Garrard Zero arm bearings

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colver
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Garrard Zero arm bearings

Post by colver » 05 Apr 2016 09:31

Does anyone know how to tighten up the screw or bolt holding the small bearing at the end of the thin cantilever bar on the zero 100 arm? Mine needs tightened up as its causing the rear of the headshell to droop down a bit. The two bearings on the headshell have an aluminium disc pressed in on top, was wondering if these are removable and therefore allowing access to the head of a screw or bolt.

Audie
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Re: Garrard Zero arm bearings

Post by Audie » 05 Apr 2016 18:38

I think you should be very careful with adjusting factory arm settings. all your good work may come unstuck. I have no knowledge of the Zero 100 arm, but it appears to be quite complex,to achieve minimun anti-skate as the arm traverses the record.
Your T/T apparently has not had a lot of use before it was kept in storage, so how would the bearing clearances have been compromised? That dip in the headshell may have been a consequence of the complexity of the arm movement,and part of the design? If it plays well, then it may be best to leave as is.
Might be best to get expert advice before tinkering. I wouldn't like to see you end uo with a nice turntable with a compromised arm.

Audie

colver
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Re: Garrard Zero arm bearings

Post by colver » 06 Apr 2016 13:08

Hi Audie, I had another look at the rear Headshell bearing today (after 2 hours working on the replacement motor, ANOTHER STORY FOR ANOTHER DAY!) and I must admit its definately not right. The back end of the zero headshell is right down and therefore it makes the cart look as though the arm/cart havnt been set up correctly. You may be able to see on the close up photo that the rear is down due to the bearing needing tightened up. You can see the gap in the middle of the two plastic bearing holders. There is a nut on the underside the size of those used in headshells/carts so there is a bolt in there somewhere.

colver
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Re: Garrard Zero arm bearings

Post by colver » 06 Apr 2016 13:11

This is the close up of the hsadshell showing the saggy rear needing tightening up.
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Audie
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Re: Garrard Zero arm bearings

Post by Audie » 06 Apr 2016 16:16

Hi colver. Still tend to think that gap could be designed in, because if it was not, you should have noticed while playing records, but the sound passed with flying colours.
Since there is no problem with the sound, you should question your desire to adjust the arm.
If you can't resist the urge to attempt the adjustment, at least first find out if the gap is not also a feature on other Zero100's. It is easy to make mistakes without a good understanding of the design principles.
Hope I don't come across as pesky/annoying? Just trying to help. :idea:

Audie

colver
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Re: Garrard Zero arm bearings

Post by colver » 06 Apr 2016 17:25

Hi Audie, haha dont be daft, all the input and help I can get is very usefull. The reason I think it is adjustable is that it is a tiny bolt and nut. However the bigger bearing just above the headshell appears not to be as its a sort of rivot which obviously cant. If the small one could be tightened slightly then the gap between the two bearing holders would reduce from 3mm to maybe 1 or 1.5 mm and therefore lift the back of the headshell slightly. The photo isnt all that clear but the cart is way down at the rear by miles so cant be doing the stylus or records that much good. The new motor hasnt worked. It was a NOS one from a model 90 which looks virtually the same but with some slight differences. The main one is that I think it works on a different voltage but im not absolutely deffinate on that one. So the quest is back on for a motor. A cheap scruffy looking zero 100 or 86b will hopefully come up soon of fleabay.

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Re: Garrard Zero arm bearings

Post by Audie » 07 Apr 2016 12:51

I thought it was a gamble that that motor would work. Since they are not expensive, it might be better to get another Zero100 for spares.

Since you deduce that the "gap" can be adjusted to raise or lower the rear of the cartridge, then maybe it is intended to adjust for the different depth measurement of cartridges, so that the bottom of the cartridge is parallel to the record surface.and so attain correct vta/sra for the cartridge in use and with a particular thickness/weight record. (You could use an average 150/170gm lp if you wish).
To decide if the "gap"needs to be adjusted,check if the bottom of the cartridgeis parallel to the surface of the record. If it is close to parallel, then you would not need to adjust,as it will change slightly for different thickness records.
But this should be in the User Manual, if it is indeed a User adjustment to make!

Just my thoughts, from one with zero practical knowledge of the Garrard Zero100, but am interested in the unit. If I were younger I would get one myself. [-o<

Audie

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Re: Garrard Zero arm bearings

Post by Audie » 07 Apr 2016 16:44

Hi colver. I just had a look at the Zero100 User Manual on VE. I think that "gap" you see above the rear of the cartridge may be to accomodate the positioning of the cartridge,tilting the rear up or down,for manual(single record), or automatic (Stacked records).
There is a manual(M) and automatic (A) lever on the front of the tonearm.
If you move the Lever between the M and A setting,you might even notice something happening there. With this information, it would be prudent to leave it alone, unless you can be sure the"gap" has nothing to do with the tilting of the back of the cartridge.

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Re: Garrard Zero arm bearings

Post by Audie » 08 Apr 2016 16:10

Looked at the wrong model,colver. Your Zero 100cs is the single record play model ,which does not need the Lever to tilt the back of the cartridge to play stacked records. The cartridge position is fixed.
Can't help? you any more, but you'll work it out I'm sure.

Audie

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Re: Garrard Zero arm bearings

Post by A70BBen » 10 Apr 2016 07:38

Both the brushed metal trim pieces on the headshell bearings can be pried loose with a very sharp knife such as a hobby knife. I don't remember any adjustment on the small auxiliary one but it's been a long time since I've taken one of those down. The main bearing on the top of the tonearm head has a small plastic hex nut that could come loose. I used to undo those to replace the tonearm wiring which was a weak point on the early Zero 100s; the wires would break from flexing.

colver
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Re: Garrard Zero arm bearings

Post by colver » 05 May 2016 19:29

Sorry I never got back to you Guys. Been very busy with work. Yes I noticed the M and A on the front of the headshell but there is no lever. Typical eh! As for the rear headshell bearing, im going to grow a set some evening and really prise at the grey top disc with a very fine watch makers screwdriver or craft knife because im sure it can be adjusted. First off though I need yet another motor!

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Re: Garrard Zero arm bearings

Post by Robbie_uC » 02 Jun 2019 20:59

Hi...I know this is an old thread. Did you ever resolve this issue? I have a Zero 100 that just might have the same issue. I re-greased the entire thing an got it running as good as can be, but I haven’t figured out how to get those metal disks off for adjustment.
Rob

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