John Deere AC-70 - Manual (Page 22)

Service
22 Operator’s Manual
IGNITOR:
1. Remove upper shell and fan guard (See "Maintenance:
Upper Shell Removal").
2. Remove fan.
3. Remove 4 side cover screws with a 5/16" nut driver.
Remove side cover (Fig. 12 or 13).
4. Disconnect ignitor wires from ignition control assembly
(Fig. 14). Pull the ignitor wires up through the hole in the
lower shell.
5. Disconnect fuel line hose and air line hose. Remove
photocell from photocell bracket (Fig. 14).
6. Remove combustion chamber. Stand combustion
chamber on end with nozzle adapter bracket on top (Fig.
15).
7. Remove ignitor screw with a 1/4" nut driver. Carefully
remove ignitor from nozzle adapter bracket.
CAUTION: DO NOT BEND OR STRIKE IGNITOR
ELEMENT. HANDLE WITH CARE.
8. Carefully remove replacement ignitor from packing.
9. Carefully guide ignitor into opening in nozzle adapter
bracket. Do not strike ignitor element. Attach ignitor to
nozzle adapter bracket with screw using a 1/4" nut driver
(Fig. 16). Torque .90 to 1.69 N-m (8 to 15 in-lbs) Do not
over torque.
10. Replace combustion chamber.
11. Route the ignitor wires back down through the hole
in the lower shell. Connect wires to the ignition control
assembly (Fig. 15).
12. Replace side cover (Fig. 13 or 14).
13. Connect and route fuel line hose and air line hose
to nozzle adapter assembly. See "Maintenance: Fuel
and Air Line Replacement and Proper Routing".
14. Replace photocell in photocell bracket. Route wires
as shown in either Fig. 16 or Fig. 17.
15. Replace fan.
16. Replace fan guard and upper shell.
Fuel Line Hose
Air Line
Hose
Nozzle/
Adapter
Assembly
Combustion
Chamber
Photocell
Bracket
Nozzle
Adapter
Bracket
Nozzle/
Adapter
Assembly
Combustion
Chamber
Air Line
Hose
Nozzle
Adapter
Bracket
Fuel
Line
Hose
Photocell
Bracket
Photocell
Bracket
Air Line
Hose
Fuel
Line
Hose
Combustion
Chamber
Photocell
Assembly
Ignitor
Nozzle
Adapter
Bracket
Ignition
Control
Assembly
Side Cover
Ignitor
Wire
(Fig. 14)
Photocell
Bracket
Ignitor
Ignitor Screw/
Washer Assembly
Nozzle
Adapter
Bracket
Ignitor
Element
Combustion
Chamber
Nozzle Adapter
Bracket Opening
(Fig. 15)
(Fig. 16)
(Fig. 17)
Model: AC-70
Models: AC-115 / 165
MAINTENANCE (CONTINUED):