Test Gun Barrel Resistance
1. Insert a conductive rod (B) into the gun barrel
(which was removed for the power supply test)
and against the metal contact (C) in the front of
the barrel.
2. Measure the resistance between the conductive
rod (B) and the conductive ring (9). The
resistance should be 10–30 megohms. If the
resistance is incorrect, make sure the metal
contact (C) in the barrel and the conductive ring
(9) are clean and undamaged.
3. If the resistance is still outside the range,
remove the conductive ring (9) and measure the
resistance between the conductive rod (B) and
the wire lead at the bottom of the conductive ring
groove.
4. If the resistance is in range, replace the
conductive ring (9) with a new one. Insert the
ends of the conductive ring into the slots (S) at
the front of the barrel, then press the ring firmly
into the groove (G).
NOTICE
The conductive ring (9) is a conductive metal
contact ring, not a sealing o-ring. For best
performance and to avoid potential damage to
the spray gun, do not remove the conductive
ring (9) except to replace it and never operate
the gun without the conductive ring in place.
Do not replace the conductive ring with
anything but a genuine Graco part.
5. If the resistance is still outside the range, replace
the gun barrel.
Figure 19 Test Gun Barrel Resistance
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3A2497C
