Gorman-Rupp Pumps 66B3-B 407277 and up - Manual (Page 30)

OM−01459 60 SERIES
MAINTENANCE & REPAIR PAGE E − 9
peller key (31) in the shaft keyway. Align the key-
way in the impeller with the shaft key and press the
impeller onto the shaft until fully seated.
For maximum pump efficiency, the impeller should
be centered within the volute scroll.
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 or
binding before further reassembly.
With the impeller properlly positioned on the shaft,
install a new O-ring (28) in the groove in the impel-
ler nut (29) and screw the nut onto the shaft until
tight. Secure the impeller nut by installing the hard-
ware (26 and 27) in the tapped hole in the impeller.
Suction Head and Wear Ring Installation
If the wear ring (25) was removed at disassembly,
press the replacement ring into the suction head
(32) until fully seated.
The wear ring must seat squarely in the
suction head bore or binding and/or ex-
cessive wear will result.
Replace the suction head gasket (33). Position the
suction head over the studs (34) and secure the
suction head to the pump casing using the nuts
(35). Make sure the jacking screws (30) do not in-
terfere with the cover plate seating.
Turn the shaft by hand to make sure that the impel-
ler is not binding or scraping.
Final Pump Assembly
Be sure the pump assembly is securely mounted
to the power source and base.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.
Be sure the pump and power source have been
properly lubricated, see LUBRICATION.
Refer to OPERATION, Section C, before putting
the pump back into service.
LUBRICATION
Seal Assembly
The seal assembly is lubricated by the liquid being
pumped. No additional lubrication is required.
Bearings
The pedestal was fully lubricated when shipped
from the factory. Under normal conditions, remove