Gorman-Rupp Pumps S4B1-E50 460/3 1396095 and up - Manual (Page 44)

S SERIES PUMPS OM-06099
MAINTENANCE AND REPAIR PAGE E - 18
Refer to PUMP END REASSEMBLY, and reas­
semble the pump end components.
Terminal Housing And Power Cable
Reassembly And Installation
(Figure E-2)
The electrical power used to operate
this pump is high enough to cause inju­
ry or death. Make certain that the control
handle on the control box is in the OFF
position and locked out, or that the pow­
er supply to the control box has been
otherwise cut off and locked out, before
attempting to open or service the pump
assembly. Tag electrical circuits to pre­
vent accidental startup. Obtain the ser­
vices of a qualified electrician, and refer
to the wiring diagram(s) in INSTALLA­
TION, Section B, to make electrical con­
nections.
Clean the exterior of the power cable with warm
water and mild detergent. Check for obvious physi­
cal damage. Check the cable for continuity and in­
sulation resistance (see Electrical Testing in
TROUBLESHOOTING). Do not attempt repairs
except to cut off either end of the cable; splicing is
not recommended. Reinstall any wire tags or ter­
minals which may have been removed.
Never attempt to alter the length or re­
pair any power cable with a splice. The
pump motor and cable must be com­
pletely waterproof. Injury or death may
result from alterations.
Use oil to lightly lubricate the outside of the pump
power cable (2), and the bores of the terminal
housing (8), terminal gland (1) and gland bushing
(6) for ease of assembly. Slide the terminal gland,
cable grip (3), gland bushing (6), terminal washer
(7) and terminal housing (8) on the cable, allowing
approximately 3 ft. (1 m) of cable to extend beyond
the terminal housing. Temporarily tape the green
and yellow ground wires to the cable.
Sealing Terminal Housing Connections
With Silicone Adhesive
(Figure E-2)
Do not attempt to operate this pump un­
less the power cable leads are properly
sealed in the terminal housing. Mois­
ture entering the terminal housing
could cause a short circuit, resulting in
pump damage and possible serious in­
jury or death to personnel.
When shipped from the factory, the cable leads
and terminal collars (12) were encapsulated in
heat‐shrink tubing (10), and bonded to the terminal
plate (13) with silicone adhesive to provide a water‐
tight seal. If this insulating material has been dam­
aged or removed during maintenance, it must be
replaced using materials and equipment approved
by Gorman‐Rupp (see the parts list for repair kits).
NOTE
Heat‐shrink tubing must be used to seal the power
and control cable leads to the terminals before
bonding the leads to the terminal plate. If silicone
adhesive is not available in the field, a commercially
available potting kit may be used to bond the con­
nections to the terminal plate. If this alternate seal­
ing method is used, refer to the instructions in Seal­
ing Terminal Plate Connections With Potting
Compound. Use only materials and heating equip­
ment approved by Gorman‐Rupp for field repairs.
Before resealing the power and control cables, re­
move all the old adhesive material (or potting com­
pound) from the leads, terminal collars, and termi­
nal plate. Inspect all parts for damage, and replace
as required. If the rubber bonding material on the
terminal plate (13) is severely worn or cracked, the
terminal plate must be replaced. If the bonding ma­
terial has been noticeably compressed, it should
be supplemented with two gaskets contained in
the overhaul gasket kit (see Options listed in the
Parts List manual).