Harrison m300 gearbox repair

[david gregg 1Participant @davidgregg1]

[david gregg 1Participant @davidgregg1]

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 WoodParticipant @brianwood45127]

That sort of recovery is very satisfying to do, nice one

Brian

[VicParticipant @vic]

Yes indeed Brian. The M300 is a fantastic lathe so nice to hear David’s is now working well again. Nice job David.

[JonParticipant @jon]

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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