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  1. #1
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    Could anybody help with a Haybob please ?

    I have run many Haybobs over the years but have just rescued an older one from the nettles ! I have a problem insofar as one of the depth wheel stalks is seized. I have extracted the handle at the top and also the insert. Some Neanderthal has even smacked it with a sledge to try and move it.

    My question is how do I dismantle the whole thing ? Is it just a case of undoing the large nut on top of the crownwheel housing and everything, including the rotor, drops out, or do I undo the studs that are underneath the rotor ? Or both ? I do have a spares book and can see what's inside but just not sure how to proceed. Thanks for any help given.

    wheel.jpg

  2. #2
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    Re: Could anybody help with a Haybob please ?

    It is supposed to just drop out when the pin at the top is removed. A tap with a sledgehammer will have swollen the end so that it will not fit down the hole anymore.

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    Re: Could anybody help with a Haybob please ?

    Penetrating oil.......never hit it on the end........big Stilson or pipe grips below the housing and twist. + time.
    Suppose you could take the wheel off and weld attach a long bar below the housing to apply even more force.
    No knowledge of the internals.

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    Re: Could anybody help with a Haybob please ?

    Quote Originally Posted by Gee View Post
    Penetrating oil.......never hit it on the end........big Stilson or pipe grips below the housing and twist. + time.
    Suppose you could take the wheel off and weld attach a long bar below the housing to apply even more force.
    No knowledge of the internals.
    Thank you. Yes, going to de-tine it today because most of the PZ99 & PZ100 springs are shot and then turn it upside down and then WD40 underneath for a few days.

    I have a large set of Stilsons that I can use (with a length of pipe if necessary ) but I hadn't thought about welding a length of something on to the stalk. I'll see how it goes and report back.

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    Re: Could anybody help with a Haybob please ?

    Quote Originally Posted by Barney View Post
    It is supposed to just drop out when the pin at the top is removed. A tap with a sledgehammer will have swollen the end so that it will not fit down the hole anymore.
    Thanks for that. I have been advised not to allow the whole lot to drop out. That upsets the timing, backlash etc. of the crownwheel and pinion. I have ground the top of the stalk so the swollen part has now gone and I have loosened the big nut but I don't really want to take the whole lot apart, all I want to do is to free the stalk so that I can adjust the height of the wheel.

    I have been copiously dowsing the area between the stalk and it's sleeve with WD40 and I have been advised to turn the thing upside down and do it from the underneath as well.

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    Re: Could anybody help with a Haybob please ?

    Quote Originally Posted by zaza View Post
    Thanks for that. I have been advised not to allow the whole lot to drop out. That upsets the timing, backlash etc. of the crownwheel and pinion. I have ground the top of the stalk so the swollen part has now gone and I have loosened the big nut but I don't really want to take the whole lot apart, all I want to do is to free the stalk so that I can adjust the height of the wheel.

    I have been copiously dowsing the area between the stalk and it's sleeve with WD40 and I have been advised to turn the thing upside down and do it from the underneath as well.
    I find Balistol (made in Germany) much better than WD40; less volotile & a better lubricant. I've heard that the best penetrant is a mix of ATF and acetone; no experience of tho'.

    I'm guessing that the real problem will be accumulated rust jamming the two parts and if so rotating back & forth might be the best way to loosen it, break up the rust particles and perhaps let the stalk drop out - but I reckon you'll need a long handle on the stillson. What about slipping a piece of pipe over the stub axle and using that as a lever?

    Some heat on the stalk probably wouldn't hurt.

    JV
    Agtronix - the home of the Weedswiper

  7. #7
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    Re: Could anybody help with a Haybob please ?

    Thanks John. Well, I turned it upside down after de-tining it. No two bolts the same on the tines so that was a gas axe job I did just put a big pair of Stilson on the stalk and a length of 2" water pipe on the end of those and I thought that I'd shifted it but it was the sleeve as well as the stalk that moved. So now I have to anchor the sleeve and I think I know how to do that because there is a boss on the bottom of it which I can utilise. Trouble is, there's quite a large bearing in close proximity to the boss so I will not have to get carried away. You can probbaly guess what the plan is.

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    Re: Could anybody help with a Haybob please ?

    Quote Originally Posted by zaza View Post
    Thanks John. Well, I turned it upside down after de-tining it. No two bolts the same on the tines so that was a gas axe job I did just put a big pair of Stilson on the stalk and a length of 2" water pipe on the end of those and I thought that I'd shifted it but it was the sleeve as well as the stalk that moved. So now I have to anchor the sleeve and I think I know how to do that because there is a boss on the bottom of it which I can utilise. Trouble is, there's quite a large bearing in close proximity to the boss so I will not have to get carried away. You can probbaly guess what the plan is.
    Sorry, my brain is on slow speed today; no idea what your plan is .

    Looked at my machine today, and there is certainly a risk of the tines clashing if the timing is incorrect, but I think there must be a fair bit of latitude. Similarly, although I haven't seen inside the gearbox, I'd have thought getting backlash correct would not be a huge problem.

    Considering those points, I'd be inclined to undo the big nut & drop the lot. Then maybe you could get some heat on the tube, coz I reckon you'll need it

    JV
    Agtronix - the home of the Weedswiper

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