Jacuzzi Z Builder Series, Mechanics And Repair

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Chapter ONE Pump & Motors
Overview:
There can be confusion; What’s a pump? What’s a motor? Are they the same?
The “ pump ” is considered by many to be the complete pump/motor and by others
only the end where the water passes through. The “wetend” is the more common
word for the end that moves the water.
Jacuzzi’s pump or wetend is patented by Jacuzzi and only sold by them. The
motor is made by others.
Jacuzzi Whirlpool first used their WHITE pump in common production. It’s a one
piece pump that bolts to the motor body by 4 bolts on the pumps gray mounting
plate. If the pump fails, you must replace the complete white pump. They are
NOT interchangeable with the next generation pump.
The “J” PUMP is BLACK and made of the main body or bracket that mounts on
the motor by the 4 bolts that hold the motor together.
Then the impellor which attaches to the motor shaft. When the impellor rotates its
what moves the water. Between the impellor and the bracket is the seal. The seal
is a two part component with ½ in the bracket and ½ on the impellor shaft. When
these two mate they compress and seal the pump from leaking. Then an
“eyeseal” is on the front of the impellor. A large oring seals the front of the pump
(volute) when the bolts tighten them together.
Simply explained, when the impellor turns it compresses the water and the
compressed water escapes out of the top of the pump.
Commonly, the “ motor ” is ONLY the motor, Jacuzzi used either AO Smith or
Emerson motors although earlier they used other brands. Most motors are either
110vac or 220vac although some can be either. If either, you can “field wire” the
motor to match the application you are installing. But typically, it’s a set voltage.
The key for motors is matching the horsepower (hp) of the motor to the pump.