I’ve just finished servicing this lovely old Kenwood KP-2022 belt-drive turntable. The owner asked me if it was worth servicing the old girl. You can imagine my reply!
They just don’t make them like this any more and this Kenwood is a particularly cool deck. The KP-2022 needed a full service, new belt, main bearing lubrication and motor lube as well.
Old belt drive decks like the Kenwood often used really heavy duty motors, designed to last many years with regular oiling. The problem is most owners never oiled their motors and that appears to be the case here. There are dedicated top and bottom oiling points and these were all bone-dry.
The result of this lack of lubrication is that the rotor support bearings at the top and bottom of the motor dry out. This then leads to motor noise, which can be heard as mechanically coupled noise when playing records.
In this case, I very patiently loaded the capillary oil feeds, top and bottom, with fresh thin machine oil, as well as oiling the bearing felt pieces that retain oil and then ran the deck for many hours to draw the lubricant through and into the top and bottom bearings of the motor.
The rest of the service involved cleaning, removing dust, treating wood, carefully setting stylus pressure and cartridge alignment and reconnecting the chassis earth inside the mains plug. It still amazes me just how often I find earths disconnected, and the inevitable resultant hum. Decks with a metal chassis are also potentially dangerous, should a live to chassis fault develop.
Owners often mistakenly rewire their mains plugs, thinking that removing a ground will remove a ground loop, and sometimes it will. The problem is that it creates a potentially dangerous situation and a noisy deck should the setup ever change!