Gorman-Rupp Pumps SFV3B 1473390 and up - Manual (Page 44)

OM-06400 SF SERIES
PAGE E - 17 MAINTENANCE AND REPAIR
Hoisting Bail Installation
(Figure E-1)
If the hoisting bail (13) was removed in order to re­
move the terminal housing assembly (10) position
the bail over the motor housing so the holes for the
mounting hardware align. Apply “Never‐Seez” or
equivalent compound to the threads of the caps­
crews (8) and secure the bail to the motor housing
with the hardware (8 and 12). Torque the caps­
crews to 28 ft. lbs. (327 in. lbs. or 3,8 m. kg.).
VACUUM TESTING
To ensure the water‐tight integrity of the pump, the
motor and seal cavities must be vacuum tested any
time the seal(s) and/or motor are serviced.
Use a manometer with a range of 30 to 0 to 30 inch­
es of mercury to perform the test. Do not use a vac­
uum gauge. Vacuum gauges are not sensitive
enough to detect minor leaks.
It is recommended that a vacuum pump be used to
draw the vacuum on the cavities. If a vacuum pump
is not available, a compressor/venturi system may
be used. If the compressor/venturi cannot draw
the higher vacuum level shown in Table E-1, draw
the motor cavity vacuum down as far as the system
will allow, then draw the seal cavity down so the dif­
ferential between the two cavities is the same as
the differential between the vacuum readings
shown in the table.
Tee
Manometer
Vacuum Pump
Submersible
Pump
Full-Closing
Ball-Type
Shutoff Valve
Quick Disconnect
Fitting
Quick Disconnect
Fitting
Air Compressor
Venturi
Seal Cavity
Fill/Drain
Motor Vacuum
Test Plate S.O. Valve
Figure E-4. Vacuum Test System
Seal Cavity Testing
If the water‐tight integrity of the motor was not dis­
turbed during disassembly, the seal cavity can be
tested without testing the motor.
Drain all of the oil from the seal cavity before per­
forming the test. Oil within the cavity will be drawn
into the system, resulting in damage to the vacuum
pump or manometer.
See Figure E-4 and connect the vacuum pump or
compressor/venturi system directly to the pump at
the hole for the seal cavity drain plug (7, Figure
E-2).
Draw the seal cavity vacuum down to not more
than 10 In. Hg. and hold for 10 minutes. If no
change in vacuum reading is detected, proceed
with LUBRICATION.
Do not draw the seal cavity vacuum below
10 In. Hg. Lower vacuum can cause sepa­
ration of the seal faces and/or unseating of
the upper seal stationary seat, resulting in
seal leakage.
Seal and Motor Cavity Testing
Connect the vacuum pump or compressor/venturi
system to the pump as shown in Figure E-4.
If the compressor/venturi cannot draw the higher
vacuum level shown in Table E-1, draw the motor
cavity vacuum down as far as the system will allow,
then draw the seal cavity down so the differential
between the two cavities is the same as the differ­