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Motors should be lubricated with Supco "turbine oil" mainly because it is thinner and penetrates the bearing cups more thoroughly after cleaning them really well as noted above. HVAC supply houses will carry this as it is intended for small fan motors which spin faster and shaded-pole motors used in many things including older record players.
I have found that using this oil only on the motor and any pulley shafts will prolong any restoration. Using light household oil on shafts is fine but in a motor, it tends to accumulate excess and attract dirt, slowing the motor.
A motor is properly assembled if it spins for more than 5 seconds after power is removed.
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"When resistors increase in value, they're worthless"
-Dave G
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