Sealey HBS97 - Manual (Page 2)

CORRECT LIGHT PROJECTION ON THE LINE 0.5% (BEAM LIGHT)
fig 7
7. GRADUATED SCREEN
IMPORTANT
The HBS system uses a fixed graduated
screen in accordance with the requirements
of the MOT regulations.
8. DIPPED BEAM
8. 1. Prepare the HBS and the car as previously instructed, then turn on the dipped beam.
8. 2. Check the headlamp beam tolerances are in accordance with MOT inspection manual, and are within operating tolerances
of manufacturer’s guidelines.
8. 3. Adjust the vehicles light regulating system until you obtain the required result.
8. 4. When testing the more commonly used asymmetrical headlight (see fig 7), remember that their projection will light up a section
on the LEFT hand side of the plate with a corner of about 15 0 from the horizontal plane. Just under the centre, on the right, a small
zone will appear brighter than the rest of the projection.
6. 1. Switch engine on.
6. 2
Align the headlamp aim equipment with the longitudinal axis of the vehicle.
6. 3. Align the centre of the collecting lens with the centre of the headlamp under test.
6. 4. With an assistant sitting in the driving seat, switch on the headlamps to the beam on which the headlamp is to be checked.
Note: When checking headlamp aim on vehicles with hydropneumatic suspension systems, it is necessary to have the engine idling.
6. 5. Determine the appropriate headlamp beam image and its aim (see fig 7.). Old vehicles (approx. pre 1950 ) headlamps beam image
may not conform to fig 7, in such cases check::
a) DIP BEAM headlamps are aimed so they do not dazzle i.e. the beam image brightest part is aimed at least 0.5% below
the horizontal (fig 8). Or, for headlamps which cannot be checked on dip beam, check:
b) MAIN BEAM headlamps are aimed so that the beam image centre is on or slightly below the horizontal (fig 9).
5.1. Positioning.
Conventional, Double Ellipsoid (DE) Headlamps
Locate the HBS approximately 200 to 500mm from the vehicle headlamp.
Gas Discharge (Xenon) and Free Form (FF) Headlamps
Locate the HBS as close to the headlamp lens as possible. Close
proximity between the lens and the HBS gives a more defined
light/dark margin on the aiming screen enabling accurate alignment.
5. 1. 1 Use the visor to align with a horizontal, or two symmetrical points on
the vehicle (fig.5) i.e. The bonnet lip or the bottom of the windscreen.
5. 1. 2. Ensure the visor lines match with your horizontal, or symmetrical
selection, to ensure the HBS is parallel to the headlamp.
5. 1. 3. Measure the height from the floor to the centre of the headlight e.g.
80cm. Release the HBS unit by squeezing the lower lever upwards
as shown in fig.4. Slide the unit up or down the column as required
until the top surface of the sliding portion is aligned with 80 on the
scale printed on the column as shown in fig.4A. Release the locking
lever. There is a tolerance level of 30mm.
5. 2. HBS Column Rotation Lock.
The HBS system is fitted with a rotating column and is suitable for
use either on or off rails. If you are using the system on rails then
the rotating column aids correct alignment. To release the column
lock put pressure on the foot pedal in an anticlockwise direction as
shown in fig6A. To re-lock the column put pressure on the foot pedal
in a clockwise direction as shown in fig6B.
fig.4
fig.5
5. OPTICAL POSITIONING
6. METHOD OF INSPECTION
fig.6A fig.6B
HBS97.V2, HBS971 - 2 - 290806