Jump to content

Log in or register to remove this advert

STIHL hs45 weird problem


B-rad
 Share

Recommended Posts

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 

Link to comment
Share on other sites

Log in or register to remove this advert

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. 

 

  • Like 1
Link to comment
Share on other sites

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? 

Link to comment
Share on other sites

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 .

Link to comment
Share on other sites

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

Link to comment
Share on other sites

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 

Link to comment
Share on other sites

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....

 

Link to comment
Share on other sites

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 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  •  

  • Featured Adverts

About

Arbtalk.co.uk is a hub for the arboriculture industry in the UK.  
If you're just starting out and you need business, equipment, tech or training support you're in the right place.  If you've done it, made it, got a van load of oily t-shirts and have decided to give something back by sharing your knowledge or wisdom,  then you're welcome too.
If you would like to contribute to making this industry more effective and safe then welcome.
Just like a living tree, it'll always be a work in progress.
Please have a look around, sign up, share and contribute the best you have.

See you inside.

The Arbtalk Team

Follow us

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.