Pneumatic Valve Box And Air Valves - Wittke STARLIGHT Maintenance Manual

70 Pneumatic System
Figure 6-8 Speed-Up switch
N : The unit transmission must be in neutral before this Speed-Up switch can be turned on in ON
OTE
or AUTO mode.

Pneumatic Valve Box and Air Valves

Mounted on the exterior front body wall, on the streetside, the pneumatic valve box houses the
solenoid-operated air valves that direct air to the air actuators on the hydraulic valve bank. Power is
required to energize the solenoid so that air can pass to the work section dedicated to that particular
air valve.
: On newer vehicles, the pneumatic valve box may be located on the left-hand side, mid-section
N
OTE
body wall (see Figure 7-28).
Figure 6-9 Pneumatic valve box
Air supply from the chassis air tank passes through the filters then feeds the air valves in the
pneumatic valve box. Except for one valve which is normally open to enable the arm up function, all
valves in the pneumatic valve box are normally closed. Also, all valves are grouped into banks capped