Removal of first motion shaft - gearbox strip
Discussion
remove the small bearing on the end of the 1st motion and then undo the nut that holds the input gear on (you will need to lock the box up to do this (and the pinion nut at the same time))
once the input gear is off, remove the big circlip using a nice set of circlip pliers - dont try and do it with screwdrivers or the wrong tool as you will damage the alloy - this then makes it harder to get the gear out.
then, looking inside the box you will see the inner side of the large 1st motion bearing - this is what you need to hit with a drift, a large, blunt screwdriver will do, if used with care - be careful not to strike the gear teeth with it, or allow it to dig into the alloy case.
if you have never done this before, boil a kettle of very hot water and pour it around the case - the slight expansion will help if the bearing is tight (or gummed up with old oil)
then, with your drift against the bearing give it a stout tap - it should start to 'drift' out and will only take a couple or so taps before the gear and the bearing are out.
if its tight your big screw driver may start to foul the case or the gear, in which case you need to use a thinner one (with care). if its tight, repeat the trick with the hot water (obviously dry everything afterwards)
i have a couple of nice 'j' shaped brass drifts that where made just for this job, but if its a one off job the screwdriver will be fine.
if the gear refuses to move (damage to the snap ring area is probable cause - or the bearing has been shuffeling around and chewing the case up (if so case is scrap)) then you can weld a spare nut to a slide hammer adaptor - a couple of square on tugs with a slide hammer will get even the tightest bearing out.
easy!
once the 1st motion is out the way you can tap (using the screwdriver) the main double bearing out (never as much trouble), and then lift the kit out.
once the input gear is off, remove the big circlip using a nice set of circlip pliers - dont try and do it with screwdrivers or the wrong tool as you will damage the alloy - this then makes it harder to get the gear out.
then, looking inside the box you will see the inner side of the large 1st motion bearing - this is what you need to hit with a drift, a large, blunt screwdriver will do, if used with care - be careful not to strike the gear teeth with it, or allow it to dig into the alloy case.
if you have never done this before, boil a kettle of very hot water and pour it around the case - the slight expansion will help if the bearing is tight (or gummed up with old oil)
then, with your drift against the bearing give it a stout tap - it should start to 'drift' out and will only take a couple or so taps before the gear and the bearing are out.
if its tight your big screw driver may start to foul the case or the gear, in which case you need to use a thinner one (with care). if its tight, repeat the trick with the hot water (obviously dry everything afterwards)
i have a couple of nice 'j' shaped brass drifts that where made just for this job, but if its a one off job the screwdriver will be fine.
if the gear refuses to move (damage to the snap ring area is probable cause - or the bearing has been shuffeling around and chewing the case up (if so case is scrap)) then you can weld a spare nut to a slide hammer adaptor - a couple of square on tugs with a slide hammer will get even the tightest bearing out.
easy!
once the 1st motion is out the way you can tap (using the screwdriver) the main double bearing out (never as much trouble), and then lift the kit out.
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