Gorman-Rupp Pumps T4A3-B /F,/FM - Manual (Page 37)

OM-01043 T SERIES
MAINTENANCE & REPAIR PAGE E - 14
Suction Check Valve Installation
(Figure 1)
Inspect the check valve assembly (31), and re­
place it if badly worn.
NOTE
The check valve assembly must be replaced as a
complete unit. Individual parts are not sold sepa­
rately.
Reach through the back cover opening with the
check valve (31), and position the check valve
adaptor in the mounting slot in the suction flange
(27). Align the adaptor with the flange hole, and se­
cure the assembly with the check valve pin (32).
NOTE
If the suction or discharge flanges were removed,
replace the respective gaskets, apply `Permatex
Aviation No. 3 Form‐A‐Gasket' or equivalent com­
pound to the mating surfaces, and secure them to
the pump casing with the attaching hardware.
Back Cover Installation
(Figure 1)
If the wear plate (13) was removed for replace­
ment, carefully center it on the back cover and se­
cure it with the hardware (14 and 15). The wear
plate must be concentric to prevent binding when
the back cover is installed.
Replace the back cover O‐ring (17), and lubricate it
with a generous amount of No. 2 grease. Clean any
scale or debris from the contacting surfaces in the
pump casing that might interfere or prevent a good
seal with the back cover. Slide the back cover as­
sembly into the pump casing. Be sure the wear
plate does not bind against the impeller.
NOTE
To ease future disassembly, apply a film of grease
or `Never‐Seez' on the back cover shoulder, or any
surface which contacts the pump casing. This ac­
tion will reduce rust and scale build‐up.
Secure the back cover assembly by tightening the
hand nuts (18) evenly. Do not over‐tighten the
hand nuts; they should be just tight enough to en­
sure a good seal at the back cover shoulder. Be
sure the wear plate does not bind against the cas­
ing.
PRESSURE RELIEF VALVE
MAINTENANCE
(Figure 1)
The back cover is equipped with a pressure relief
valve (24) 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 (37) and fill the
pump casing with clean liquid. Reinstall the fill