Gorman-Rupp Pumps SE2D3A 115V 1P 1483930 and up - Manual (Page 35)

OM-06495 SE SERIES
MAINTENANCE & REPAIR PAGE E - 14
NOTE
Check the wiring diagram in Troubleshooting,
Section D to make sure that all electrical leads are
correctly installed.
Position the head (58) on the motor housing (97)
and secure with the hardware (81 and 82).
Secure the cable band (61) to the cable with the
hardware (62 and 63). Secure the cable chain (64)
and carrying handle (57) to the head with the hard­
ware (59 and 60).
See PUMP END REASSEMBLY to reassemble the
pump end components.
See VACUUM TESTING followed by LUBRICA­
TION.
VACUUM/PRESSURE TESTING
To ensure the water‐tight integrity of the pump, it is
recommended that the motor and seal cavities be
vacuum and pressure tested any time the seal and/
or motor are serviced. The seal cavity must be
pressurized to prevent separation of the seal faces
or unseating the stationary seal seat between the
seal and motor cavities. Use a manometer with a
range of 30 to 0 to 30 inches of mercury to perform
the vacuum test. Do not use a vacuum gauge. Vac­
uum gauges are not sensitive enough to detect mi­
nor leaks.
Drain all of the oil from both the seal and motor
cavities before performing the test. Oil within the
motor cavity will be drawn into the system, result­
ing in damage to the vacuum pump or manometer.
It is recommended that a vacuum pump be used to
draw the vacuum on the motor cavity. If a vacuum
pump is not available, a compressor/venturi sys­
tem may be used. If the compressor/venturi cannot
draw the vacuum level shown in Table E‐1, draw
the motor cavity vacuum down as far as the system
will allow, then pressurize the seal cavity so the dif­
ferential between the two cavities is the same as
the differential between the readings shown in the
table.
If a compressor/venturi system is used, install full‐
closing ball‐type shutoff valves with quick‐discon­
nect fittings in the pipe plug holes in both the motor
and seal cavities. This will allow the pressure (or
vacuum) to be maintained while using the com­
pressor to perform the second portion of the test.
Figure E‐3 shows a simple schematic for setting up
either a vacuum pump or a venturi/compressor
test system.
ООО
ООО
Tee
Manometer
Vacuum Pump
Submersible
Pump
Full-Closing
Ball-Type
Shutoff Valve
Quick Disconnect
Fitting
Quick Disconnect
Fitting
Air Compressor
Venturi
Vacuum Test
Motor Cavity
Use Compressor
to Pressure Test
Seal Cavity
Figure E‐3. Vacuum/Pressure Test System
Table E‐1 shows the motor cavity vacuum and seal
cavity pressure readings for the test, and the dura­
tion to maintain each reading. Any change in the readings during the test indicates a leak which
must be identified and corrected before putting the
pump back into service.