Gorman-Rupp Pumps S8A1-E95 575/3 1429751 and up - Manual (Page 41)

OM-06258 S SERIES PUMPS
PAGE E - 15 MAINTENANCE AND REPAIR
tation is rough or the bearing balls discolored, re­
place the bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the motor
housing and intermediate bore. Replace the shaft
and rotor (as an assembly), the motor housing, or
intermediate if the proper bearing fit is not
achieved.
The lower bearing (39) is secured to the shaft by a
tight press fit. Install two 3/8-16 UNC x 6-inch
long capscrews (not supplied) 180
_ apart in the
tapped holes in the bearing cap (40). Use a bear­
ing puller in conjunction with the capscrews to re­
move the lower bearing and bearing cap as an as­
sembly.
Separate the bearing cap and gasket (41) from the
lower ball bearing.
If replacement is required, use a bearing puller to
remove the upper ball bearing from the rotor shaft.
Stator Removal
(Figure E-1)
Do not remove the stator (22) unless it is defective
(open windings, insulation resistance low, or stator
core damaged). If the stator must be removed, re­
move the terminal housing as indicated in Termi­
nal Housing And Power Cable Disassembly.
Position an expandable tool, such as a split disc,
approximately 2 inches (51 mm) inside the stator,
and expand it tightly and squarely on the I.D. At­
tach a lifting device to the lifting eye of the tool, and
raise the assembly approximately 1 inch (25 mm)
off the work surface.
The motor housing (20) must be heated with a
torch to expand it enough for the stator to be re­
moved. Apply heat evenly to the outside of the mo­
tor housing; excessive heat is not required. Use a
soft‐faced mallet to rap alternate edges of the mo­
tor housing, and “walk” the stator out. Continue
this process until the stator clears the motor hous­
ing.
Take care not to damage the stator end
turns during removal from the motor hous­
ing.
After the stator has been removed, wrap it in clean,
dry rags or other suitable material until reassembly.
The stator must be kept clean and dry. When han­
dling the stator, do not set it on the end windings;
lay it on its side.
Do not attempt to rewind the stator. Wind­
ing tolerances and materials are closely
controlled by the manufacturer, and any
deviation can cause damage or operating
problems. Replace the stator, or return it to
one of The Gorman‐Rupp Authorized Sub­
mersible Repair Centers or The Gorman‐
Rupp factory, if defective.
Relief Valve
(Figure E-1)
It is recommended that the relief valve assembly
(29) be replaced at each overhaul, or at any time
the pump motor overheats and activates the valve.
Never replace this valve with a substitute which has
not been specified or provided by the Gorman‐
Rupp Company.
It is not necessary to remove the heavy pipe nipple
(30) to remove the pressure relief valve. If the nip­
ple is removed, apply `Loctite Retaining Com­
pound No. 680 or No. 620' or equivalent com­
pound on both ends of the nipple only.
When installing the relief valve, use `Loctite Pipe
Sealant With Teflon No. 592' or equivalent com­
pound on the threads. Position the valve out of the
way, next to the terminal housing (16, Figure E-2)
so that there is enough room for the terminal hous­
ing to clear.
Hoisting Bail
(Figure E-1)
If the hoisting bail (65) requires replacement, re­
move the hardware (62, 63 and 64) securing the