Adjusting the alignment of the optical box
.
If the line on the mirror does not accurately bisect the two points, then the optical box has to be realigned.
To realign the optical box, release column by pressing the foot pedal and rotate the optical box and column
until the correct alignment is obtained. Lock column by pressing the foot pedal. Re-check that the
alignment is correct. See Fig. 11.
CHECKING THE HEADLIGHT AIM.
With an assistant sitting on 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 hydro-pneumatic suspension systems,
it may be necessary to have the engine idling. If this is required, ensure that the handbrake has been applied
and the transmission is in neutral or park before starting the engine. To check headlight aim, proceed as
follows:
• Determine the appropriate headlamp beam image and its aim (See Figs 12. 13 and 14).
NOTE: Pre C.1950 headlamp beam images may not conform to either diagrams 12, 13 or 14. In such cases
check that 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 or for headlamps which cannot be checked on dip beam, check that the
main beam headlights are aimed so that the beam image centre is on or slightly below the horizontal 0%
Line If the outline of the hot spot is difficult to determine then move the optical head and observe the
readings on the Luxmeter see Fig. 11, until the highest reading is obtained.
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