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John Deere AC-350 User Manual

Page 22

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Service

Operator’s Manual

NOzzLE:

1. Remove upper shell. (see Mantenance: Upper Shell

Removal).

2. Remove fuel line from solenoid valve using 7/16"

wrench.

. Remove spark plug wire from spark plug.
4. Remove spark plug from burner head using 13/16" open-

end wrench.

5. Remove five screws using 5/16" nut-driver and remove

burner head from combustion chamber.

6. Place burner head into vise and lightly tighten.
7. Carefully remove nozzle from burner head using 5/8"

socket wrench (Fig. 7).

8. Inspect nozzle for damage. If damaged or clogged, replace

nozzle.

9. Make sure plug is in place on burner head.
10. Replace nozzle into burner head and tighten firmly

(17-00 inch-pounds).

11. Attach burner head to combustion chamber.
1. Install spark plug in burner head.
1. Attach spark plug wire to spark plug.
14. Attach fuel line to solenoid valve. Tighten firmly.
1. Replace upper shell.

PUMP PRESSURE ADJUSTMENT:

1. Remove pressure gauge plug from fuel pump port marked

“GAUGE.”

. Install pressure gauge to fuel pump port marked “GAUGE”

(Fig. 8).

. Start heater. Allow motor to reach full speed.
. Adjust pressure. Use small flat blade screwdriver to

turn slotted screw at fuel pump pressure adjusting port.

Turn screw clockwise to increase pressure. Turn screw

counterclockwise to decrease pressure. See specifications

in Figure 8 for correct pressure for each model.

. Stop heater.
6. Remove pressure gauge. Replace pressure gauge plug

in fuel pump port marked “GAUGE.”

PUMP:

(Procedure if Pump is Binding)

1. Remove upper shell (Maintenance: Upper Shell

Removal).

2. Loosen hex screw on flange clamp at rear of motor with

5/16" nut-driver (Fig. 9).

. Turn fan with hand (Fig. 10).
4. If fan turns freely, tighten screw on flange clamp.
. If fan does not turn freely, replace pump.
6. Replace upper shell.

(Fig. 7)

Spark Plug

Burner

Head

Fuel Line

Solenoid Valve

Plug

Nozzle

Spark Plug

Wire

(Fig. 8)

Pump Pressure

100 PSI

Pressure

Gauge

Fuel Pump Port

Marked "GAUGE"

Fuel Pump

Port Marked

"PRESS ADJ"

(Fig. 9)

(Fig. 10)

Hex Screw

On Flange

Clamp