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Gorman-Rupp Pumps 62 1/2A1-GX390 S/2 93740 CA and up User Manual

Page 25

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OM−06223

60 SERIES

MAINTENANCE & REPAIR

PAGE E − 9

For maximum pump efficiency, the impeller should
be centered within the volute scroll. Use the casing
gaskets (10) and the impeller shims (4) to center
the impeller as described below.

To verify the impeller positioning, measure the

pump casing and impeller as shown in Figure 4.
Use these measurements to calculate the required
impeller location (dimension E). Add or remove im-
peller adjusting shims until dimension E is ob-
tained.

D

B
2

A

B

2

C

D

E

Step 2

Step 1

Step 3

A+

B
2

C+

D
2

E

=

Figure 4. Centering Impeller Within Volute Scroll

NOTE

After the impeller has been properly positioned,
check for free rotation. Correct any scraping bind-
ing before further reassembly.

Install the casing gasket set (10). Carefully guide
the wear ring into the eye of the impeller and se-
cure the casing to the intermediate with the hard-
ware (9).

Hand Primer Reassembly

(Figure 1 or 2)

Install the hex head capscrews (25), nuts (26), and

lockwashers (27) securing the hand primer brack-
et to the rollover base. (Figure 2) Connect the hose
connection from the hand primer to the pump
sub−assembly. (Figure 1)

LUBRICATION

Seal Assembly

The shaft seal is lubricated by the liquid being
pumped and no additional lubrication is required.

Engine

Consult the literature supplied with the engine, or
contact your local Honda engine representative.