SERVICE PROCEDURES
Continued
PUMP ROTOR
(Procedure if Rotor is Binding)
1.Remove upper shell (see Upper Shell Re- moval, page 9).
2.Remove filter end cover screws using 5/16" nut driver (see Figure 30 or 31).
3.Remove filter end cover and air filters.
4.Remove pump plate screws using 5/16"
5.Remove pump plate.
6.Remove rotor, insert, and blades (see Figure 30 or 31).
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 (see Figure 32). 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 Upper Shell Removal, page 9).
12.Adjust pump pressure (see Pump Pressure Adjustment, page 10).
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 “figure 8” mo- tion four times (see Figure 33).
15.Reinstall insert and rotor.
16.Perform steps 10 through 12.
Blade
Pump Plate
Air
Intake
Filter
Insert
Rotor
Air Output Filter
Filter End Cover
Figure 31 - Rotor Location, 110/115/155/
165/200 Models
Gap Adjusting Screw
Blade
.003"/.004"
Gap Measured
With Feeler
Gauge
Rotor
Gap Adjusting Screw
Figure 32 - Gap Adjusting Screw Locations
Sandpaper
Figure 33 - Sanding Rotor
Insert
Blade | Air Intake |
| Pump Filter |
| Plate |
Filter
End
Cover
Rotor
Air Output Filter
Figure 30 - Rotor Location, 40/50/55/60/
70 Models
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