Gorman-Rupp Pumps S8B1-E100 460/3 1432260 and up - Manual (Page 45)

OM-06259 S SERIES PUMPS
PAGE E - 19 MAINTENANCE AND REPAIR
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 (2) were encapsulated in heat‐
shrink tubing (3), and bonded to the terminal plate
(19) with silicone adhesive to provide a water‐tight
seal. If this insulating material has been damaged
or removed during maintenance, it must be re­
placed using materials and equipment approved
by Gorman‐Rupp (see the Parts List Manual for re­
pair 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 (19) 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).
NOTE
Clean the cable leads and terminal plate in the ar­
eas to be sealed with cleaning solvent. Incomplete
sealing will occur if the surfaces are dirt, oil or
grease coated.
Assemble the terminal posts (1), dyna seal wash­
ers (20), and terminal collars (2) to the terminal
plate as shown in Figure E-2.
NOTE
Both the power cable and motor conductor leads
should be tinned prior to reassembly.
Slide a length of heat‐shrink tubing (3) up over
each of the power cable leads. Insert the leads in
the terminal collars and secure them using the al­
len head setscrews (18). Slide the tubing down
each lead until the terminals are covered and the
tubing contacts the terminal plate. The tubing
must extend up the leads far enough to ensure a
good seal.
Carefully heat each tube with a commercially avail­
able hot air gun capable of producing 750
_F
(399
_C), and shrink the tubes around the cable
leads and terminal collars.
Use only Dow‐Corning 737 Silicone Adhe­
sive (see the Parts List Manual for the part
number) or potting compound for sealing
terminal housing connections. Use of un­
approved sealing products will void the
pump warranty.
NOTE
Do not use a mold or reservoir with the silicone
adhesive.
Silicone Sealant
Figure E-5. Silicone Adhesive Sealing
See Figure E-6 and check terminal locations. Ap­
ply a 1/4 to 3/8 in. (6,4 to 9,7 mm) thick layer (maxi­
mum) of silicone adhesive around each of the ter­