Jacuzzi Z Builder Series Mechanics And Repair page 11

SINGLE SPEED, 2 or MORE PUMP SPAS:
All 3 Styles of 1 Speed Pump 220-240vac Pump/Motors (2500-250 is the single
low speed pump/motor complete. 2500-251 is the K-Pump 3hp pump/motor
complete. 6540-xxx is the 2.5hp, high pressure pump/motor complete.)
All spas that operate on ONLY 220-240vac current are 2 pump systems. Some
also have a circulation pump.
TWO Pump Systems:
The #1 pump will be the standard Jacuzzi 1JP-pump. The secondary or HIGH
pump will be either a second 1JP-pump or depending on the model, a K-Pump.
TWO Pump Spas with Circulation Pump:
If you have a circulation pump, you have TWO High Pressure pumps to drive the
jets. The circulation pump handles the heating and filtering.
Compare the #2 pump with the #1 Pump. If they have an identical face, they are
both 1JPumps. If the #2 pump has the front suction fitting in the middle of the
face rather than a snout, you have a 3hp K-Pump. If your #1 or #2 pump have the
top discharge on the side of the pump rather than the center, you have a high
pressure pump.
Removal:
Turn off main power. Drain the spa. Most Jacuzzi models do not have valves to
close to avoid draining the spa but check yours.
Once the spa is drained, disconnect the 2 couplings attached to the pump (wet
end). Normally you can hand loosen but occasionally you will need to use a large
wrench to loosen. You can also use a oil filter wrench to remove.