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Harrison m300 gearbox repair

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david gregg 1	16/11/2018 17:17:25
17 forum posts	the rotary dial for changing the screwi cutting which is numbered 1to 8 on the gearbox of my Harrison m300 had become very stiff in fact almost to change the settings ,so I decided to remove the gearbox to investigate .,when removed I discovered that the shaft on which the gears slide had become all glazed with a brown looking glaze after washing the shaft with some thinners to remove this glaze the gears moved with ease . I also replaced the sight glass for the oil level .After the gearbox was refitted to the lathe I refilled with the correct oil The handbook said that the gearbox required 1/2 litre of oil but I found that I needed 3/4 litre to bring oil to the correct level on the sightglass
Brian Wood	16/11/2018 17:35:57
2742 forum posts 39 photos	That sort of recovery is very satisfying to do, nice one Brian
Vic	16/11/2018 18:21:09
3453 forum posts 23 photos	Yes indeed Brian. The M300 is a fantastic lathe so nice to hear David’s is now working well again. Nice job David.
Jon	16/11/2018 21:57:01
1001 forum posts 49 photos	Testament to British quality and tolerances assuming its older than 20 years. Dont fancy removing my gearbox though must admit the last of its predecessor the 140 is a much better machine in several ways. For me the only gain with M300 is the no faff about with change wheels to cut any pitch imperial or metric - just dial it in simple.

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