Hofmann Pro42, Operator'S Manual

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Page 3-31
Chapter III Operation
The Aligner prompts you where to stop, depending on
which measurements you want. For example to mea-
sure caster only, move the wheels from one caster posi-
tion to the other caster position, and then return to the
center steering position. To measure caster
and
TOOT
move the wheels from the caster position to the TOOT
position, then to the other caster and TOOT position,
and then return to the center steering position.
During steering measurements, the Aligner may briefly
lose track of one or more wheel target. When this oc-
curs, wheels displayed on the lower-left and lower-right
will indicate a red X to indicate the lost wheel targets.
When the front wheel targets are lost, stop steering
rotation until the aligner finds the lost targets.
Wheel Roll Message
If the aligner detects excessive wheel roll during the
steering angle measurements, an error message ap-
pears. We recommend restarting the steering mea-
surements if this occurs. Select OK and the software
begins a new steering angle measurement sequence.
Wheel roll can usually be corrected by firmly install -
ing the brake pedal depressor. On many vehicles it
is necessary to start the engine to enable the power
brakes in order to keep the wheels from rolling.