production.
VARIABLE RADIUS (VR)
SEMI-U BLADES
D6T
D7R
D8R/D8T
Capacity
5.81 m
3
7.6 yd
3
7.84 m
3
10.25 yd
3
11.28 m
3
14.75 yd
3
Width
3349 mm
11'0"
3912 mm
12'10"
4369 mm
14'4"
Height
1473 mm
4'10"
1626 mm
5'4"
1778 mm
5'10"
Weight
1360 kg
3000 lb
2000 kg
4400 lb
3010 kg
6640 lb
LANDFILL BLADES
D6T
D7E
D7R
Capacity
12.5 m
3
16.4 yd
3
14 m
3
18.4 yd
3
18.1 m
3
23.7 yd
3
Width
3886 mm
12'9"
3713 mm
12'2"
4267 mm
14'0"
Height
1796 mm
5'10.7"
1524 mm
5'0"
2083 mm
6'10"
Weight
1450 kg
3200 lb
4380 kg
9636 lb
2608 kg
5750 lb
LANDFILL BLADES
D8R/D8T
D9R/D9T
Capacity
24.4 m
3
32 yd
3
38.5 m
3
50.3 yd
3
Width
4928 mm
16'2"
5442 mm
17'10"
Height
2286 mm
7'6"
2178 mm
7'1.75"
Weight
3175 kg
7000 lb
4900 kg
10,800 lb
This list is not all inclusive. Contact your Cat dealer for special attachment needs.
TOPVIEW
SIDEVIEW
GROUSER MARKS
ATTACHMENTS