Desa NOZZLE RJ70, Pump Rotor, Procedure if Rotor is Binding, Service Procedures, Continued

OWNER’S MANUAL

SERVICE

PROCEDURES

Continued

NOZZLE (RJ70)

1.Remove upper shell (see Upper Shell Removal, page 8).

2.Remove fan (see Fan, page 8).

3.Remove fuel and air line hoses from burner head.

4.Remove spark plug wire from spark plug.

5.Remove spark plug from burner head using 13/16" open-end wrench.

6.Remove three screws using 5/16" nut- driver and remove burner head from combustion chamber.

7.Place burner head into vise and lightly tighten.

8.Carefully remove nozzle from burner head using 5/8" socket wrench (see Fig- ure 19).

	Burner Head
Combustion	Spark
Chamber	Plug
	Wire

Screw Spark Plug

Fuel Line Hose

Air Line

Hose

Figure 18 - Removing Burner Head

Nozzle Face

Nozzle Seal

Nozzle

Burner Head

Fuel Line

Fitting

Air Line Fitting

Figure 19 - Removing Nozzle

9.Blow compressed air through face of nozzle. This will free any dirt in nozzle area.

10.Inspect nozzle seal for damage.

11.Replace nozzle into burner head and tighten firmly (14,300-19,600 grams/ centimeter).

12.Attach burner head to combustion chamber.

13.Install spark plug in burner head.

14.Attach spark plug wire to spark plug.

15.Connect and route fuel line hose and air line hose to burner head. See Fuel and Air Line Replacement and Proper Routing, page 10.

16.Replace fan (see Fan, page 8).

17.Replace fan guard and upper shell (see Upper Shell Removal, page 8).

PUMP ROTOR

(Procedure if Rotor is Binding)

1.Remove upper shell (see Upper Shell Removal, page 8).

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 0.08/0.10 mm if needed (see Figure 21). Note: Rotate rotor one full turn to in- sure the gap is 0.08/0.10 mm at tight- est position. Adjust if needed.

Blade

Pump Plate

Air Intake Filter

Filter End

Cover

Insert	Rotor
	Air Output
	Filter
OTOR	PFA/P 056

Fan Guard

Figure 20 - Rotor Location

10.Install blades, pump plate, air filters, and filter end cover.

11.Replace fan guard and upper shell.

12.Adjust pump pressure (see Pump Pres- sure Adjustment, page 8).

Note: If rotor is still binding, proceed as follows.

13.Perform steps 1 through 6, column 1.

14.Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in “figure 8” motion four times (see Figure 22).

15.Reinstall insert and rotor.

16.Perform steps 10 through 12.

Gap Adjusting Screw

Blade

0.08/0.10 mm

Gap Measured

With Feeler

Gauge

Rotor

Gap Adjusting Screw

Figure 21 - Gap Adjusting Screw Locations

Sandpaper

Figure 22 - Sanding Rotor

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