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Noise and vibration on SM

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Author 
ange

05-12-2001 14:38:47




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I dont know much about the live hyd on the supers but my SM is vibrating in the hoses just behind the pump. Its also making a humming noise like the pump might b cavitating. I added more oil to no avail. Any thoughts or ideas. Also I think the pump needs a seal to keep the oil from going into the engine. Is a hard thing to change? thanks for any advice. ange




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Bob M

05-12-2001 15:45:05




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 Re: noise and vibration on SM in reply to ange, 05-12-2001 14:38:47  
Ange - A sort of buzzing sound from the pump is normal for the Super M. Seems to be most noticable at idle - I suppose because it gets masked by other engine sounds at higher RPM. You can also feel the vibration in the hoses running to the pump.

The noise be the same but MUCH more pronounced when the pump cavitates (runs low on hyd fluid).

Yes, there's a seal on the pump shaft that keeps hyd oil from going into the engine. But I've never changed one so I can offer no advice...

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ange

05-13-2001 16:36:00




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 Re: Re: noise and vibration on SM in reply to Bob M, 05-12-2001 15:45:05  
Thanks for the advice thats good news about the vibration I thought I might have a bad pump.



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Bob M

05-13-2001 18:13:11




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 Re: Re: Re: noise and vibration on SM in reply to ange, 05-13-2001 16:36:00  
Ange - As long as the hydraulics work, and the level in the hyd reservoir doesn't drop (or the oil level in the crankcase rise!) it means the hyd pump is working OK.



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