Volvo D12, Operator'S Manual

Page: 152 / 214

148 Maintenance
Air System Pressure
Air pressures in the two circuits are moni-
tored by two pressure gauges on the right
side of the instrument panel. The gauge for
the primary (rear) brake circuit is marked
with an “R” within a symbol and the gauge
for the secondary (front) brake circuit is
marked with an “F” within a symbol. The
two pointers should register equal or nearly
equal pressure. By observing the gauge
pointers, the operator is forewarned in the
event of a pressure drop in either or both of
the circuits, and also may readily identify
the specific circuit.
Before operating the vehicle, check the air
gauges which indicate air pressure. They
should not register less than 105 psi
(725 kPa). Maximum pressure at any time
should not exceed 150 psi (1035 kPa).
W3000609
Air Tubing and Hoses
All compressed air tubing and hoses need
regular inspection. Check for signs of wear
and that the routing is not near parts that
can cause damage.
Have any damaged tubing or hoses re-
placed by your local Volvo Truck dealer.
W3000838