Hofmann Pro42, Operator'S Manual, Page: 50 / 66

Page 3-50
Chapter III Operation
Adjust A-Arms
Many vehicles have adjustment provisions for caster
and camber located on the suspension A-Arm (control
arm), either on the upper or lower arm. The adjustments
may be made with shims, eccentric cams, or slots
in the frame. Both angles are easily corrected to
manufacturer’s specifi cation using the Adjust A-Arm
icon.
First, a screen instructs the operator to apply the brake
pedal depressor (important) and remove the lock pins
from the turntables. Select
OK.
The next screen,
A-Arm Adjust
, allows selection of
the location of the adjustable A-Arm and whether the
corrections will be made on the turntables or elevated.
Examine the vehicle for the location of the adjusters.
It does not matter whether the a-arms have shims,
slots, or cams.
Select to adjust upper A-Arm or Lower A-Arm on the
Adjust A-Arm screen.
The icon looks like that to the left. Selecting switches
from upper to lower and back.
The adjustment screen contains a graphic of the left
and right side a-arm along with two “Slide” meters for
each. These meters represent the movement of the
front and rear of the a-arm, and their relationship to
the desired readings. Move each side of the a-arm
by adding/removing shims, loosening the bolts and
sliding the arm, or turning the eccentric cams, until
each meter indicator is centered in the meter – this is
the desired value for both caster and camber. Press
Next when complete.
Follow any additional instructions if required such as
lower and bouncing the suspension.