Controls and Instruments 4-11
PA-1628Operator's ManualH3-45 COACH
HORNS
The electric horn (city horn) and air horn (highway
horn) are operated from the steering wheel center
pad. Use the Horn Selector switch located on the
lateral control panel to select the appropriate horn
type.
NOTE
When the vehicle is stationary, the electric horn
will sound to inform the driver that a fire is detected
in the engine compartment.
STEERING WHEEL
TRANSMISSION RETARDER
The transmission retarder is available only with the
Allison transmission.
The retarder can be operated using a hand lever
mounted on the steering wheel column or using the
service brake pedal.
To use the transmission retarder, it must be
activated first by pressing one of the two
Retarder/Engine Brake buttons on the steering
wheel.
Operating The Retarder Using The Hand Lever
With the retarder enabled and the accelerator pedal
released, move the output retarder lever clockwise
from the first to the sixth position. The braking effect
occurs as soon as the accelerator pedal is released.
The braking level for each position is as follows:
RETARDER HAND LEVER
Position Braking level (up to)
(0) Initial
Varies with brake pedal position. No
effect upon release of the accelerator
pedal.
(1)
16%
(2) 33%
(3) 49%
(4) 71%
(5) 89%
(6) 100%
NOTE
The output retarder lever is located on the right side
of the steering column.
Operating The Retarder Using The Brake Pedal
With the retarder enabled, the accelerator pedal
released and the output retarder lever in the initial
position (0), depressing the brake pedal will engage
both the service brake and the transmission retarder.
This is referred to as retarder-brake blending. The
further the pedal is depressed, the more total braking
power is provided. Refer to "TRANSMISSION
RETARDER" on page25 for further information
about the transmission retarder.
NOTE
If the wheels start to lock up on slippery roads, the
output retarder will automatically deactivate until
the wheels start to turn.
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