Gorman-Rupp Pumps 54J2-B 1424552 and up - Manual (Page 32)

50 SERIES OM−01337
MAINTENANCE & REPAIR PAGE E − 10
The wear ring must seat squarely in the
casing bore or binding and/or excessive
wear will result.
Inspect the impeller, and replace it if cracked or
badly worn. Install the seal washer (45). Install the
same thickness of impeller shims (43) as previous-
ly removed and screw the impeller onto the shaft
until tight.
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 5.
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 5. 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.
Replace the cover plate gasket (38). Apply ‘Loctite
Thread Sealant’ or equivalent compound to the
studs (39) and attach the cover plate (41) to the
pump casing using the nuts (40). Make sure the
jacking screws (42) do not interfere 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
Bearings
The bearing housing was fully lubricated when
shipped from the factory. Check the oil level regu-
larly through the sight gauge (28)
and maintain it at
the middle of the gauge. When lubrication is re-
quired, add SAE No. 30 non-detergent
oil through
the hole for the air vent (17). Do not over-lubricate.
Over-lubrication can cause the bearings to over-
heat, resulting in premature bearing failure.