Power Supply Removal and Replacement, 40c

SERVICE

KEY		40	40e
F	3-wire Connector	40	40e
G	Potentiometer
10	Gun Barrel		40b
13	Retainer Ring		40b
27	Alternator		G
27a	O-Ring		G
27a	O-Ring
27b	Cushion	40a
39	Gun Body	40a

40Power Supply

40a	Gasket	40c
40b	Pad
40c	Pad
40d	Seal
40e	Cushion	40d

F
	27a
10
27b	27	0450

Fig 23

Power Supply Removal and Replacement

REPAIR NOTES:

a.To avoid a loss in electrostatic performance, inspect the gun handle’s power supply cavity for dirt or moisture. Clean the cavity with a clean, dry rag.

b.Do not expose the seal (40d) or o-ring (27a) to solvents as solvents will damage them.

1.Remove the barrel as described in Barrel Removal.

2.Grasp the power supply (40) with your hand. With a gentle side-to-side motion, being careful not to dam- age the power supply, pull the power supply free from the gun handle (39), then pull it straight out.

3.Inspect the power supply for any physical damage. Check the electrical resistance as instructed in Test Power Supply Resistance. If needed, replace the power supply.

Before installing the power supply, inspect the seal (40d) for any damage or swelling; replace if neces- sary. Also, make sure the gaskets/pads (40a–40e) are in place.

4.Lubricate the o-ring (27a) and insert the power sup- ply in the gun handle.

5.Install the barrel on the handle as described in Barrel Installation.

Power Supply Adjustment

The KV HI/LO switch, on the back of the gun 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 (G), clockwise to increase the voltage or counterclockwise to decrease it; fully clockwise is 80 kV, fully counterclockwise is 45 kV.

Turbine Alternator Removal and

Replacement

NOTE: Replace turbine bearings after 2,000 hours of operation. See your authorized Graco representative.

1.Remove the power supply from the gun handle as described at left.

2.Squeeze the two ends of the retaining ring (13) together and carefully pull the alternator (27) away from the power supply (40) until the wire connector

(F) disengages. See Fig 23 .

3.Use an ohmmeter to test the turbine alternator coil. Measure the resistance between the two outer termi- nals of the 3-wire connector (F). Resistance should be 3 to 5 ohms. If the reading varies from this value, replace the alternator.

4.Connect the 3-wire connector to the 3 prongs in the power supply. Push the alternator (27) onto the pow- er supply (40) until the retaining ring (13) engages with the alternator.

5.Install the power supply in the gun handle as described at left.

308-084 25

308-084, 4600SC, 224-094, 235-894, 235893 specifications

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