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32 Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08
• Close the existing shut-off valves in front of and behind the pump!
• If no shut-off valves are fitted, drain the system!
Dismantling the motor
1. Loosen motor fastening screws and remove the motor from the centring on the pump housing.
CAUTION
Damage to property!
If the motor head is separated from the pump housing during maintenance or repair work:
• Replace O-ring between motor head and pump housing!
• Mount the O-ring, untwisted, in the angled end of the bearing plate that faces the im-
peller!
• Ensure correct position of the O-ring!
• Perform leakage test for maximum permissible operating pressure!
Installing the motor
The motor is installed in reverse order of dismantling.
1. Insert the motor into the centring of the pump housing and insert the four motor fastening screws into
the threaded holes.
2. Tighten motor fastening screws diagonally. Observe tightening torques! (see table “Tightening torques
for motor fastening screws” [}23]).
For commissioning of the pump, see the “Commissioning” chapter.
If only the control module has to be brought into another position, the motor need not be pulled out of the
pump housing completely. The motor can be rotated in the pump housing into the desired position (follow
permissible installation positions). See the “Aligning the motor head” [}23] chapter.
NOTICE
In general, turn the motor head before the system is filled.
Perform leakage test!
10 Troubleshooting
10.1 Personnel requisition
The troubleshooting must only be performed by a qualified specialist, work on the electrical connection must
only be performed by a qualified electrician.
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