Power Supply Removal And Replacement; Power Supply Adjustment - Graco PRO 5500hc Instructions Manual

Power Supply Removal and Replacement

NOTES:
To avoid a loss in electrostatic performance, inspect
the gun body power supply cavity for dirt or mois-
ture. Clean the cavity with a clean, dry rag.
Do not expose the seal (27d) or gasket (27a) to
solvents as this will damage them.
1. Prepare the gun for service as instructed on
page 28.
2. Remove the barrel as instructed on page 34.
3. Grasp the power supply (27) with your hand. With
a gentle side-to-side motion, being careful not to
damage the power supply, pull the power supply
free from the gun body (29), then pull it straight
out. See Fig. 31.
4. Inspect the power supply for any physical damage.
Check the electrical resistance as instructed in
Test Power Supply Resistance, page 27. If
necessary, replace the power supply.
Apply a very light coat of lubricant to the o-ring (25a).
Do not expose the seal (27d) or gasket (27a) to solvents.
26
Fig. 31
Service
5. Before installing the power supply, inspect the seal
(27d) for any damage or swelling; replace the seal
if necessary. Make sure the gaskets and pads
(27a–27e) are in place.
6. Lubricate the o-ring (25a) and insert the power
supply in the gun body.
7. Assemble the gun as instructed in Barrel
Installation, page 36.

Power Supply Adjustment

The kV switch, in the manifold, enables you to switch
between full voltage and a lower voltage output. The
lower voltage is factory set at 60 kV, but can be
adjusted between 45 and 80 kV.
To adjust the low voltage setting, use a small blade
end screw driver to turn the potentiometer (W). Turn it
clockwise to increase the voltage or counterclockwise
to decrease it; fully clockwise is 80 kV, fully counter-
clockwise is 45 kV.
27
27e
27b
W
27a
27d
30
27c
V
25a
25b
25
29
03903A