Desa H.S.I. - Manual (Page 10)

112846-01A
10
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PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see Upper Shell Removal, page 7).
2. Remove filter end cover screws using 5/16" nut driver (see Fig-
ure 17).
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 (see Figure 17).
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/.101 mm) if
needed (see Figure 18).
Note: Rotate rotor one full turn to ensure the gap is .003"/.004"
(.076/.101 mm) at tightest position. Adjust if needed.
10. Install blades, pump plate, air filters, and filter end cover.
11. Replace fan guard and upper shell (see Upper Shell Removal,
page 7).
12. Adjust pump pressure (see Pump Pressure Adjustment, page 8).
Note: If rotor is still binding, proceed as follows.
Figure 17 - Rotor Location
Pump Plate
Insert
Rotor
Blade
Filter End
Cover
Air Intake Filter
Air Output Filter
Gap Adjusting Screw
Rotor
Blade
.003"/.004"
(.076-.101 mm)
Gap Measured
With Feeler
Gauge
Gap Adjusting Screw
Figure 18 - Gap Adjusting Screw Locations
FUEL AND AIR LINE REPLACEMENT AND
PROPER ROUTING
1. Remove upper shell (see Upper Shell Removal, page 7).
2. Remove side cover screws using 5/16" nut driver (see Figure
10, page 8).
3. Remove side cover.
4. Inspect fuel and air line hoses for cracks and/or holes. If fuel line
hose is damaged, disconnect from nozzle adapter (see Figure 12,
page 9) and from fuel filter (see Fuel Filter, page 8). If air line
hose is damaged, disconnect from nozzle adapter (see Figure 12,
page 9) and from barb fitting on pump end cover (see Figure 16).
5. Install new air and/or fuel line. Attach one end of air line hose to
barb fitting on pump end cover (see Figure 16) and the other
end to nozzle adapter (see Figure 12, page 9). Attach one end of
fuel line hose to fuel filter (see Fuel Filter, page 8) and the other
end to nozzle adapter (see Figure 12, page 9).
Note: Route hoses as shown in see Figure 12, page 9. Hoses
are not to touch photocell bracket.
6. Replace side cover.
7. Replace upper shell and fan guard (see Upper Shell Removal,
page 7).
Figure 16 - Air Hose to Barb Fitting
Air Hose
Pump End Cover
Barb
Fitting
SERVICE PROCEDURES
Continued
SERVICE PROCEDURES
Figure 15 - Nozzle and Nozzle Adapter
Nozzle
Face
Nozzle
Nozzle Sleeve
Nozzle Adapter
Air Line
Fitting
Fuel Line Fitting
11. Attach fuel and airline hoses to nozzle assembly. See Fuel and
Airline Replacement and Proper Routing.
12. Replace fan (see Fan, page 7).
13. Replace fan guard and upper shell (see Upper Shell Removal,
page 7).