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Case Tractors Discussion Forum
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David Brown Transmission Vibration

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Steve Lamper

07-14-2006 09:41:24




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I own a Wain-Roy BR100 Back-hoe which I believe is built on a David Brown 990 Tractor. I have a knocking noise and a vibration which shows up at high idle when in neutral. While I use the backhoe the noise/Vibration are most prevalent and seems to be coming from the gear box or clutch. To get rid of the noise I push in the clutch and release repeatedly until the noise is gone. There seems to be no performance issues while the vibration and noise are present. Only once have I heard the noise while in gear. The vibration is similar to something being out of balance. The noise is similar to something out of balance hitting a metal surface when it rotates. Any advice appreciated.

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Mike in La.

07-14-2006 17:47:34




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 Re: David Brown Transmission Vibration in reply to Steve Lamper, 07-14-2006 09:41:24  
Sounds like the pilot bushing. (it's in the end of the crankcashaft, main input shaft of transmission fits into it) If so, it's a $2.00 item that can only be replaced by splitting the tractor. Good Luck



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