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Pump Assembly, Standard Spa Pump
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Note that the purpose of this section is to show you how to assemble a
spa pump. While every effort is made to be sure that virtually all areas of complexity are
covered, you may find it more difficult or sometimes easier to accomplish this task. Use
common sense. If the pump assembly or components that you have on your spa are a lot
different from what is depicted here, then do not use these instructions.
Safety Warnings!
| Remove Power from the spa/hot tub BEFORE performing this
procedure. Failure to comply with this requirement, can lead to
electrical shock and/or electrocution! |
Disclaimer
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instructions here are intended for general reference only. Many pumps
are different from the one depicted here, and may require more or less
mechanical effort or knowledge in order to achieve the desired
results. |
READ FIRST BEFORE YOU
CONTINUE
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Pumps and Parts Price Listings:
Complete Pumps,
Wet Ends,
Motors,
Seals,
Impellers,
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In this pump assembly procedure, we are building an
entirely new pump, using a 1.0 HP Emerson motor, and a center discharge Waterway wet
end.
To get things started, first slide the rubber 'water
slinger' away from the front of the pump motor. I always apply Waterlube anti-corrosion
lubricant to the pump shaft, all the way to the bearing. This simple application will save
your pump motor from damage caused by seal failure in the future.
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Apply Waterlube brand anti-corrosion lubricant
liberally around the pump shaft and a little on the threads. Be sure to get as close to the
bearing entrance as possible. This coating will prevent the rusting of the pump shaft in the
event of pump seal failure.
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Since this is a new pump motor, we first have to
remove the retaining nuts from the thru-bolts before we can mount the wet end to it. If you
are only replacing the wet end, then skip this step.
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Next, remove the access cover to the pump shaft.
Other types or brands of motors may have a different back cover to gain access to the armature
shaft. Newer style Emerson with a pop-out plastic cover is shown to the right.
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Franklin Electric
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Magnetek
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These three pictures show how to put the wet end on
the pump motor. Carefully insert the pump shaft into the impeller opening of the wet end
until it bottoms out. Here I'm using my fingers to hold the impeller in place through the
suction opening. Then, using a screwdriver, rotate the armature clockwise to thread the
impeller onto the shaft. It should NEVER require more than finger-tip force to do this. If
you are installing a Franklin Electric pump motor, you will need to use pliers or other suitable
tool to rotate the armature shaft. Remember, this is a very simple procedure, requiring very
little force.
As you tighten the assembly, the impeller will pull
away from the front of the wet end, and "spring-load" the pump seal. It is very
normal to experience an increase in rotational pressure at this point. Simply continue
turning the shaft until it stops. Never try to tighten the impeller more than this. The
normal operation/rotation of the pump motor will always keep the impeller tight.
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Re-install the armature end cover, and tighten the
long through bolts into the wet end. There are 4 bolts to do this with, and it is
recommended to tighten them in an X fashion.
If you have difficulty getting all of them seated, be
sure to only fully tighten them after all four bolts have been at least started into the threads.
The assembly of the pump is now complete.
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