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Gradeability/Speed/Rimpull: Gross Weight

This document summarizes how to determine the gradeability and rimpull of a haul truck. It provides the following information: 1) Gradeability is determined by reading from the gross weight down to the percent of total resistance at maximum speed, where total resistance equals the actual grade plus 1% for every 10 kg/t of rolling resistance. 2) Usable rimpull depends on the available traction and weight on the drive wheels. 3) A graph shows the rimpull curves for different gears at varying grades, speeds, and weights to illustrate the truck's performance.

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Pedro
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476 views1 page

Gradeability/Speed/Rimpull: Gross Weight

This document summarizes how to determine the gradeability and rimpull of a haul truck. It provides the following information: 1) Gradeability is determined by reading from the gross weight down to the percent of total resistance at maximum speed, where total resistance equals the actual grade plus 1% for every 10 kg/t of rolling resistance. 2) Usable rimpull depends on the available traction and weight on the drive wheels. 3) A graph shows the rimpull curves for different gears at varying grades, speeds, and weights to illustrate the truck's performance.

Uploaded by

Pedro
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Gradeability/Speed/Rimpull

To determine gradeability performance: Read from gross horizontally to the curve with the highest obtainable gear, then
weight down to the percent of total resistance. Total resistance down to maximum speed. Usable rimpull will depend upon
equals actual percent grade plus 1% for each 10 kg/t (20 lb/ton) traction available and weight on drive wheels.
of rolling resistance. From this weight-resistance point, read

Direct Drive
Torque Converter Drive
E – Typical Field Empty Weight
L – Target Gross Machine Operating Weight 163 293 kg (360,000 lb)

Gross Weight
0 50 100 150 200 250 300 350 400 lb x 1000

0 20 40 60 80 100 120 140 160 180 200 kg x 1000


lb x kg x
1000 1000
70
150 E L
65
140
130 60

120 55
1st Gear 30%
110 50

(Grade plus Rolling)


100

Total Resistance
45
25%
90
40
Rimpull

80
35 20%
70
30
60 1st Gear 15%
25
50
20 2nd Gear
40 10%
15 3rd Gear
30
4th Gear
20 10 5th Gear 5%
6th Gear
10 5 Torque Converter Drive 7th Gear
Direct Drive
0 0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 km/h

0 5 10 15 20 25 30 35 40 45 mph
Speed

22 777F Off-Highway Truck specifications

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