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GB
SERVICE PROCEDURES
Continued
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see page 7).
2. Remove lter end cover screws using5/16” nut-driver.
3. Remove lter end cover and air lters.
4.Remove pump plate screws using 5/16”nut-driver.
5. Remove pump plate.
6. Remove rotor, insert, and blades.
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 25).
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 lters and lter end cover.
11.Replace fan guard and upper shell.
12.Adjust pump pressure (see page 8).
Note: If rotor is still binding, proceed asfollows.
13.Perform steps 1 through 6 above.
14.Place ne grade sandpaper (600 grit) on at surface. Sand
rotor lightly in “ gure 8” motion four times (see Figure 26)
15.Reinstall insert and rotor.
16.Perform steps 10 through 12 above.
A.
B.
C.
D.
E.
F.
G.
H.
SERVICE PROCEDURES
A.
B.
C.
A.
A. gap adjusting
screw
B. .076/.101 mm
(.003”/.004”) Gap
Measured With
Feeler Gauge
C. Blade
Figure 25 – Gap adjusting screw locations.
A.
A. sandpaper
Figure 26 – Sanding rotor.
A.Blade, B.Pump plate, C.Air intake lter, D.Filter end cover,
E.Fan guard, F.Air output lter, G.Rotor, H.Insert.
Figure 23 – Rotor location, 35.000 btu/Hr and 70.000 Btu/
Hr.
A.
B.
C.
D.
E.
F.
G.
H.
Figure 24 – Rotor location, 100.000 Btu/Hr.
A.Blade, B.Pump plate, C.Air intake lter, D.Filter end cover,
E.Fan guard, F.Air output lter, G.Rotor, H.Insert.
30


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