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Neidhart Rubbers
Posted: Sat Oct 26, 2013 12:28 pm
by Mustang Man
I bought a 1985 Gyro at the Barbers Vintage Days meet. It will not stand up straight. After dismantling The Joint shaft I discovered the Neidhart Rubbers appear to be formed incorrectly. I presume they are supposed to be round. At least that's the way they appear in the manual. I have been searching now for over a week for replacements to no avail. I feel there are others who have experienced this condition. Any help or suggestions would be greatly appreciated.
Thanks,
MM
Re: Neidhart Rubbers
Posted: Sat Oct 26, 2013 10:19 pm
by mousewheels
I've been into a couple failed Gyro pivots, yet never for failed limit stops.
Here's a pic of the assembly. As you suspect, they should be round. If no longer round, and taking apart the assembly is fun, try rotating them 90 degrees.
If not the pivot assembly is often reasonably priced (for Gyro parts) on eBay and it's an easy swap.
Re: Neidhart Rubbers
Posted: Sat Oct 26, 2013 11:07 pm
by motormike
Neidhart Rubbers
Posted: Sun Oct 27, 2013 11:20 am
by Mustang Man
I bought a 1985 Gyro at the Barbers Vintage Days meet. It will not stand up straight. After dismantling The Joint shaft I discovered the Neidhart Rubbers appear to be formed incorrectly. I presume they are supposed to be round. At least that's the way they appear in the manual. I have been searching now for over a week for replacements to no avail. I feel there are others who have experienced this condition. Any help or suggestions would be greatly appreciated.
Thanks,
MM
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 11:24 am
by swimmingfree
viewtopic.php?f=1&t=28477 this may help..
swimmingfree
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 11:36 am
by Mustang Man
That was my original post. After reading some responses, I wonder if the rubbers are the real problem?
The condition I am experiencing is the bike falls to one side or the other when at rest. I may have wrongly assumed it was the Neidhart rubbers. What exactly is the mechanism that causes the bike to stay upright? I have a shop manual, but it does not explain this. I have the joint shaft apart and I can't see anything broken or out of place.
Any help is greatly appreciated.
MM
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 11:39 am
by swimmingfree
you dont need to start a new post for ever question
...
swimmingfree
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 1:55 pm
by motormike
Mustang Man wrote: What exactly is the mechanism that causes the bike to stay upright?
MM
The "swing lock plate" is item #8 in the "JOINT SHAFT" PARTS FICHE...AND IS ONE OF THE PARTS RESPONSIBLE FOR LOCKING THE SWING.
The "swing lock pawl" is item #6 in the "JOINT CASE" PARTS FICHE...AND IS THE SECOND PART RESPONSIBLE FOR LOCKING THE SWING.
I hope this second explanation clears that up for you... 
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 2:58 pm
by Mustang Man
Exactly.
These parts " locking plate and locking pawl " work with the parking brake. I still believe the Neidhart rubbers are responsible for keeping the bike up right when at rest. If you rock the bike from side to side it will come to rest in a vertical position. Assuming the Neidhart rubbers are in good condition.
At least this is the way I understand it.
If I am wrong, please correct me.
MM
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 3:46 pm
by motormike
Gyros stay in an upright, vertical position ONLY when LOCKED into place by the parking brake.
If the parking brake is NOT LOCKED, the gyro will NOT stay vertical.
ONLY the parking brake mechanism is responsible for keeping the Gyro upright when at rest... 
Neidhart rubbers have no purpose other than to cushion the contact point at each end of the swing arc....
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 5:50 pm
by Mustang Man
Thanks Mike,
That's the answer I was looking for. I'm not that familiar with this scooter, but after removing the lower swing joint housing I have learned much. Especially with the engine in the bike. The shop manual says to remove the engine which would make the job much easier.
Thanks for your comment,
Mustang Man
Re: Neidhart Rubbers
Posted: Sun Oct 27, 2013 6:08 pm
by motormike
... ...and thank you MMan for being clear with your questions.
Welcome to the board... 
...happy to have more Gyro owners here.
I am jealous of you being at Barber vintage....maybe next year...
Re: Neidhart Rubbers
Posted: Sun Nov 03, 2013 12:51 pm
by Mustang Man
Barbers is a great event. It's always in October. Lots of scooter parts. My friends and I have a vendors site on row A. I hope more people will come, although it is usually sold out. There is also an auction, races, and of course the swap meet. Let me know if I can be of any help.
MM
