Manual Transmission - PREVOST XL Series Manual

Motorcoach

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Instruction manual (46 pages)

Table of Contents

B) Neutral (N)

Use this position to start engine. Select neutral

(N) when checking vehicle accessories, and for

extended periods of engine idle operation; parking

brake must then be applied.

shifter will automatically select neutral when the

master switch is turned on.

CAUTION

: Detroit Diesel engines should not be

idled for extended periods at "low" idle.

extended idling, engine should run at "fast" idle.

WARNING:

Always apply parking brake before

leaving driver's seat.

Do not allow your vehicle to "coast" in Neutral.

This practice can result in transmission damage.

Also, no engine braking is available in Neutral.

C) Drive (D)

Use this position for all normal driving conditions.

After touching this pad, the vehicle will start in first

or second range and will automatically upshift to a

higher range as output speed increases. As the

vehicle slows down, output speed decreases, and

the transmission automatically downshifts to the

correct range. If a locked brake or a slick surface

condition should occur, the ECU (Electronic

Control Unit) will command converter operation

(disconnect lockup) and inhibit downshifts for a

period of time or until normal wheel speed has

been restored.

NOTE:

The transmission should normally be

allowed to shift itself, but manual shifting can be

used as described below.

D) Fourth (4) and Third (3) ranges

Select these ranges when driving on moderate

grades, or when load and traffic conditions require

the use of limited speed.

E) Second (2) range

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.

progressively greater engine(*) and retarder(*)

braking power (the lower the range, the greater

the engine(*) and retarder(*) braking effect).

The pushbutton

For

Low ranges provide

F) First (1) range

Select this range when pulling through mud and

snow, or when speed control is needed for driving

up steep grades.

maximum engine(*) braking power or retarder(*)

braking effect. In the lower ranges (1, 2, 3, and

4), transmission will not upshift above the highest

gear selected unless recommended engine

governed speed for that gear is exceeded.

CAUTION:

Service brakes (foot pedal) 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(*)). When descending in lower ranges,

care must be taken that engine speed does not

exceed 2450 rpm. This procedure keeps service

brakes cool and ready for emergency stopping.

- (*) -

Refers to "JACOBS engine brake" and

"Transmission output retarder" options.

See pages 4-3 & 4-4 for details regarding

both systems.