John Deere AC-70 - Manual (Page 24)

Service
24 Operator’s Manual
MAINTENANCE (CONTINUED):
PUMP ROTOR: (Procedure if Rotor is Binding)
1. Remove upper shell (See "Maintenance: Upper Shell
Removal").
2. Remove filter end cover screws using 5/16" nut driver
(Fig. 21 or 22).
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 (Fig. 21 or 22).
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 .076/.101 mm (.003”/.004”)
if needed (Fig. 23).
Note: Rotate rotor one full turn to ensure the gap is
.076/.101 mm (.003"/.004") 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 "Maintenance:
Upper Shell Removal").
12. Adjust pump pressure (see "Maintenance:Pump
Pressure Adjustment").
Note: If rotor is still binding, proceed as follows.
13. Perform steps 1 through 6.
14. Place fine grade sandpaper (600 grit) on flat surface.
Sand rotor lightly in a “figure 8” motion four times (Fig.
24).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12.
IGNITION CONTROL ASSEMBLY:
WARNING: HIGH VOLTAGE!
1. Unplug space heater.
2. Remove side cover screws (4) using 5/16" nut-driver
to expose ignition control assembly.
3. Remove fuse cover (Fig. 25).
4. Remove fuse from fuse clips (see Fig. 25).
5. Replace fuse with fuse of the same type and rating
(GMA-10). Do not substitute a fuse with a higher current
rating.
6. Replace fuse cover (Fig. 25).
7. Replace side cover.
Pump
Plate
Insert
Rotor
Blade
Filter
End
Cover
Air Intake
Filter
Air Output Filter
Insert
Blade
Rotor
Pump Plate
Air
Intake
Filter
Air Output Filter
Filter End Cover
Gap Adjusting Screw
Rotor
Blade
.003”/.004”
(.076-.101 mm)
Gap Measured
With Feeler
Gauge
Gap Adjusting Screw
Sandpaper
Fuse Clips
Fuse
Fuse
Cover
(Fig. 21)
Model: AC-70
Models: AC-115 / 165
(Fig. 22)
(Fig. 23)
(Fig. 24)
(Fig. 25)