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Message Icon Topic: Howard Gem series v Jackshaft Post Reply Post New Topic
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Vigamor
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Quote Vigamor Replybullet Topic: Howard Gem series v Jackshaft
    Posted: 12 Aug 2013 at 10:22pm
Hi, series V Gem Jackshaft assembly anyone know where i can get mine refurbished?the problem with mine is that there is wear in the housing where the `fixed dog` runs. There does not seem to be any bearing at all ! is this normal? ( i.e. the jackshaft spins on the housing itself. I seem to have about an eighth of an inch play in here.Another question ... how much tolerance can there be around this areaIn advance... thanks allVig
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hitchinsm
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Quote hitchinsm Replybullet Posted: 15 Aug 2013 at 10:09am
Can yo post a picture of it and what width is the rotor box
Regards Mike
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Quilla
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Quote Quilla Replybullet Posted: 04 Sep 2013 at 2:13pm
  My J A P engined Gem is in a similar condition ,the shaft runs directly in the housing casting which appears to be made of cast iron .This is OK as hard steel and cast iron work well together providing some lubricant is present. I ended up fitting shim steel to fill the gap between the two surfaces. How long will is work , cannot say but as my machine will get very little work so we will see .
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plonker
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Quote plonker Replybullet Posted: 04 Sep 2013 at 2:29pm
Do you mean the jackshaft to the driving sprocket?how can it touch the sides of the housing? it is supported at the sprocket end by a ball bearing race, and when in use, at the other end by the sliding "Dog" or am i missing something?
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Quilla
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Quote Quilla Replybullet Posted: 05 Sep 2013 at 1:43pm
The inner end of the Jackshaft has a fixed dog that mates with the sliding dog assembly .Berhind the fixed dog the jackshaft runs directly in the cast iron outer case.I guess this set up is a bad design because the tension on the roror driving chain puts load on this bearing and over time it wears out .No doubt dirt and poor lubrication contributes to the wear.
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hitchinsm
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Quote hitchinsm Replybullet Posted: 06 Sep 2013 at 4:00pm
The guy has been asked to post a picture of what he is talking about. Maybe then when we are suer of what he is talking about we can help him.
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Quilla
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Quote Quilla Replybullet Posted: 11 Sep 2013 at 2:33pm
 Correction , The jackshaft does not run on the housing .The back of the fixed dog does. Sorry for the crook information .
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