Gorman-Rupp Pumps S4B1-E50 460/3 1396095 and up - Manual (Page 47)

OM-06099 S SERIES PUMPS
PAGE E - 21 MAINTENANCE AND REPAIR
When potting has been completed, leave the ter­
minal plate assembly undisturbed until the potting
material has cured. Complete curing usually takes
about 24 hours. Curing time can be shortened by
using a heat lamp, but be careful not to melt the
potting or potting mold, or burn the cable. When
the potting material is no longer “tacky” to the
touch, it has cured.
Terminal Housing Installation
(Figure E-2)
After the terminal plate has been sealed, slide the
terminal housing down the cable. Untape the
ground lead(s) and secure them to the terminal
housing with the hardware (18 and 19). Be sure
the lead(s) make good contact with the housing.
Pull gently on the cable to remove any excess
length from within the terminal housing. The termi­
nal plate should fit loosely against the terminal
housing.
Lubricate the upper bore of the terminal housing,
and slide the gland washer (7), bushing (6) and
cable grip (3) into place. Slide the terminal gland
(1) into place and install the nuts (5). Do not fully
tighten the nuts at this time.
Attach the appropriate motor lead (T1, T2, T3) to
each terminal post (14) using the allen head set­
screws (15).
Position the terminal housing and terminal plate
against the upper motor housing. If required, ro­
tate the terminal housing and twist the motor leads
to remove excess slack.
(Figure E-1)
Coat the threads of the motor housing studs (35)
with `Never‐Seez' or equivalent compound, and
secure the terminal housing assembly to the motor
housing with the hardware (36); torque the nuts
evenly in a cross sequence to 20 ft. lbs. (240 in. lbs.
or 2,8 m. kg.). Tighten the nuts (5, Figure E-2)
drawing the terminal gland (1) down into the termi­
nal bore to the dimenstion shown in Figure E-2.
Do not overtighten and damage the terminal gland
or hardware.
NOTE
A .09 to .15 in. (3,05 mm) gap is required between
the terminal gland flange and the terminal housing
when the nuts (5, Figure E-2) are fully tightened.
See FINAL ASSEMBLY and VACUUM TESTING
followed by LUBRICATION.
FINAL ASSEMBLY
(Figure E-1)
If the discharge flange (27) was removed from the
motor housing, replace the discharge flange gas­
ket (26). Apply `Never‐Seez' or equivalent com­
pound on the flange studs (28), and secure the
flange with the nuts (29).
If the hoisting bail (24) was removed, install the bail
bushings (25) and secure the bail to the motor
housing with the hardware (21, 22 and 23).
VACUUM TESTING
To ensure the water‐tight integrity of the pump, it is
recommended that the motor and seal cavities be
vacuum tested any time the seal(s) and/or motor
are serviced.
Drain all of the oil from both the seal and motor
cavities before performing the test. Oil within the
cavities will be drawn into the system, resulting in
damage to the vacuum pump or manometer.
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.
Install full‐closing ball‐type shutoff valves with
quick‐disconnect fittings in the pipe plug holes in