4 speed shift pattern?

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double diamond
Posts: 382
Joined: Thu Apr 28, 2011 1:20 am

Re: 4 speed shift pattern?

Postby double diamond » Thu Jun 28, 2018 9:25 pm

So if the transmission is in neutral or in between gears (i.e. false neutral) the shafts rotate freely? But when a gear is engaged the shafts become difficult to turn? It appears that the shaft shimming is ok. There should be no drag on the shafts when a gear is engaged.

Matt

Jordan
Posts: 782
Joined: Fri Dec 24, 2010 11:29 am

Re: 4 speed shift pattern?

Postby Jordan » Thu Jun 28, 2018 10:23 pm

...unless selector fork inside the gearbox is bent, or clearances are incorrect.

ranton_rambler
Posts: 122
Joined: Sun Jun 04, 2017 11:33 am
Location: Stafford UK

Re: 4 speed shift pattern?

Postby ranton_rambler » Sun Jul 01, 2018 6:50 pm

I measured the drag torque in top gear at 6Nm, which I reckon is about 2hp at 6000rpm. Seems like way too much when the motor only makes 11hp. So it's coming apart again. Nigel's suggestion is to leave the crank out so I can look/feel what's happening with the selector forks. Would have done it today but too much to do in the veg garden this weekend...
Ian

ranton_rambler
Posts: 122
Joined: Sun Jun 04, 2017 11:33 am
Location: Stafford UK

Re: 4 speed shift pattern?

Postby ranton_rambler » Tue Jul 03, 2018 9:35 pm

Sorted. Almost too embarrassed to say what the problem was....after looking at my stripdown photos I could see that I'd put the 4th gear on the output shaft on backwards and it could then rub on the right-hand case.

Jordan
Posts: 782
Joined: Fri Dec 24, 2010 11:29 am

Re: 4 speed shift pattern?

Postby Jordan » Wed Jul 04, 2018 8:07 am

It's a happy moment when you find what's wrong and it's simple to fix.


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