Service procedures, Continued – Desa H.S.I. User Manual

Page 10

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112846-01A

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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).

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