Desa 125,000 Btu/Hr Owner's Manual page 15

SERVICE PROCEDURES
Continued
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see Upper Shell Removal, page 9).
2. Remove fan guard.
3. Remove filter end cover screws using 5/16" nut driver (see Fig-
ure 23).
4. Remove filter end cover and air filters.
5. Remove pump plate screws using 5/16" nut-driver.
6. Remove pump plate.
7. Remove rotor, insert, and blades (see Figure 23).
8. Check for debris in pump. If debris is found, blow out with
compressed air.
9. Install insert and rotor.
10. Check gap on rotor. Adjust to .076/.101 mm (.003"/.004") if
needed (see Figure 24).
Note: Rotate rotor one full turn to ensure the gap is .076/.101 mm
(.003"/.004") at tightest position. Adjust if needed.
11. Install blades, pump plate, air filters, and filter end cover.
12. Replace fan guard and upper shell (see Upper Shell Removal,
page 9).
13. Adjust pump pressure (see Pump Pressure Adjustment, page 10).
Note: If rotor is still binding, proceed as follows.
14. Perform steps 1 through 6.
15. Place fine grade sandpaper (600 grit) on flat surface. Sand ro-
tor lightly in "figure 8" motion four times (see Figure 25).
16. Reinstall insert and rotor.
17. Perform steps 10 through 12.
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For more information, visit www.desatech.com
For more information, visit www.desatech.com
SERVICE PROCEDURES
Rotor
Insert
Air Output
Filter
Figure 23 - Rotor Location
Gap Adjusting Screw
Blade
Gap Adjusting Screw
Figure 24 - Gap Adjusting Screw Locations
Sandpaper
Figure 25 - Sanding Rotor
15
15
Blade
Pump Plate
Air Intake
Filter
Filter End
Cover
.003"/.004"
(.076-.101 mm)
Gap Measured
With Feeler
Gauge
Rotor