Pump Service; Troubleshooting Checklist - Pentair MYERS MSP7 Owner's Manual

PUMP SERVICE

CAUTION: Always turn power off and drain the pump before
servicing. If pump is below the water level of the pool, close
shut-off valve on both suction and discharge lines.
Step 1: Disconnect the power and remove drain plugs.
Step 2: Remove strainer lid; let drain.
Step 3: Disconnect piping.
Step 4: Remove clamp by turning tee handle.
CAUTION: Be sure pump is drained and pressure has been
released before removing clamp.
Step 5: Remove the case.
Step 6: Remove the impeller by turning counterclockwise. The
best way to remove impeller is by inserting a screwdriver in the
blade area and sharply hitting screwdriver with a rubber hammer.

TROUBLESHOOTING CHECKLIST

This information is for checking pool pump installations that are
not operating properly. It is based on the premise that the installed
system will consist of a swimming pool pump taking water from a pool
and forcing it through a filter and back to the pool.
Warning: To guard against accidental personal injury,
the electric power to the pump must be turned off when
conducting the checking procedures outlined herein.
There are obvious exceptions, however, and authorized service
personnel should take necessary safeguards against the hazard of
electrical shock.
PROBLEM
Pump will not prime.
Pump delivers water for a period
of time, then stops pumping.
Pump does not deliver
rated capacity.
Motor overheats and shuts
off (overload).
Motor fails or does not
operate properly.
(CAUTION: SHUT OFF POWER TO PUMP)
• Stop motor, remove strainer lid, and fill case with water.
• Make sure suction line has no leaks, and that it slopes gradually from pump to pool with no high or
low spots.
• Make sure pump shaft turns clockwise when viewed from motor end opposite shaft.
• Check for plugged impeller.
• Make sure the check valve is not sitting in sand or mud, and that it is not stuck shut.
• Check for plugged impeller.
• Check for a suction leak.
• Check for blocked suction line.
• Check to see if impeller is rubbing.
• Check for plugged impeller.
• Check for a suction leak.
• Check for a blocked suction line.
• Check to see if impeller is rubbing.
• Make sure motor is properly wired for the correct voltage.
• Check wire size - wire may be too small. See selection chart on page 3.
• Make sure the impeller is not rubbing against the pump case.
• If within warranty, return pump/motor unit to place of purchase (with proof of purchase) for exchange.
Step 7: The motor can be removed by unscrewing 4 bolts.
Step 8: Install new seal following instructions in seal
repair package.
Step 9: Inspect O-rings for knicks and cuts. If damaged,
replace with new ones.
Step 10: Clean O-ring seat area. Lubricate O-rings with
petroleum jelly.
Step 11: Attach motor to seal plate and base.
Step 12: Attach case to seal plate with clamp.
Step 13: Install pipe plugs.
Step 14: Connect piping.
Step 15: Fill pump with water.
Step 16: Replace strainer lid.
Step 17: Reconnect power.
POSSIBLE CAUSES
6