Does Andover Norton make a replacement transmission cradle?

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N0rt0nelectr@

N0rt0nelectr@

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Maybe I'm loosing my mind, (it is a small thing easily misplaced). But I seem to remember an announcement saying that they or someone was making new transmission cradles for the earlier Commandos but with the MK3 style cotters to lock the spindle into place. I have been searching on the net and so far no luck.

John in Texas
 
Re: Does Andover Norton make a replacement transmission crad

If it's got the drilling for the crossover shaft, it could be universal.
 
Re: Does Andover Norton make a replacement transmission crad

NO as the MK3 has a fixed position for the transmission.

grandpaul said:
If it's got the drilling for the crossover shaft, it could be universal.
Click to expand...
 
Re: Does Andover Norton make a replacement transmission crad

Also, the lower engine mounting bolt holes in the Mk3 cradle are larger (the lower bolt being 3/8" not 5/16" despite what it says in the Mk3 parts book!).
 
Re: Does Andover Norton make a replacement transmission crad

grandpaul said:
If it's got the drilling for the crossover shaft, it could be universal.
Click to expand...

This is the MkIII...

https://andover-norton.co.uk/en/shop-de ... e-850-mk3-

Does Andover Norton make a replacement transmission cradle?
 
Re: Does Andover Norton make a replacement transmission crad

Well someone has made them in the past as I have one, cotter pins, slots for gearbox adjustment. Made prior to 82 when I bought the bike.
 
Re: Does Andover Norton make a replacement transmission crad

kommando said:
Well someone has made them in the past as I have one, cotter pins, slots for gearbox adjustment. Made prior to 82 when I bought the bike.
Click to expand...

Late 850 Mk2/2A models had cradles with the cottered "sealed for life" spindle assembly.

Edit: Correction. I think late 2/2A generally had the "sealed for life" spindle assembly but with the central bolt fixing, however, if you had one in '82 then it's possible some were fitted to 2/2A models.
 
Re: Does Andover Norton make a replacement transmission crad

I have a earlyish mk2A without the cottered pins and just the single central , the cottered pin version is fitted to a 750 combat, so a replacement bought before 1982 from new spares or a broken out late mk2A, it has the pressed in welch plugs, internal wicks etc.
 
Re: Does Andover Norton make a replacement transmission crad

kommando said:
the cottered pin version is fitted to a 750 combat, so a replacement bought before 1982 from new spares or a broken out late mk2A, it has the pressed in welch plugs, internal wicks etc.
Click to expand...

Any chance it could have been a Mk3 cradle that someone 'slotted' for gearbox adjustment?
 
Re: Does Andover Norton make a replacement transmission crad

I searched the Andover Norton web site and didn't see what I thought I had read about. What I was thinking was that they had made a cradle with the cotter set up but otherwise the same as the earlier models with the slots. If you have noticed all the replacement spindles have the slots machined into them like the MK 3's.
John in Texas
 
Re: Does Andover Norton make a replacement transmission crad

The slots look too good, straight sides to the cut depth of the hole so cut properly say on a milling machine and not finished with a file. Slots have a slight arc as you would need for rotating a gearbox through a small angle. I have never thought it odd as I remember them being in the RGM catalogue when they still printed them, must have a look as I kept a few and see which year has the earliest mention.
 
Re: Does Andover Norton make a replacement transmission crad

N0rt0nelectr@ said:
I searched the Andover Norton web site and didn't see what I thought I had read about. What I was thinking was that they had made a cradle with the cotter set up but otherwise the same as the earlier models with the slots.
Click to expand...

They have, cradle 06-6972, (see link in my first reply) otherwise I don't understand what you mean?


N0rt0nelectr@ said:
If you have noticed all the replacement spindles have the slots machined into them like the MK 3's.
Click to expand...

As I understand it, the currently manufactured 'long' and 'short' spindles have cotter slots and the bolt hole so can be used for either cotter or central bolt fixing.

http://www.nortonmotors.de/ANIL/SI%20Frames.htm
All our new swinging arm axles have flats provided for this type of fixing.
Click to expand...

https://www.oldbritts.com/13_060453.html

All pivot spindles have the 1/4 X 28 bolt hole and the two flats for the cotter locating pins.
Click to expand...

Does Andover Norton make a replacement transmission cradle?
 
Re: Does Andover Norton make a replacement transmission crad

L.A.B. said:
Late 850 Mk2/2A models had cradles with the cottered "sealed for life" spindle assembly.

Edit: Correction. I think late 2/2A generally had the "sealed for life" spindle assembly but with the central bolt fixing, however, if you had one in '82 then it's possible some were fitted to 2/2A models.
Click to expand...

My MKII has the welch plugs, felt wicks etc, and the spindle doesn't have cotter pin slots - just the central fixing bolt. AFAIK this is the only real identifier for a MKII. Perhaps with the MKIIA that changed.
 
Re: Does Andover Norton make a replacement transmission crad

The MK2 and MK2A were produced concurrently so other than the normal differences related to noise control I doubt they added to the list of parts to be fitted differently.

Checked parts list 31 for RGM and the only pre MK3 cradle is fitted with cotters and listed as fitting all pre MK3's, in both steel and alloy versions. For the steel they use the same part number as AN. Can't find the really old parts lists but sure they have been listing them for some time.
 
Re: Does Andover Norton make a replacement transmission crad

bill said:
NO as the MK3 has a fixed position for the transmission.
Click to expand...

That doesn't prevent a hybrid cradle from being used with MkIII primary & trans. Just torque it down where it lines up in the arced slots.

Hole sizes can be opened up for use with larger hardware.
 
Re: Does Andover Norton make a replacement transmission crad

L.A.B. said:
https://andover-norton.co.uk/en/shop-details/16872
Click to expand...
Yes, you are right that is what I am looking for.
Thank you.
John in Texas
 
Re: Does Andover Norton make a replacement transmission crad

Not suprised they have adjustable gearboxes.....with the tolerances in the crank cases...the cradles AND the gearbox shell mounting holes then a Mk3 belt system that fits one Mk3 giving correct belt tension comes NO WHERE near giving correct belt tension on another Mk3.
If I remember correctly the cotter pins were introduced to stop the spindle wearing the cradle spindle mounting hole oval which had the swinging arm moving around and made handling even more 'interesting'.
 
Re: Does Andover Norton make a replacement transmission crad

J. M. Leadbeater said:
Not suprised they have adjustable gearboxes....
Click to expand...

?

J. M. Leadbeater said:
.with the tolerances in the crank cases...the cradles AND the gearbox shell mounting holes then a Mk3 belt system that fits one Mk3 giving correct belt tension comes NO WHERE near giving correct belt tension on another Mk3.
Click to expand...

Considering the assembly was never intended to run a belt but a chain with an automatic tensioner then it's hardly surprising.


J. M. Leadbeater said:
If I remember correctly the cotter pins were introduced to stop the spindle wearing the cradle spindle mounting hole oval which had the swinging arm moving around and made handling even more 'interesting'.
Click to expand...

No....really! Well I never!
 
Re: Does Andover Norton make a replacement transmission crad

Normal are showing one on special offer at £170 + Vat, not sure of their source, its show as the cotter pin version.
Part no -066972NN816.
 
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