Roof Air Deflector, Setting Instructions - Volvo FM Handbook

Roof air deflector, setting instructions

The following requirements must be met to obtain
correct adjustment and effect from the roof spoiler:
• The truck must be parked on a flat surface.
• The tyres must have the correct tyre pressure.
• Trucks with air suspension must have the correct
pressure in the compressed air system.
• The cab hinges must be intact.
• Neither driver or passenger may be inside the cab
during adjustment of settings.
Clarifications
H = difference between H1 and H2.
H1 = height of body. Measurement should be made
from the top of the chassis, or from the ground to the
top of the body.
H2 = cab height. Measurement should be made from
the top of the chassis (compare H1) and to the upper
edge
of the rain gutter on the rear of the cab.
G = distance between the cab rear side (at rain gutter)
and body front side.
A = adjustment stay.
A1 = top hole of stay.
Calculation example
An FM with long low cab has:
H1 = 3700, H2 = 2750
H = H1 – H2 = 950
G = 700
Enter the values in the diagram for an FM with long
low cab and read off. In this case it is field A2.
Therefore use hole A2. If the read-off point
approaches the upper border line of the field, choose
the next field.
External equipment 483
Note!
If any of the values are changed, a
new setting of the spoiler must be
made.