Cat SX3 Layshaft Issues

[Rodrego]

Okay chaps, here's one for you.

Having purchased a lightly used Cat SX3, I'm in the process of stripping the car down for a full rebuild. I was preparing the rear diff, belt and upper layshaft and it appears that I have a tight spot every quarter turn of the layshaft. Has anyone experienced a similar issue?

[DCM]

Have you checked the bearings, is this with the belt on or off?

[Rodrego]

Yeah, I've checked and exchanged the bearings. It only goes tight under load I.e with the belt on at the right setting.

I'm still thinking of alternative explanations, but I keep coming back to the layshaft?!

[Robocop]

Any dirt in the pulleys of it somtimes dirt gets in the teeth and builds up causing a tight spot

[Rodrego]

Thanks for the tips guys, but its none of the above.

Im gonna organise a replacement layshaft and take it from there.

Thanks again.

[Rodrego]

Eh, the saga continues....!

Having received the new layshaft today, I popped it in and it's no better. I would tend to suggest its the bearings, but after swapping the bearings three times, It's just as bad with each one.

Now, as they'd say up in Scotland "I'm no dafty", but I can't see to understand what is causing the issue. Surely all my bearings can't be fooked?

As an ex Team Driver from early T/C days I'm deeply confused....

Any last ideas before I go out and buy new bearings?

Link of a video attached:

http://youtu.be/CdbWXRjUHaE