Ok the selector forks fit into their blank spaces in-between slotted rings. Now does the 1st fork by the clutch go into the layshaft behind? In the manual it shows that fork back and the others forward. Then the 5th gear fork looks like it goes into the lock collar. No? Ok then what position or positions is the shifter drum supposed to be going through as you set it up?
Transmission selector forks sf
- Thread starter Evan
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Dellortoman
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- Location
- Tasmania, Australia
Huh ???
Selector forks don't go into the space between the slotted rings. They go in the slots. That's why there are slots.
Selector forks don't go into the space between the slotted rings. They go in the slots. That's why there are slots.
piranha-bro2
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- Location
- Melbourne
Stop being pedantic, Cam! :-*
Did you take the forks completely off the shaft? Once you mix them up it can be a tad confusing, but really, it's not rocket science ... two of the forks have the 'pin' that goes into the selector drum slot facing one way, and the other has it facing the other - take that as your starting point, then look at the size of the slots (OD that is); I think two are smaller than the 3rd? If you've got your bottom case in place, just look at the main and layshafts, have a guess what goes where, and then do a dummy fit.
Whatever you do, once you are reassembling, DON'T forget the pin that prevents the selector fork shaft from sliding left into the back of the clutch drum. And DON'T let the pin fall out while you're not looking - seen cases jammed up when the studs are tightened, with the pin wedged nicely under or over one of the gearbox bearings.
Did you take the forks completely off the shaft? Once you mix them up it can be a tad confusing, but really, it's not rocket science ... two of the forks have the 'pin' that goes into the selector drum slot facing one way, and the other has it facing the other - take that as your starting point, then look at the size of the slots (OD that is); I think two are smaller than the 3rd? If you've got your bottom case in place, just look at the main and layshafts, have a guess what goes where, and then do a dummy fit.
Whatever you do, once you are reassembling, DON'T forget the pin that prevents the selector fork shaft from sliding left into the back of the clutch drum. And DON'T let the pin fall out while you're not looking - seen cases jammed up when the studs are tightened, with the pin wedged nicely under or over one of the gearbox bearings.
Dellortoman
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- Tasmania, Australia
I wasn't being pedantic. It sounded to me like he wasn't fitting the forks into their slots. I know that's bonkers, but stranger things have happened.
Ernesto
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- Location
- Hamburg, Germany
If only I had taken a pic. Fig 37 in the manual I thought would point it out but it does not.
Looks like 1st selector fork goes in between the 2 gears close to clutch that do not separate on the main shaft. Or does this one go on the groove on the layshaft not the main shaft. Manual has this 1st fork leaning that direction.
2nd fork into groove in-between 2nd and 3rd.
And then 3rd fork would have to go inside the lock collar. It looks like this is the only place it can go.
Looks like 1st selector fork goes in between the 2 gears close to clutch that do not separate on the main shaft. Or does this one go on the groove on the layshaft not the main shaft. Manual has this 1st fork leaning that direction.
2nd fork into groove in-between 2nd and 3rd.
And then 3rd fork would have to go inside the lock collar. It looks like this is the only place it can go.
If I had only taken a pic. Fig 37 in the manual does not show forks in position.
It looks like 1st fork by clutch will go either in-between 2 gears on the main shaft that do not separate Or does this 1st fork go on the layshaft groove?
2nd fork looks like it has to go in the groove in-between 2 & 3rd gears.
Then 3rd fork looks like it has to go in the lock collar. I don't see where else.
Big question is does the 1st fork go on the trans mainshaft or does it go on the layshaft? It leans back in the manual pics.
Or do all 3 forks fit into the trans mainshaft.
It looks like 1st fork by clutch will go either in-between 2 gears on the main shaft that do not separate Or does this 1st fork go on the layshaft groove?
2nd fork looks like it has to go in the groove in-between 2 & 3rd gears.
Then 3rd fork looks like it has to go in the lock collar. I don't see where else.
Big question is does the 1st fork go on the trans mainshaft or does it go on the layshaft? It leans back in the manual pics.
Or do all 3 forks fit into the trans mainshaft.
piranha-bro2
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- Location
- Melbourne
If you get it wrong it will be immediately apparent. Pretty simple jigsaw, really.
piranha-bro2
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- Location
- Melbourne
The pegs on the underside of each fork (that ate to the slots in the selector plate) are your key to where they go. Two fwd, one back
Ernesto
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- Location
- Hamburg, Germany
I never bothered to remember, because it'll be obvious.
I'd say you can't do it wrong.
Ernesto
"While you're at it": renew spring #33 from the diagram.
It's at least 45 years old. Good opportunity now, might
save you from a lot of work one day..
I'd say you can't do it wrong.
No, there is one collar on the layshaft, 2 on the mainshaft.
Ernesto
"While you're at it": renew spring #33 from the diagram.
It's at least 45 years old. Good opportunity now, might
save you from a lot of work one day..
Laverda SF
Hero member
My top concern with the Breganzie Tranny is that Neutral Spring is in place before buttoning her up ;o)
CLEMTOG
Hero member
with everything laying in the bottom case, you should cycle the gears several times to be sure everything is hunky dory, there is a factory tool to make this easier on the twins, it fits over the gear teeth of the selector drum spindle/shaft, oddly this tool does not fit the triples but it looks like it should.Not a vital bit of kit improvisation can be your best friend. Mine is out on loan at them moment so I am unable to photograph it.
CLEM
CLEM
Ernesto
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- Location
- Hamburg, Germany
CLEMTOG
Hero member
well on the triples that I have tried it on, the crankcase casting around the gear prevents it dropping over the teeth.
Normally I would be able to take a picture and show what I mean, as there is an engine on the bench that would be suitable, but the key is on loan to a 750 owner who has fourth gear bush disintegrating problems, so I cant.
CLEM
Normally I would be able to take a picture and show what I mean, as there is an engine on the bench that would be suitable, but the key is on loan to a 750 owner who has fourth gear bush disintegrating problems, so I cant.
CLEM
Tippie
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- Dr?bak, Norway
"Guess the foundry misjudged wall thickness here and there."
Sacrelidge
These are precision instruments, built to micron tolerances!!
Sacrelidge
These are precision instruments, built to micron tolerances!!
piranha-bro2
Hero member
- Location
- Melbourne
Tippie said:"Guess the foundry misjudged wall thickness here and there."
Sacrelidge
These are precision instruments, built to micron tolerances!!
