PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see Upper Shell
Removal, page 9).
2. Remove filter end cover screws using
5/16" nut driver (see Figure 17).
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 (see
Figure 18).
7. Check for debris in pump. If debris is
found, blow out with compressed air.
8. Install insert and rotor.
9. C h e c k g a p o n r o t o r. A d j u s t t o
0.076/0.101 mm (0.003"/0.004") if needed
(see Figure 18).
Note: Rotate rotor one full turn to ensure
the gap is 0.076/0.101 mm (0.003"/0.004")
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 Pres-
sure Adjustment, page 11).
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"
motion four times (see Figure 19).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12.
14
SERVICE PROCEDURES
www.usaprocom.com
Blade
Insert Rotor
Pump
Plate
Figure 17 - Rotor Location
Gap Adjusting Screw
Blade
Gap Adjusting Screw
Figure 18 - Gap Adjusting Screw
Locations
Sandpaper
Figure 19 - Sanding Rotor
Air
Intake
Pump
Filter
Cover
Filter
End
Cover
Air Output Filter
0.003"/0.004"
(0.076-0.101 mm)
Gap Measured
With Feeler
Gauge
Rotor
160930-01A