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Pump Rotor
(Procedure if rotor is binding)
1. Remove upper shell (see
page 10).
2. Remove filter end cover
screws using 5/16" nut-
driver.
3. Remove filter end cover
and air filters.
4. Remove pump plate
screws using 5/16" nut-
driver.
5. Remove pump plate.
6. Remove rotor, insert, and
blades.
7. Check for debris in pump.
If debris is found, blow
out with compressed air.
8. Install insert and rotor.
9. Check gap on rotor.
Adjust to .003"/.004"
(.076/.101mm) if needed
(see Figure 18).
Note: Rotate rotor one
full turn to insure the gap is
.003"/.004" (.076/.101mm) at
tightest position. Adjust if
needed.
10. Install blades, pump plate,
air filters, and filter end
cover.
11. Replace fan guard and
upper shell.
12. Adjust pump pressure (see
page 11).
Note: If rotor is still binding,
proceed as follows.
13. Perform steps 1 through 6
above.
14. Place fine grade sandpaper
(600 grit) on flat surface.
Sand rotor lightly in
"figure 8" motion four
times (see Figure 19).
15. Reinstall insert and rotor.
16. Perform steps 10 through
12 above.
14
Insert
Rotor
125 ROTOR
Gap Adjusting
Screw
Blade
Gap
Adjusting
Screw
Figure 18 - Gap Adjusting
Screw Locations
Blade
Air
Output
Filter
PFA/P 058
Fan Guard
Figure 17 - Rotor Location
.003"/.004"
(.076/.101mm) Gap
Measured With
Feeler Gauge
Rotor
Pump
Plate
Air
Intake
Filter
Filter End
Cover
Sandpaper
Figure 19 - Sanding Rotor
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