Gorman-Rupp Pumps U4B65S-B 1298951 and up - Manual (Page 38)

OM-05667 SUPER U SERIES
MAINTENANCE & REPAIR PAGE E - 14
PRESSURE RELIEF VALVE
MAINTENANCE
(Figure 1)
The back cover is equipped with a pressure relief
valve (32) to provide additional safety for the pump
and operator (refer to Liquid Temperature And
Overheating in OPERATION).
It is recommended that the pressure relief valve as­
sembly be replaced at each overhaul, or any time
the pump overheats and activates the valve. Never
replace this valve with a substitute which has not
been specified or provided by the Gorman‐Rupp
Company.
Periodically, the valve should be removed for in­
spection and cleaning. When reinstalling the relief
valve, apply `Loctite Pipe Sealant With Teflon No.
592', or equivalent compound, on the relief valve
threads. Position the valve as shown in Figure 1
with the discharge port pointing down.
Final Pump Assembly
(Figure 1)
Install the shaft key (17, Figure 2) and reconnect
the power source. Be sure to install any guards
used over the rotating members.
Do not operate the pump without the
guards in place over the rotating parts.
Exposed rotating parts can catch cloth­
ing, fingers, or tools, causing severe in­
jury to personnel.
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.
Remove the fill cover assembly (46) and fill the
pump casing with clean liquid. Reinstall the fill
cover and tighten it. Refer to OPERATION, Section
C, before putting the pump back into service.
LUBRICATION
Seal Assembly
(Figure 2)
Before starting the pump, remove the vented plug
(9) and fill the seal cavity with SAE No. 30 non‐de­
tergent oil. Check the oil level regularly through the
sight gauge (18)
and maintain it at the middle of the
gauge.
NOTE
The white reflector in the sight gauge must be posi­
tioned horizontally to provide proper drainage.
Bearings
(Figure 2)
The bearing housing was fully lubricated when
shipped from the factory. Check the oil level regu­
larly through the sight gauge (18A)
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 (10). Do not over‐lubricate.
Over‐lubrication can cause the bearings to over‐
heat, resulting in premature bearing failure.
NOTE
The white reflector in the sight gauge must be posi­
tioned horizontally to provide proper drainage.
Under normal conditions, drain the bearing hous­
ing once each year and refill with clean oil. Change
the oil more frequently if the pump is operated con­
tinuously or installed in an environment with rapid
temperature change.
Monitor the condition of the bearing lubri­
cant regularly for evidence of rust or mois­
ture condensation. This is especially im­
portant in areas where variable hot and
cold temperatures are common.
For cold weather operation, consult the factory or a
lubricant supplier for the recommended grade of
oil.
Power Source
Consult the literature supplied with the power
source, or contact your local power source repre­
sentative.