Pneumatic System 325
Connect a multimeter set to the red and black wires of the air pressure switch and select “Continuity”
on the multimeter. Using the 3/32” Allen key, adjust the needle in until the multimeter shows
continuity between the red and black wires. Remove the multimeter and air pressure regulator, then
connect the air pressure switch wires and re-assemble the pneumatic valve box.
NOTE: If your EXPERT™ unit is equipped with an electro-hydraulic valve — hence no pneumatic valve
box on the truck — the signal of this pressure switch is bypassed.
Air Tanks
To drain the air tanks, apply the following procedure:
1. Locate the drain valves on the air tanks (see Figure 7-6).
NOTE: Some trucks are equipped with more than one drain valve.
2. Open the valves by turning them one-quarter turn clockwise.
IMPORTANT: Before opening the valves, be sure to stay away from the stream.
3. Leave the valves open until moisture is removed.
4. When all moisture has been drawn out, close the valves by turning them one-quarter turn
counter-clockwise.
Figure 7-6
Drain valves
Caution
The operator must wear safety glasses to protect his eyes against dust and suspended
matters. The operator must also stay away from the stream to avoid potential injuries.
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