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  1. #1
    Member
    Join Date
    Oct 2008
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    43
    Location
    Cambridge, MN
    Tractor
    Yanmar 1500D

    Default How to fasten to a straight crankshaft

    I've got a bobcat 610 that has been converted to a Honda engine, which has a straight crankshaft rather than a tapered one like the old Wisconsin engine had. I'm having a terrible time keeping it tight to the shaft. No matter what I do it works loose and begins flopping on the shaft. There's a brass bushing inside the sheave to adapt it down to fit the shaft and there are two set screws intended to tighten against the shaft to hold it tight. But it doesn't seem to hold it. Any ideas?

  2. #2
    Veteran Member
    Join Date
    Oct 2010
    Posts
    1,100
    Tractor
    NHtd75

    Default Re: How to fasten to a straight crankshaft

    Quote Originally Posted by jeffscoggins View Post
    I've got a bobcat 610 that has been converted to a Honda engine, which has a straight crankshaft rather than a tapered one like the old Wisconsin engine had. I'm having a terrible time keeping it tight to the shaft. No matter what I do it works loose and begins flopping on the shaft. There's a brass bushing inside the sheave to adapt it down to fit the shaft and there are two set screws intended to tighten against the shaft to hold it tight. But it doesn't seem to hold it. Any ideas?
    Try a local industrial supply for a split taper bushing and sheave. If you buy one get installation instructions and follow them to the letter, especially the cap screw torque.

    The bushing will look similar to this one linked.

    WOODS ST 1 3/16 SPLIT TAPER BUSHING | eBay

  3. #3
    Elite Member dex3361's Avatar
    Join Date
    Aug 2008
    Posts
    3,568
    Location
    N. of Charleston WV
    Tractor
    Kubota L4400-1 HST,FEL, 3x3 remotes, TNT. BX1500 54 mmm

    Default Re: How to fasten to a straight crankshaft

    I agree with SandburRanch a taper lock bushing is what you need.
    McMaster Carr industrial supply also has these bushings.
    Randall



    1Timothy Chapter 2:
    3 For this is good and acceptable in the sight of God our Saviour;
    4 Who will have all men to be saved, and to come unto the knowledge of the truth.
    5 For there is one God, and one mediator between God and men, the man Christ Jesus.
    From: The HOLY BIBLE

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