Richard Pope Posted January 20, 2021 Report Share Posted January 20, 2021 (edited) I'm dismantelling my gearbox (to fit O/Drive and new main shaft) but cannot get my (old) mainshaft out. Haynes manual helpfully says use soft mallet and tap main shaft into gearbox. This is to move it and cogs into gearbox so one can then push out the rear bearing rearwards - OK, understand that. One has to do this as rearmost cog will not allow bearing to come out as it is too big for bearing hole. I cannot get the mainshaft to budge through the rear bearing inner race. Tap has led to a whack and I don't want to get the sledge hammer out. I've tried penetrating oil and heat but it will not budge (but bearing itself will move easily in its housing). 1.) Am I correct that this main shaft should move through bearing inner race? (I must be, surely.) 2.) Any tip or other way of getting the shaft out? Edited January 20, 2021 by Richard Pope Quote Link to post Share on other sites
John L Posted January 20, 2021 Report Share Posted January 20, 2021 The layshaft or bottom shaft has to come out first, and let the gears into the bottom, then you can tap the rear bearing out, you have to hold the top shaft forward and get the bear off the shaft, hope that makes sense John Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 20, 2021 Report Share Posted January 20, 2021 Have you read this? https://static1.squarespace.com/static/5c6dec53b10f25d4edf0b3f7/t/5d01959bf90de40001aace0e/1560384923734/Gearbox+Disassembly.pdf Peter W Quote Link to post Share on other sites
Richard Pope Posted January 20, 2021 Author Report Share Posted January 20, 2021 1 hour ago, John L said: The layshaft or bottom shaft has to come out first, and let the gears into the bottom, then you can tap the rear bearing out, you have to hold the top shaft forward and get the bear off the shaft, hope that makes sense John Actually not quite. Yes, the layshaft is out and teir gears are dropped to bottom so out of the way. You then tap the front bearing out, not the rear. You cannot get at the rear bearing to tap it out without first moving the main shaft forward to give a gap so that the bearing can come out to the rear. This is because the rearmost cog is right up against the gearbox housing so the bearing can only come out a few mm. 'tapping the mainshaft forwards creats the space between the rearmost cog and the casing. Quote Link to post Share on other sites
Richard Pope Posted January 20, 2021 Author Report Share Posted January 20, 2021 1 hour ago, BlueTR3A-5EKT said: Have you read this? https://static1.squarespace.com/static/5c6dec53b10f25d4edf0b3f7/t/5d01959bf90de40001aace0e/1560384923734/Gearbox+Disassembly.pdf Peter W Stupid me. I have all these as notes and did not bother to look them up before I started. Page 4 gives me another method that I must admit I was thinking of making up but now, it appears I'll have to. I just did not have the tool to hand. Thanks for pointing me in the rght direction. Quote Link to post Share on other sites
VLCcollector Posted January 24, 2021 Report Share Posted January 24, 2021 There are 2 main types for Knurling, the basic style is a knurling ROLLER the other cuts the knurl ands as such has less spindle and or bedways and axes wear Quote Link to post Share on other sites
Richard Pope Posted January 26, 2021 Author Report Share Posted January 26, 2021 On 1/20/2021 at 4:50 PM, Richard Pope said: Stupid me. I have all these as notes and did not bother to look them up before I started. Page 4 gives me another method that I must admit I was thinking of making up but now, it appears I'll have to. I just did not have the tool to hand. Thanks for pointing me in the rght direction. Sorted. Made up a pusher as per this and it worked. I have to say even with very tight pressure from tightening the nuts, it still needed very heavy use of a (soft head) hammer in combination with constant tightenimg of the puller nuts. Still after an hour it eventually freed itself. Quote Link to post Share on other sites
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