Gorman-Rupp Pumps 62 1/2A1-L100 S/G S2 93740 CA and up - Manual (Page 25)

OM−06224 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 Yanmar engine representative.