Gorman-Rupp Pumps 54J20-B 1410811 and up User Manual

Page 32

50 SERIES

OM-01342

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 same thickness of impeller

shims (44) as previously 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.

B
2

Step 2

Step 1

Step 3

A+

B
2

C+

D
2

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

Seal Assembly

Fill the seal bottle oiler (14) with SAE No. 30 non‐
detergent oil. Check the oil level regularly and keep
the bottle full.

Bearings

The bearing housing was fully lubricated when
shipped from the factory. Check the oil level regu