CONTROLS AND INSTRUMENTS
Select this range when pulling through mud and
snow or when speed control is needed for
driving up steep grades. This range also
provides maximum engine braking power or
retarder braking effect. In the lower ranges (1,
2, 3 and 4), the transmission will not upshift
above the highest gear selected unless engine
overspeed is detected.
Note: The transmission should normally be
allowed to shift by itself, but manual shifting can
be done as described below.
• Second range (2)
Select this range when operating in heavy and
congested traffic. The transmission will start in
first and automatically upshift to second. When
slowing, the transmission will automatically
downshift to first range. Low ranges provide
progressively greater engine and retarder
braking power (the lower the range, the greater
the engine and retarder braking effect).
• Third and fourth ranges (3 and 4)
Select these ranges when driving on moderate
grades or when load and traffic conditions limit
speed.
Warning: Service brakes should not be used
to control the speed of vehicle on long, steep
descents. Instead, lower transmission ranges
should be used (in conjunction with output
retarder. Refer to "JACOBS Engine Brake" and
"Transmission Retarder" headings in "Technical
Information" chapter 4 for details regarding both
systems. This procedure keeps service brakes
cool and ready for emergency stopping.
Caution: When descending in lower ranges,
care must be taken that engine speed does not
exceed 2,450 rpm.
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