Gyrodec - cause of slow speed

[viggster]

Hi all -

In case anyone else has had this problem I wanted to share my experience.

I have a Gyro with a QC power supply and it started running slow a little while back.

It turns out that over time the belts had shredded small amounts of rubber and these small slivers fell into the small gap below the top of the motor drive shaft - clogging up the motor innards. Once the tech cleaned out the motor that solved the problem!

So for those in a similar situation - don't despair just repair!

Keep 'em spinning.

Viggster

[albertan]

Thank you for a very informative post. I wonder if a drop of light oil (like Linn) on the motor shaft annually would stop this from occurring? Or more frequent belt changing?

[blakep]

Thank you for a very informative post. I wonder if a drop of light oil (like Linn) on the motor shaft annually would stop this from occurring? Or more frequent belt changing?

Possibly more frequent belt changing. My Gyro dates to the early 80's and has never developed a problem like this. I would say that less than ideal setup may contribute to belt "shedding" as well.

There is a grub screw on the pulley to secure it firmly to the shaft: loosening that grub screw and then rotating the platter manually will "automatically" adjust the pulley to the proper height on the shaft so it can then be secured. I can't help but think that the belt might be chewed up more during operation if the pulley is set high or low (not to mention the table will sound weaker with that kind of setup).

Personally, I like to change the belt every 18-24 months and give the motor a couple of drops of oil every 6 months or so. Has worked for me for the past 27 years or so.

[viggster]

Thanks for that info blakep re the pulley grub screw - i'll have to check to make sure it is secure.

The belts had been changed regularly while i've been the owner so the shredded rubber must have accumulated in the past.

[blakep]

Thanks for that info blakep re the pulley grub screw - i'll have to check to make sure it is secure.

No problem. Not just secure, but adjusted so the belt is riding in a dead horizontal position vis a vis the pulley and the platter. If the pulley is sitting either high or low on the shaft depending on exactly how the suspsension is set up (ie. a little higher or lower), my thought is that the tension induced in that situation by the pulley either on the high or low side of the belt, might be contributing to that "belt shedding".

What I do in setup is place an average record on the platter with clamp, loosen the tension on the set/securing screw on the pulley, then manually rotate the platter a bit. This will move the pulley and essentially self adjust it into the proper position on the shaft so the belt is dead horizontal when playing and the pulley can then be tightened down and secured in the right position.

[albertan]

The pulley grub screw requires a 1.5 mm hexagonal wrench. As to motor oil, does anyone have any suggestions as to what works and will not hurt anything?