AIR N ARC
®
300 SERIES ALL-IN-ONE POWER SYSTEM
®
SECTION 6: MAINTENANCE
090034-OP_r0
PAGE - 93
KEY
DESCRIPTION
A
PRESSURE SWITCH
B
COMPRESSOR CUT-IN PRESSURE ADJUSTMENT SCREW
Figure 6-15: Pressure Switch Adjustment for Cut-in / Cut-out Pressure Settings
B
A
The
Cut-out pressure
is defined as the pressure in
which the compressor stops pumping. When the
pressure in the air tank rises above this pressure the
compressor is signaled to stop pumping.
Pressure settings for both the minimum and maximum
rated capacity levels for this machine are adjusted at the
factory before shipping, and should not need to be
adjusted. However, a situation may occur where it is
necessary to manually adjust or reset either or both of
these settings. For such cases, consult
Figure 6-15
, and
the following procedure:
1. Locate the air pressure control switch [
A
] at
the rear-side of the generator support
bracket. Remove the cover-retaining screw
fastening the cover to the switch, and
remove the cover.
2. To adjust the compressor pressure, turn the
cut-in pressure adjustment screw [
B
]
clockwise to increase the pressure and
counterclockwise to lessen the pressure.
TOOLS NEEDED
REPLACEMENT
PART(S)
Screwdriver
Not Applicable
NOTE
There must be a minim
um of
25 psi
difference between the cut-in and cut-out
pressures for the system to operate
properly.
WARNING
Pressure settings (both minimum and
maximum) are pre-secured within the
rated capacity levels for this machine at
the factory before shipping. However, it
may be necessary to manually adjust.
NEVER adjust the pressures beyond the
recommended or rated capacity
specified for the machine.
