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28 308131
Service
Turbine Alternator Removal and
Replacement
NOTE: Replace turbine bearings after 2000 hours of
operation. See your authorized Graco representative.
1. Prepare the gun for service as instructed on page
22.
2. Remove the power supply from the gun handle as
instructed on page 27.
3. Squeeze the two ends of the retaining ring (35)
together and carefully pull the alternator (37) away
from the power supply (18) until the 3-wire connec-
tor (F) disengages. See Fig. 18, page 27.
4. Use an ohmmeter to test the turbine alternator coil.
Measure the resistance between the two outer
terminals of the 3-wire connector (F). The resist-
ance should be 3 to 5 ohms. If the reading varies
from this value, replace the alternator.
5. Measure the resistance between each outer
terminal of the 3-wire connector and the turbine
alternator housing. The resistance should be
infinite. If the resistance is not infinite, replace the
alternator.
6. Connect the 3-wire connector to the 3 prongs in
the power supply. Push the alternator (37) onto the
power supply (18) until the retaining ring (35)
engages with the alternator.
7. Install the power supply in the gun handle as
described on page 27.
Barrel Installation
1. Be sure the gaskets (34 & 18a) and spring (30) are
in place. See Fig. 13. Replace if damaged.
2. Place the barrel (3) over the power supply (18) and
onto the gun handle (7). Make sure the fluid rod
spring (30) is seated properly.
3. Tighten the three socket head cap screws (5)
oppositely and evenly to 18 in-lbs (2 NSm) maxi-
mum (about a half turn past snug) with the wrench
(63) supplied.
CAUTION
To avoid damaging the gun, do not over-tighten the
cap screws (5).
4. Assemble the fluid tube (12) back into the fluid
fitting (16).
5. Test the gun resistance as instructed on page 20.
Fig. 19
0381
Tighten to 18 in-lbs (2 NSm) maximum (about half turn past
snug), using wrench provided.
3
34
30
18
5
7
14
18a
12
16