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What holds a dog bone in?

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48nTom

08-28-2002 12:08:11




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After some quirky lift problems, then the thing giving up all together, I replaced the pressure relief valve. I tried to replace it through the inspection cover, but couldn't get it loosened with all the oil in there. When I drained the oil, I found both ends of a broken bolt. I have pulled off the hydraulic unit (the unit under the seat) and it appears this grade 5 bolt was holding the bone in place. My question is, the bone's hole is much larger than the holes in the socket (pardon me for not knowing it's correct name) in which the bone sits, what really is supposed to be used to hold the dog bone in? Might I have another problem preventing the lift from working?

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George (KY)

08-29-2002 21:20:20




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 Re: What holds a dog bone in? in reply to 48nTom, 08-28-2002 12:08:11  
When you pulled the hyd.lift assy. was the piston at the top of the cylinder or all the way at the bottom(fwd end)?



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48nTom - it's working - kinda. . .

08-30-2002 04:58:45




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 Re: Re: What holds a dog bone in? in reply to George (KY), 08-29-2002 21:20:20  
That's where I get confused, piston was all the way into the cylinder. I did get the rod reinstalled, and the hydraulics work to the point of lifting themselves and will hold up a load (me), but they won't lift me (I'm about 175). Prior to me replacing the Clevis, the arms would not move. I'm guessing pump problems, because it is jerky as it raises (I'm in the process of searching the archives now). The hydraulic unit springs and linkages checked out according to the owner's manual. I get way more than 5 gallons of oil out of this thing, too, probably closer to 6 - a bit tricky with a 5 gallon bucket under there!

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ZANE

08-29-2002 05:00:07




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 Re: What holds a dog bone in? in reply to 48nTom, 08-28-2002 12:08:11  
If the dog bone was still in place in the rocker it had nothing to do with the problems with the lift.

If it is a 9N/2N I would look at the spring that is between the ram and the control rods to make sure it has enough tension to pull the control valve in and out. These springs loose tension with age and they must be tight enough to move the control valve should it try to stick etc.

Zane



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48nTom

08-29-2002 05:19:44




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 Re: Re: What holds a dog bone in? in reply to ZANE, 08-29-2002 05:00:07  
What if it is an 8N?



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George (KY)

08-28-2002 13:55:49




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 Re: What holds a dog bone in? in reply to 48nTom, 08-28-2002 12:08:11  
The part number is 74034-S a 5/16 x 2-1/8 Clevis pin. the hole is larger in the rod( dog bone) because the cylinder is not in line with the ram arm



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48nTom

08-29-2002 05:30:41




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 Re: Re: What holds a dog bone in? in reply to George (KY), 08-28-2002 13:55:49  
Thanks for the info George.

As far as Zane's response, I'm not sure if it was in place, it fell out as soon as I lifted the unit from the tractor. I'm hoping it isn't the pump, but fear it is. Doesn't make sense to me it didn't lift - IF it was in the right place, but I really don't feel like paying a shop to rebuild the pump and then finding out it was the cylinder rod being disconnected! The bore of the lift cylinder looks really nice, and the piston seems to have a good seal.

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Mountainman

08-29-2002 13:00:21




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 Re: Re: Re: What holds a dog bone in? in reply to 48nTom, 08-29-2002 05:30:41  
If it were mine I'd fix the dog bone problem and any other visable issues, then replace the hyd unit and give it a try. If you have the pump out still, take it apart and have a look. Willy-N posted a great photo of all the pieces - not that complicated. The FO - 4 has a good section on rebuilding the pump. Even if you have to take it to a machine shop for some things, having it apart will save you $ and you will know more about what makes your tractor tick.
Zane makes a jig that allows you to adjust the internal linkage correctly the first time. It includes the follower pin that is usually the first thing to wear out.

Mountainman...CA

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