Impeller Installation - Generac Power Systems MAGNUM MTP4SZ Owner's Manual

Impeller Installation

In all models, the distance between the tip of the impeller
blades and the surface of the wear plate must be between
0.020-0.028 in. (0.508-0.711 mm). To achieve this value,
move the wear plate away from the impeller by turning the
adjustment bushings, once you have calculated "C" as
described below.
C = (B-A+R)
A = Distance between impeller blades and machined
surface of the casing.
B = Distance between wear plate and machined surface
of the cover plate.
Owner's Manual for Wet-Prime Trash Pumps
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5
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Figure 4-9. Impeller Position
1. Volute
3. Adjustment bushing
5. Cover plate
R = Distance between impeller blades and wear plate
0.020-0.028 in. (0.508-0.711 mm).
• Tighten the adjustment bushings to move the
cover away from the casing
• Be sure all four adjustment bushings are adjusted
evenly.
• After adjusting, be sure the shaft and impeller
rotate freely.
NOTE: Turning the adjustment bushing one flat (1/6 turn)
equals 0.015 in. (0.381 mm) of axial distance.
B
2
C
3
01659
2. Wear plate
4. Impeller
Maintenance
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