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Engine and retarder brake chart
Below diagram gives guidelines for calculation of the dump truck engine and retarder brake performance related to rolling + grade. The traction capabilities depend on the ground conditions and surroundings, i.e. available wheel grip (friction), tyre pattern, weight on the wheels, etc. If the driving conditions (f.ex curves) requires hard decellerating by using the main brake, driving in a lower gear is advised. How to find downhill gradeability capacity: 1.Read from actual dump truck weight (A) up to the percentage grade (B) (Rolling resistance is not included in the percentage grade). 2.From this point, read horizontally to the curve with highest speed range (C). 3.Then down to maximum speed (D).
