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fig.1
4.
OPERATING - CARS AND VANS
4.1
OPERATION
Prior to use, check vehicle manufacturer's recommendations relating to loading. Check that
tyre pressures are correct.
4.1.1 Ensure that the vehicle is on a smooth level surface with the wheels pointing straight
ahead, DO NOT back the vehicle into position.
4.2
Position the laser unit against the offside front wheel (see fig.2) and adjust the height of the
contact bars closest to a horizontal line through the centre of the wheel. At the same time
adjust the side to side positioning of the contact bars so that they touch the sidewall of the
tyre either side of the rim. Position the tips of the contact bars to touch the centre of the
sidewalls at the greatest point of curvature. Avoid any ribs or raised lettering on the tyre side wall.
4.1.3 The contact bars of the mirror unit should now be set up to the same height and width as the laser unit. To do this remove the laser
unit from its position on the tyre and place it in front of the mirror unit to
make the necessary adjustments.
4.1.4 When the contact bar arrangements on both units match, proceed to
calibrate the gauge. (See calibration set-up in figure 3).
4.1.5 Stand both units close together so that the tips of the contact bars are
touching. The mirror unit (fig.3.B) should be vertical, check the built-in
spirit level (fig.1) and adjust using the thumb screw on the arm (fig.1). If
the laser beam is not visible on the target plate loosen the thumb screw on
the arm (fig.1) and tilt the laser unit until the beam is visible on the target
plate (fig.1).
4.1.6 Move the pointer arm (fig.3.C) until the laser beam is visible on the vertical
centre line in between the two bold arrows.
fig.3
fig.2
GA48.V2
Issue no.1 - 24/09/09
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