OPERATING CONDITIONS

TYPICAL DOZER OPERATING SPEEDS

TIME IN MINUTES

RETURN

$100FT(30m)$ OR LESS

Over $100FT(30m)$

MAXIMUM REVERSE SPEED IN SECOND

RANGE $($POWER SHIFT$)$ OR REVERSE SPEED

IN GEAR USED FOR DOZING $($DIRECT DRIVE$)$

MAXIMUM REVERSE SPEED IN THIRD

RANGE $($POWER SHIFT$)$ OR HIGHEST

REVERSE SPEED $($DIRECT DRIVE$)$the tractor scraper whose travel time curves are shown in figures $4-4$ and $4-5,$ hauls its rated payload $1220$m up a $5\%$ grade from the cut to the fill and returns empty over the same route. The rolling resistance factor for the haul road is $60$ kg$/$tonne$.$ Estimate the scraper travel time.