Curtis Dyna-Fog 2742, Manual

Page: 61 / 84

BY PASSING THE AIR PRESSURE SWITCH
PUMP AND CONTROL ASSEMBLY, P/N 64617-R
(RELATIVE LOCATION OF PRESSURE SWITCH)
The air pressure switch is part of the logic of the circuit, allowing the operation of the
formulation pump only if the air nozzle boom pressure is present. With this feature the machine
is not able to pump (spill) the formulation with the engine/blower off (stopped).
Bypassing the pressure switch will enable you (without the machine’s engine running) to
determine if the switch is functioning properly.
To bypass the pressure switch located inside the formulation pump enclosure perform the
following:
1. Remove the orange wire from the terminal “NO3” (normally opened), and remove the piece
of tubing from terminal “NC2” (normally closed). Place the orange wire onto terminal “NC2”.
Doing this will enable the formulation pump to be operated without the machine’s engine
running.
2. Replace orange wire and tubing back into their original positions when finished.
COM
RED WIRE
NO3
AIR PRESSURE
FROM BLOWER
NC2
PIECE OF TUBING
ORANGE
WIRE
PRESSURE SWITCH
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