#9 Bearing

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Viewing 9 posts - 1 through 9 (of 9 total)
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  • July 11, 2009 at 1:16 pm #40698
    J-L
    Participant

    I’m rebuilding a #9 mower and was going to put the new bearing assembly on that I got from Norm Macknair. The problem I’m having is getting the old bearing off the wrist pin. Any tricks or suggestions for this?
    I sure don’t want to ruin anything and set me back on this project.

    July 11, 2009 at 5:15 pm #53222
    ngcmcn
    Participant

    Do you mean the bushing on the end of the pitman that connects with the wrist pin.?. If the bushing is frozen to the wrist pin ….replace the wrist pin.

    Neal

    July 12, 2009 at 1:24 pm #53225
    J-L
    Participant

    That’s what I meant. That bushing will have to come off to get the wrist pin off anyway it looks like.
    Are the wrist pins tough to replace?

    July 12, 2009 at 2:01 pm #53221
    Rod
    Participant

    Did you try heating it?

    July 12, 2009 at 4:00 pm #53223
    ngcmcn
    Participant

    J-L,

    The easiest way to get the wristpin out is to pull the fly wheel and fly wheel shaft, which means opening the tranny cover and unscrewing the pinion gear(standard direction threading) grind off the mushroomed end of the wrist pin that comes through the fly wheel and drive it or press it out. Its not to bad a job. Or, I’ve never tried this, take a hack saw or saw zall cut half way throught the wrist pin, close to the flywheel and bust it off with a hammer then drive out the stud. While your in there put a new shaft bushing in as well and oil seals.(MackNair’s). My current method for getting the shaft bushing out is to take a broom handle or something like that and pop the tranny end bearing out, you’ll see when you open everything up, then a small cold chisel to bend the bushing over in the frame a bit, then a brass or what have you drift of close size to the bore and drive it out an alll the way through into the tranny. Watch out for metal shards. Not eloquent but works. Make sure tranny is clean.

    Goood luk

    n

    July 12, 2009 at 11:27 pm #53227
    near horse
    Participant

    I’m in the same boat as Wes – I want to replace the bearing on the wrist pin/flywheel w/ one of Norm’s. My bearing “housing” is held together w/ 4 bolts (older ones seem to be riveted) and the front portion comes right off. How about using a gear puller to pull the rest of the bearing off the wrist pin? I just can’t believe (or don’t want to) that I need to pull the flywheel off just to replace this bearing – but I’m usually wrong. Dang.

    July 12, 2009 at 11:48 pm #53224
    J-L
    Participant

    Geoff, precisely what I’m talking about. Why not a gear puller? Good idea. I may try a little heat as well.
    It seems like that bushing should be good and tight so your bearing will spin and not the bushing on the wrist pin. I may be wrong, but that seems like the only way a bearing really works.
    Not wanting to booger this nice machine up is what makes me a little leary of getting western with it. It is in really good shape and I probably could have mowed with the bearing that’s on there, but it does have just a little slop. The new piece from Macknair’s is really nice and looks like it should really work well
    I’ll try harder and see what happens. Keep me posted on yours would you Geoff?
    Thanks to everyone for their replies.

    July 13, 2009 at 1:56 am #53226
    Iron Rose
    Participant

    I’ve rebuilt a couple of #9 mowers. I’ve found that removing the flywheel and shaft is the easiest to do and nesssary if you are going to put a new seal in the bottom end. Also when you have it apart it would be wise to change the bushing on the lower end. Bottom bushing can be difficult to get out but I usually take a hacksaw blade and split the bushing and use a homemade puller to get it back in. If the bottom bushing is wore you get a lot of vibration.

    July 14, 2009 at 11:35 pm #53228
    near horse
    Participant

    Hey Wes,

    I got the bearing off and the new Macknair one is on and ready to roll (or cut hay at least)! I ended up using a gear puller and one of those Dewalt 18v impact drivers on the end of the puller and off it came. It probably would have come off using a ratchet as well but I thought I’d try out the impact.

    That said, the bearing “housing” on my mower was held together w/ 4 bolts and I took these off as well as the 3/4″ nut on the end of the wrist pin. That let me remove the front portion of the bearing housing. I think some mowers might still have the bearing housing riveted together – I have a parts machine that looks like that.

    To get a good straight pull w/ the puller I had to undo the nut and drop the end of the “adjusting rod” thing that sits directly in front of the flywheel – no big deal. Then zip, zip and it was off. No heat needed.

    E-mail me if you need more info or I’m unclear.

    Good luck.

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