Use extreme care when servicing solenoids. The
surfaces can be very hot and a severe pinching hazard
exists under the hood.
To determine which solenoid might not be fully engaging,
select Test Area from the Test Screen. The test area
(shown) will be
displayed. Press the
vacuum solenoid button
to disengage the vacuum
solenoid. If there is no
change in the hum/buzz,
press the buffer brush
solenoid button. This will engage the two buffer brush
solenoids. By pressing these two buttons and listening for
changes in the hum/buzz, one should be able to determine
which of the three solenoids is not fully engaging.
The particular solenoid that is not fully engaged can also be
found by feeling NEAR the solenoid. A solenoid that is not
fully engaging will feel hot. It will also vibrate as it is making
the sound.
Solenoids that do not fully engage are usually out of
alignment. If a misaligned solenoid is found, turn off power
and unplug machine, loosen the adjustment screws, realign
the solenoid, tighten the screws, and recheck. Any time the
position of a solenoid is adjusted, the vacuum head or buffer
brush, as applicable, will need to be checked for adjustment.
It is also possible that oil or debris has gotten on the
solenoid shaft and is preventing the solenoid from engaging.
Wipe the solenoid shaft with a clean, dry cloth.
If the solenoid continues to buzz or feel hot and adjusting it
does not correct the problem, replace it. Refer to Section 7 -
Parts for part numbers.
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