Gorman-Rupp Pumps S8A1-E95 575/3 1429751 and up - Manual (Page 39)

OM-06258 S SERIES PUMPS
PAGE E - 13 MAINTENANCE AND REPAIR
MOTOR DISASSEMBLY
Disassembly of the motor is rarely required except
to replace the motor rotor, stator or bearings. Do
not disassemble the motor unless it is necessary
and a clean, well‐equipped shop is available.
NOTE
It is recommended that a pump with a defective mo­
tor be returned to Gorman‐Rupp, or to one of the
Gorman‐Rupp authorized Submersible Repair
Centers.
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 po­
sition and locked out, or that the power
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 start‐up.
Carefully inspect any O‐rings or gaskets before re­
moval and cleaning to determine if a proper seal
and compression existed prior to disassembly. If
sealing was faulty or questionable, the cause must
be determined and corrected before reassembly.
Replace any parts as required.
Terminal Housing And Power Cable
Removal And Disassembly
(Figure E-1)
Total disassembly of the terminal housing and
power cable (34) is not always required. Disassem­
ble and replace only the parts proven defective by
inspection or testing. See Electrical Testing in
TROUBLESHOOTING.
The terminal housing and power cable assembly
(36) may be serviced without disassembling the
motor housing or pump end or without draining the
oil from the motor cavity. However, the oil must be
drained before attempting to disassemble the mo­
tor housing and components.
Secure the pump in an upright position. Remove
the deform locknuts (36) securing the terminal
housing assembly (34) to the motor housing as­
sembly (20).
(Figure E-2)
Carefully raise the terminal housing (16) from the
motor housing until the terminals (1) are accessi­
ble. Loosen the allen head setscrews (21), and dis­
connect the motor leads from the terminal posts.
Separate the terminal housing and power cable
assembly (13) from the motor housing.
No further disassembly is required to test the stator
or power cable.
To disconnect the power cable (13), remove the
nuts (14) securing the terminal gland (12) to the ter­
minal housing (16). Slide the gland back along the
power cable. Oil the bushing (8) and terminal hous­
ing bore and pull firmly on the cable. (Allow the oil
to leak in around the bushing by agitating the
cable in the bore.) After the bushing has been loos­
ened, the cable should pull out far enough to ex­
pose the bushing. Apply oil on the cable jacket and
slide the bushing back along the cable. Quite of­
ten, pressure exerted on the bushing will deform
the cable jacket. If such happens, additional oil
and effort will be required to remove the bushing.
NOTE
If the rubber bushing cannot be removed from the
terminal housing as indicated, it may be necessary
to cut the bushing into small pieces or cut the cable.
Push approximately 6 inches (152 mm) of the pow­
er cable into the terminal housing so that the termi­
nal plate comes free of the terminal housing. This
should permit access to the power cable connec­
tions in the terminal plate.
NOTE
Do not remove the heat shrink tubing from the pow­
er cable leads unless the power cable or terminals
require replacement. If replacement is required,
the connections between the power cable leads
and the terminals must be sealed with heat shrink
tubing before applying the silicone adhesive (see
Terminal Housing And Power Cable Reassemb­
ly).