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Gun Repair
312900G 33
Remove and Replace Turbine
Alternator
Replace turbine alternator bearings after 2000 hours
of operation. Order Part No. 223688 Bearing Kit.
1. Prepare gun for repair, page 27.
2. Remove the power supply/alternator assembly,
page 32.
3. Disconnect the alternator from the power supply,
page 32.
4. Measure resistance between the two outer termi-
nals of the 3-wire connector (GG); it should be
2.5-3.5 ohms. If outside this range, replace the alter-
nator coil.
5. Follow the bearing replacement procedure in the
bearing kit manual 308034.
6. Install the alternator on the power supply, page 32.
7. Install the power supply/alternator assembly, page
32.
Repair Fan Air Adjustment Valve
1. Prepare the gun for service, page 27.
2. Place a wrench on the flats of the valve assembly
(20) and unscrew it from the handle (17).
You may replace the valve as an assembly (go to
step 9) or as individual parts (steps 3-9).
3. Remove the retaining ring (20a). See F
IG. 19.
4. Turn the valve stem (20d) counterclockwise until it
comes free from the valve housing (20c).
5. Remove the o-ring (20b).
6. Clean all parts and inspect for wear or damage.
Use non-silicone grease, Part No. 111265. Do not
over-lubricate.
7. When reassembling the fan air valve (20), lightly
lubricate the valve threads and screw the stem (20d)
fully into the housing (20c) until bottomed. Install the
o-ring (20b*), lubricate, and unscrew the valve stem
until the o-ring enters the housing.
8. Reassemble the retaining ring (20a). Unscrew the
valve stem from the housing until it is stopped by the
retaining ring.
9. Screw the valve assembly (20) into the gun handle,
using a wrench on the flats of the housing. Torque to
15-25 in-lb (1.7-2.8 N•m).
Fig. 19. Fan Air Adjustment Valve
TI1487A
20a
20b*
20c
20d