Electrical Tests
333011D
23
Test Barrel Resistance
1. Insert a conductive rod (B) into the gun barrel
(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 (33). See F
IGURE
19.
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 (33) are
clean and undamaged.
3. If the resistance is still outside the range, remove
the conductive ring (33) 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 (33) with a new one. Insert the ends of the con-
ductive ring into the slots (S) at the front of the bar-
rel, then press the ring firmly into the groove.
5. If the resistance is still outside the range, replace
the gun barrel.
The conductive ring (33) is a conductive (metal) con-
tact ring, not a sealing o-ring. To reduce the risk of fire,
explosion, or electric shock:
• Do not remove the conductive ring except to
replace it.
• Never operate the gun without the conductive ring
in place.
• Do not replace the conductive ring with anything
but a genuine Graco part.
S
G
F
IG
. 19 Test Gun Barrel Resistance
33
C
B
