Maintenance
3A4586E
21
17N666 and 17N667 Motor Maintenance
Prior to performing any maintenance:
•
Turn motor off using the ON/OFF switch.
•
Unplug the power cord from the power outlet.
•
Remove motor from pump.
Brush Replacement
1.
Remove four motor cover screws (401) and lift the
cover (402) off of the motor.
2.
The fan (403) is pressed onto the armature shaft; to
remove the fan, insert two flat screwdrivers from
opposite sides under the fan and gently twist the
screwdrivers uniformly to pry the fan upwards and
off the shaft.
3.
Remove the bearing cover (404), being careful to
retain the wave washer (405) that rests between the
armature bearing (406) and bearing cover (404).
4.
The two motor brushes are each held down by a
Phillips-head screw and a hold-down tab. Loosen
each screw approximately one-turn, rotate the tab,
and pull up on the brush assembly (408) to remove.
5.
Replace both brushes, ensuring the side brush body
tabs are aligned with the brush holder (407).
Realign the hold-down tabs and gently tighten
screws to retain the brushes.
6.
Reinstall the wave washer (405) and bearing cover
(404) prior to gently pressing the fan (403) onto the
armature shaft (414). A groove will prevent the fan
from being pressed onto the shaft too far.
7.
Align the motor cover with the motor housing and
install and tighten the motor cover screws.
Armature Replacement
1.
Remove four motor cover screws (401) and lift the
cover (402) off of the motor.
2.
The fan (403) is pressed onto the armature shaft; to
remove the fan, insert two flat screwdrivers from
opposite sides under the fan and gently twist the
screwdrivers uniformly to pry the fan upwards and
off the shaft.
3.
Remove the bearing cover (404), being careful to
retain the wave washer (405) that rests between the
armature bearing (406) and bearing cover (404).
4.
The two motor brushes are each held down by a
Phillips-head screw and a hold-down tab. Loosen
each screw approximately one-turn, rotate the tab,
and pull up on the brush assembly (408) to remove.
5.
Remove the brush holder (407) by removing the two
nuts (8mm deep socket) and washers below the sta-
tor contact tabs.
6.
Remove the four screws (412) in the lower housing
and separate the motor housing from the lower
housing and armature assembly.
7.
Remove the motor coupling (419) by lightly holding
the motor coupling with a pair of long nosed pliers
and loosening the armature shaft.
8.
The armature shaft is lightly press-fit into the lower
housing. Gently tap the armature shaft from the
motor coupling end to remove the shaft.
9.
Using the new armature, assemble in reverse order.
Power Cord and EMI Filter Replacement
Remove the five switch cover screws (435) to access
the power cord (432) and EMI filter (428). Replace as
necessary.
ON/OFF switch Replacement
Remove the five switch cover screws (435) and the four
switch housing screws (425). Replace the ON/OFF
switch (426).
Potentiometer Replacement
Remove the four switch housing screws (425). The
potentiometer dial cover is removed by pulling upwards,
giving access to a nut; loosen and remove the nut being
careful to retain the washers. Remove the potentiometer
(422) housing from the motor side of the switch housing.
