Servicing; Pump Disassembly - Pentair WATERFALL AFP-75 Installation And User Manual

8

SERVICING

This section describes how to service the Waterfall
RISK OF ELECTRICAL AND ELECTROCUTION
This pool pump must be installed by a licensed or certified electrician or a qualified pool serviceman
in accordance with the National Electrical Code and all applicable local codes and ordinances.
Improper installation will create an electrical hazard which could result in death or serious injury to
pool users, installers, or others due to electrical shock, and may also cause damage to property.
Always disconnect power to the pool pump at the circuit breaker before servicing the pump.
Failure to do so could result in death or serious injury to serviceman, pool users or others
due to electric shock.
Read all servicing instructions before working on the pump.
DO NOT open the strainer pot if pump fails to prime or if pump has been operating without water in
the strainer pot. Pumps operated in these circumstances may experience a build up of vapor pressure
and may contain scalding hot water. Opening the pump may cause serious personal injury. In order
to avoid the possibility of personal injury, make sure the suction and discharge valves are open and
strainer pot temperature is cool to touch, then open with extreme caution.
Be sure not to scratch or mar the polished shaft seal faces; seal will leak if faces are damaged.

Pump Disassembly

All moving parts are located in the rear sub-assembly of this pump. Refer to Figure 5 on page 10 for an illustrated
parts view.
Tools required:
• 1/4-inch Flat Blade Screwdriver
• 3/8-inch or 1/2-inch Flat Blade Screwdriver
• 9/16-inch Open End Wrench
• Rubber Mallet
• Adjustable Wrench or Locking Pliers
To remove and repair the motor sub-assembly perform the following procedures:
1. Turn off the pump circuit breaker at the main panel. Close suction and discharge valves to relieve system
pressure.
2. Drain the pump by removing the drain plugs. The drain plugs can be removed by hand. No tools are needed.
3. Loosen the band clamp by turning the band clamp knob counter-clockwise. The band clamp holds the rear sub-
assembly to the housing (strainer pot/volute).
4. Remove the rear sub-assembly from the housing (strainer pot/volute) and place the band clamp to the side.
Note: If the band clamp does not separate from the pump housing and seal plate when loose, lightly tap the top of
the band clamp with a rubber mallet. This will free the clamp from the housing.
5. Place the rear sub-assembly upright and on a flat surface. Use a flat blade screwdriver to remove the three (3)
holding screws located on the diffuser.
6. Remove the diffuser and diffuser spacer from the rear sub-assembly.
7. Use a flat blade screwdriver to remove the impeller screw located in the center of the pump's impeller.
Note: The impeller screw is a left-handed thread and loosens in a clockwise direction.
8. Use the 3/8-inch or 1/2-inch flat blade screwdriver to hold the motor shaft in place. The motor shaft is accessible
through the back of the motor.
Note: If the torque is too high to hold the screwdriver by hand then an adjustable wrench may be used to hold the
screwdriver shaft in place. Use locking pliers instead if your screwdriver has a round shaft.
WATERFALL™ Specialty Pump Installation and User's Guide
Specialty Pump.
™