If The Speed Becomes Erratic; For Maintenance - Oracle DELPHI MK III Owner's Manual

...if the speed becomes erratic

Check:
Drive belt to make sure it rides in the center of the motor pulley.
-
Motor pulley height ( should be 71mm or 2.800 inches )
-
from the top of the pulley and to the acrylic base.
-
Lubrication in main bearing
-
Drive belt for oil contamination
-
Drive belt for excessive wear
-
For damaged or defective main bearing
-
For main bearing contamination
-
Motor connection plug for a broken wire
-
Drive module for a broken wire
-
Defective motor
-
Defective drive module
-
Note1: To test bearing damage or contamination remove the drive belt. Inspect the spindle for
obvious anomalies at the friction points. Install the platter and spin it gently. Excessive bearing
friction will tend to slow down the platter. Since this can happen to various degrees, one way to
determine excessive friction is to watch when the platter comes to a strop, too much friction will
force the platter to move backwards slightly. Having to replace the drive belt more than once a
year could also be a sign of excessive bearing friction.

...for maintenance

The blue cloth supplied can be used to clean all the metal parts, acrylic parts and the mat.
-
Always use the colth dampened with water to dust the acrylic parts. Do not use this cloth to
pick up oil spills, keep it for the delicate work.
-Unless contaminated, there will be no need to dismantle the main bearing. If required it is simple
to remove it from the subchassis by unscrewing the 3 socket head cap screws holding it to the
plinth. Keep in mind there is oil in the bearing assembly hold it straight. Since the oil is
contaminated, it must be thrown away. Remove the 3 socket head cap screws holding the bottom
cover. Clean the thrust pad and the bushing with denatured alcohol. Re-assemble making sure to
secure the screws firmly. Do not forget to add the content of one oil vile ( 2cc ) before installing
the platter.
Delphi MKIII
Owner's manual