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Hello all so I recent got a STIHL hs45 gifted you me it’s hard to pull over and rattles/ blades don’t move upon inspection it needs a new clutch as it’s loose and the clutch drum bearing had popped so new bearing fitted and re assembled to test (new clutch isn’t on yet) I cleaned and re lubricated the gear bid as necessary, hedge cutter fired right up and reeves the blades move success; however I can hear the bearing whearling like if you spin a sake board wheel is this due to the loose clutch or to you think it’s a bad bearing ps the blades move fine 

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Assume the crank is still OK ?

The bearing is spinning at idle and up to point the clutch engages in drum. Once engine speed is high enough the bearing is stationary, is that consistent with the nose you hear ?

A word of warning,  don't run the engine above idle without the clutch drum fitted, otherwise theres nothing to stop the clutch weights from ever expanding. 

 

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20 minutes ago, bmp01 said:

Assume the crank is still OK ?

The bearing is spinning at idle and up to point the clutch engages in drum. Once engine speed is high enough the bearing is stationary, is that consistent with the nose you hear ?

A word of warning,  don't run the engine above idle without the clutch drum fitted, otherwise theres nothing to stop the clutch weights from ever expanding. 

 

The crank seems fine yes and not exactly when the engine is at idle there is no noise but when I rev and the bearing starting spinning to move the blades I can hear the bearing spinning which is concerning as im starting to think it’s a dodgy/ damaged bearing or maybe it just needs to wear in? 

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31 minutes ago, B-rad said:

The crank seems fine yes and not exactly when the engine is at idle there is no noise but when I rev and the bearing starting spinning to move the blades I can hear the bearing spinning which is concerning as im starting to think it’s a dodgy/ damaged bearing or maybe it just needs to wear in? 

When you rev it up the clutch engages and the bearing will stop spinning so its not the clutch bearing you are hearing .

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1 hour ago, B-rad said:

The crank seems fine yes and not exactly when the engine is at idle there is no noise but when I rev and the bearing starting spinning to move the blades I can hear the bearing spinning which is concerning as im starting to think it’s a dodgy/ damaged bearing or maybe it just needs to wear in? 

Sorry,  think I had my head up my backside back there. Clutch bearing is in the housing 1 below the clutch drum,  item 3 in picture below ?

Ball race bearings usually pretty quiet from new usually get louder with age but hardly, not much being in. I struggle to believe you'd hear a bearing above the engine. It's more likely to be gear whine ... 

If the old bearing was totally knackered, clutch won't have been running true, might have implications for the gear.

Or maybe the brake band rubbing on the outside of the drum ?

 

Screenshot_2020-10-07-12-06-12-1.png

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1 hour ago, bmp01 said:

Sorry,  think I had my head up my backside back there. Clutch bearing is in the housing 1 below the clutch drum,  item 3 in picture below ?

Ball race bearings usually pretty quiet from new usually get louder with age but hardly, not much being in. I struggle to believe you'd hear a bearing above the engine. It's more likely to be gear whine ... 

If the old bearing was totally knackered, clutch won't have been running true, might have implications for the gear.

Or maybe the brake band rubbing on the outside of the drum ?

 

Screenshot_2020-10-07-12-06-12-1.png

Thank you yes number 3 is what was replaced and the old bearing has basically burst and the gearbox was covered in small ball bearings so the gears may well have taken a beating but all look fine to me the gearbox was cleaned and re lubricated, the clutch is loose and looks knackered tbh I haven’t fitted the new one yet, which on is the break band on the diagram but it honestly sounds like when you spin a skateboard wheel which is why I think it must be a bearing, I do not know what happened before the bearing blew as this machine was given to me afterwards and I’m trying to restore life back into it 

 

thank you for replies 

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Brake band is number 10 and lever to operate it no 11. Brake band would squeeze the clutch drum 12 to stop the drum spinning.

I know exactly the noise you're talking about when you refer to a skate board wheel, noise from my youth. Can't help but feel that would get downed out by the engine. Even the blades make a racket.

You could take the blades off and run it again - see if you learn something....

 

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1 hour ago, bmp01 said:

Brake band is number 10 and lever to operate it no 11. Brake band would squeeze the clutch drum 12 to stop the drum spinning.

I know exactly the noise you're talking about when you refer to a skate board wheel, noise from my youth. Can't help but feel that would get downed out by the engine. Even the blades make a racket.

You could take the blades off and run it again - see if you learn something....

 

Thanks I will try again with blades off and gears out also I would assume? Tbh I didn’t see a break band or anything when taking it apart but it all seems to fit back together nicely from videos I saw online of people replacing the same part I didn’t notice it either, strange 

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Had it In bits today after some playing in shave fount it’s the gears and clutch drum making the noise than you all for replies will be ordering new parts soon will update when fixed 

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