Jumping out of fourth gear.

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Cucciolo - the Lil Pup
Posts: 24
Joined: Wed Feb 29, 2012 2:26 am

Jumping out of fourth gear.

Post by My750GT » Sat Mar 03, 2012 3:26 am

Guys and Gals,

Has anybody had the issue of gears dropping out? I have read else where that some people have had this problem with first but mine is with fourth. It happens under acceleration and also while cruising. It doesn't happen when going down the gears using compression braking. I'm guessing it is a worn part of the gearbox and that the fix is best left for a professional but I would like to know what is going on inside there.

'72ish 750 GT
Functional bitser
Western Australia

750 Sport [BEVEL]
Posts: 248
Joined: Sat Jul 31, 2004 9:54 am
Location: Antwerpen

Re: Jumping out of fourth gear.

Post by ducadini » Sat Mar 03, 2012 10:02 am

Check Bevelheaven, manuals index, 750 Gt and Sport spare parts, page CF.
While shifting from third to fourth, a gear (160.40)has to disengage the third gear (160.30), move about half an inch and engage fourth : coupling with out-shaft (300).
First check the nut (090) that holds the sprocket, if it's loose, this could have an influence on the 4th.
The out-shaft runs on needle bearings(320) ON the in-shaft, if those are shot, well, good luck.
If it's the out-shafts dogs that are worn, the ones on the coupled gear on the in-shaft (160.40) are usually also gone.
Good news is that nearly all bevel gearbox parts are interchangeable, no need to go and look for RC gearbox-gold.
Even new parts are available.
good luck
Nego i ricordi peggiori
Richiamo i migliori pensieri

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