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  1. #1
    Bronze Member
    Join Date
    Oct 2012
    Posts
    83
    Location
    Windham
    Tractor
    John Deere 70

    Default Setting up fan drive gears on 70 jd gas

    Had to replace original fan drive gears on 70 gas as per manual using the high backlash reading using dail indicator.Needed to tear governor housing back apart drain hole was pugged noticed gears are bad again.Installed a second set this time with more clearance,needing to know pulled the vent pump and again chipped teeth on ring gear.Any opinions from the experienced?

  2. #2
    Bronze Member
    Join Date
    Jul 2013
    Posts
    99
    Location
    Hastings, Mi
    Tractor
    JD4120

    Default Re: Setting up fan drive gears on 70 jd gas

    Governor shaft bearings are known to go bad. Are yours okay?

  3. #3
    Bronze Member
    Join Date
    Oct 2012
    Posts
    83
    Location
    Windham
    Tractor
    John Deere 70

    Default Re: Setting up fan drive gears on 70 jd gas

    The gear side bearing is new,the dist side felt very smooth.It is the outer edges of the ring gear teeth are being chipped even with the backlash set correctly almost has to be the pinion depth that is not right.

  4. #4
    Bronze Member
    Join Date
    Oct 2012
    Posts
    83
    Location
    Windham
    Tractor
    John Deere 70

    Default Re: Setting up fan drive gears on 70 jd gas

    Last of the two times apart for second gear change,studied how to get the distributor side bearing off could not find or see how.Will fire the tractor again and run it then pull it back apart to check.

  5. #5
    Bronze Member
    Join Date
    Oct 2012
    Posts
    83
    Location
    Windham
    Tractor
    John Deere 70

    Default Re: Setting up fan drive gears on 70 jd gas

    Talked to a pro yesterday finally have the lowdown on getting the governor up to speed,as soon as the new bearing shows up will tear into it one more time,finally with plenty of confidence.Got the new radiator core in yesterday.

  6. #6
    Bronze Member
    Join Date
    Aug 2009
    Posts
    91
    Location
    SD
    Tractor
    3020

    Default Re: Setting up fan drive gears on 70 jd gas

    Best to replace in pairs but that's not always an option. How much fan blade movement do you get when its all said and done? Should be about a 1/4" at the outside edge. Does it whine when the tractor is running? Carefully try moving the shaft around at the front mount. Also loosen the bolts either on the side cover or on the front of the governor when its running. If it gets quieter than you need another shim. A dial indicator should be the most precise but its got 60 years of wear so whatever it takes to make it quiet! One other thing, where the distributor side bearing rides in the gov housing gets loose. Might want to check that.

    Tim

  7. #7
    Bronze Member
    Join Date
    Oct 2012
    Posts
    83
    Location
    Windham
    Tractor
    John Deere 70

    Default Re: Setting up fan drive gears on 70 jd gas

    Nothing wrong with the bearings,both will be new when reassembled.Decided to strip both shafts and check for runout.Both had .010+ so luckily found nos shafts and gear set (very expensive) but when back together should be the last time.Been sleeping good since then.The governor housing has zero wear in the bearing area.

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