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Electrical Tests
Test Resistor Stud Resistance (continued)
If the resistance is outside the specified range, remove
the resistor stud (22). See Air Cap/Nozzle/Resistor
Stud Replacement on page 22. Check the resistance
between the black resistor stud contact ring (D) and
the needle contact ring (E). Refer to Fig. 10. You may
have to press down on the contact ring (D) in several
places to get a good reading.
The resistance should be 21 to 29 megohms. If the
resistance is correct, make sure the metal contact (C)
in the barrel and the needle contact wire (E) are clean.
If the resistance is outside the specified range, the
resistor is defective and the resistor stud (22) must be
replaced. See Air Cap/Nozzle/Resistor Stud Re-
placement on page 22.
WARNING
FIRE, EXPLOSION, AND
ELECTRIC SHOCK HAZARD
The resistor stud contact ring (D) is a
conductive contact ring, not a sealing
o-ring. See Fig. 10. To reduce the risk of
sparking or electric shock, do not
remove the resistor stud contact ring (D)
or operate the gun without the contact
ring in place. Do not replace the resistor
stud (22) with anything but a genuine
Graco part.
Fig. 10
D
E
0442