Needle / Electrode Resistance Testing; Page Maintenance: (Continued) 27-58 - Ransburg 75785 Service Manual

NEEDLE / ELECTRODE NEEDLE / ELECTRODE
NEEDLE / ELECTRODE NEEDLE / ELECTRODE NEEDLE / ELECTRODE
RESIST RESIST ANCE TESTING ANCE TESTING
RESIST RESISTANCE TESTING RESIST ANCE TESTING ANCE TESTING
The electrical resistance of the needle/electrode
should be tested periodically (typically on a weekly
basis) or any time it is removed from the applicator.
Figure 8: Testing Resistive Electrode Figure 8: Testing Resistive Electrode
Figure 8: Testing Resistive Electrode Figure 8: Testing Resistive Electrode Figure 8: Testing Resistive Electrode
T T T T T o T o T o T est est
o T o Test est est
1. Install the needle/electrode onto the front end of
an available needle shaft. Be sure that the needle/
electrode is completely seated for proper contact
between the metal shaft and the threaded insert of
the needle/electrode.
2. Using a VOM meter that will read 15 megohms
accurately, connect the first meter lead to the
metal needle shaft and the second lead to the
needle/electrode wire.
resistance should be 14.5 to 19 megohms (nominal
15 megohms at 9 volts or 11 to 17 megohms at
1000 volts). Needle/electrodes outside these
ranges must be replaced.
BARREL BARREL ASSEMBL ASSEMBLY Y Y Y Y ASSEMBL
BARREL BARREL ASSEMBL BARREL ASSEMBL
N O T E N O T E N O T E N O T E N O T E
If during pretesting it is found that the
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cascade section of the barrel is bad, repair
of barrel is not an option. The only course
of action is to replace the barrel assembly.
AH-94-04.7
REA-90 and 90L Spray Applicators - Maintenance
The needle/electrode
Removal Removal Removal
Removal Removal
1. While holding the air cap in place with one hand,
loosen the retaining nut using the other hand.
2. Unscrew the retaining nut completely and
remove the air cap.
3. Using a flat head screwdriver, remove the two
shoulder screws that retain the trigger to the
applicator handle.
4. While holding the grounding spring (located
under the trigger and over the air valve stem) back
toward the handle, remove the trigger from the
applicator handle. Remove the grounding spring
from the air valve stem.
5. Using an adjustable wrench, unscrew the fluid
tube connector from the barrel and slide it down
the fluid tube.
6. Use the special multi-purpose wrench to loosen
the retaining nut that secures the barrel to the
applicator handle. After unscrewing the retaining
ring, slide it forward onto the barrel.
7. Hold the applicator handle and fluid tube so the
barrel points downward. With the other hand, pull
the barrel forward to separate it from the handle.
Once the barrel has cleared of the handle, remove
the spring from the spring retainer and set it aside.
If the fluid tube does not come loose from the
barrel, rotate the barrel back and forth on the axis
of the fluid tube until it comes loose.
8. There is no need to remove the retaining ring or
nut from the barrel unless they are damaged. If
they are to be replaced, lift one end of retaining ring
over the captive ridge and spiral it off the end of the
barrel. Then the retaining nut can be removed.
C A U T I O N C A U T I O N
C A U T I O N C A U T I O N C A U T I O N
! ! ! ! !
Use care in removing the retaining ring.
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If it is spread too much it could break.
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