Graco Inc. 307-712 Paint Sprayer User Manual


 
23
307-712
SERVICE
Turbine Alternator Removal
1. Remove power cartridge from the gun body as
described under Power Cartridge Replacement.
2. Carefully twist the turbine alternator (2a) counterĆ
clockwise and pull it off the power supply (5) until
just disengaged from the coupling. Then continue
to slowly pull the turbine alternator away from the
power supply, disconnecting the 3Ćwire connector
(HH). See Fig 19.
3. Using an ohmmeter, test the coil in the turbine alterĆ
nator (2a). Measure the resistance between the two
outer terminals of the 3Ćwire connector (HH). The
resistance should be 3 to 5 ohms. If the reading varĆ
ies from this value, replace the alternator.
4. Measure the resistance between each outer termiĆ
nal of the 3Ćwire connector (HH) and the turbine alĆ
ternator housing. The resistance should be infinite.
If the resistance is not infinite, replace the alternator.
5. Partially connect the 3Ćwire connector (HH) onto the
prongs inside the power supply (5). See Fig 19. UsĆ
ing a small screwdriver, push the connector onto the
prongs until seated.
6. Slide the turbine alternator (2a) onto the power supĆ
ply, being sure to align the coupling between the
power supply and the turbine alternator housing.
Then twist the turbine alternator clockwise to lock
the coupling.
7. Install the power cartridge in the gun body as
described under Power Cartridge Replacement.
Fig 19
KEY
HH 3-wire Connector
2a Alternator
5 Power  Supply
5
HH
2a
Fan Air Valve Replacement
1. Place a wrench on the flats of the valve housing (55)
and remove it from the gun body (1). See Fig 20.
2. Remove the retaining ring (46).
3. Rotate the air adjusting screw (56) counterclockĆ
wise until it is disengaged from the valve housing
threads. Pull the adjusting screw out of the valve
housing (55).
4. Clean all the parts and inspect them for wear or
damage. If replacing the seal (47), unscrew it clockĆ
wise and remove it from the adjusting screw.
5. Apply medium grade thread sealant to the small
threads on the end of the adjusting screw (56) and
install a new seal (left hand thread).
6. When reassembling the fan air valve, lubricate the
o-ring (54) and the adjusting screw threads with
petroleum jelly.
7. After the retaining ring (46) is installed on the adjustĆ
ing screw (56), back the adjusting screw out of the
valve housing (55) until it bottoms out against the reĆ
taining ring.
8. Apply Teflonr paste to the threads of the valve housĆ
ing (55) and install it in the gun body (1). Torque the
housing to 1.1-1.4 NSm (10-12 in-lb).
Fig 20
KEY
1 Gun Body
46 Retaining Ring
47 Valve Seal
54 OĆRing
55 Valve Housing
56 Adjusting Screw
47 46
56
55
1
54
Apply Teflon paste.
Torque to
1.1-1.4 NSm
(10-12 in-lb)