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bent hold pins-mf65 hydraulic pump

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kazenza

04-02-2006 10:21:15

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When I bought this tractor, the lift wasn't working. When I pulled the lift cover, I found the hold pins that keep the pump in place were bent forward. See the link below. Should I assume this is the source of my hydraulic problem and not rebuild the pump, what could cause the pump to get shoved forward with such force to bend the pins like this, and should I worry about damaging the diff case when I remove these? I really wasn't expecting to see this when I opened the case. Randy

www.redlet.com/bountiful/bentpin.htm

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DavidP, South Wales

04-02-2006 15:54:29

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Re: bent hold pins-mf65 hydraulic pump in reply to kazenza, 04-02-2006 10:21:15

Hi Randy,
Nice photos. Bending of the pins is rare but usually happens when the pump plate holes wear or the casting is broken. I would suggest that you have a look at the PTO shaft for any signs of damage or bend. I think that something has forced the shaft forward which in turn has pushed the pump forward. A drive shaft bottoming on a heavy implement can cause this. I had the same thing on a brand new MF compact that had done about 20 hours. It smashed a bearing inside and fortunately that was all. You may find that the circlip on the shaft bearing has sheared. The lift may not work if the stack pipe is out of line and leaking oil. The easiest way to remove the shaft is with a slide hammer of some sort. Keep us posted.
David

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kazenza

04-02-2006 10:58:38

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Re: bent hold pins-mf65 hydraulic pump-pictures in reply to kazenza, 04-02-2006 10:21:15

Here are the pictures of what I'm lookin at:

third party image

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DavidP, South Wales

04-03-2006 14:06:53

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Re: bent hold pins-mf65 hydraulic pump-pictures in reply to kazenza, 04-02-2006 10:58:38

Hello,
A difficult problem this one. Is there any evidence that the tractor has been split between the gearbox and centre housing? A possible cause might be that if it has been seperated someone has tried to reinstall it and used bolts to pull the two together. Clearly now the pump has been forced backwards, this would account for the PTO shaft turning all the time as the shafts would be butting. Past problems have occurred where the pump has tried to turn and broken the casting but there has been no sign of backward movement. It also used to rattle something awful.
Please keep me posted.
DavidP

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kazenza

04-03-2006 16:22:13

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Re: bent hold pins-mf65 hydraulic pump-pictures in reply to DavidP, South Wales, 04-03-2006 14:06:53

It was definitely split at some point because there is silicon gasket material where the two meet. That could explain why it was pushed back so evenly and straight if that's what happened. Agco wants to charge me $50 for replacement pins, and I'm having difficulty finding the rear pump body section. Everyone just wants to sell me whole pumps. I may do a separate appeal above for the pump piece. I think I can get used pins locally. Question: if the hole in the differential case is now out of shape from drilling out one of the pins, am I in trouble once I replace the pins. Seems like once it is bolted down, I should be pretty safe, although I might need to beef up the gasket there. Randy

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DavidP, South Wales

04-04-2006 11:42:12

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Re: bent hold pins-mf65 hydraulic pump-pictures in reply to kazenza, 04-03-2006 16:22:13

Hi,
Neither of my non-genuine suppliers list the pump end plates so it may well only be an MF part. If you can buy a rebuilt pump at a reasonable price or buy one and overhaul it yourself that might be the answer. Where the pins go through the side of the centre housing, are the holes significantly larger than the pins? If so there are modified pins available which are shouldered and fit the hole better, but again appear to be an MF part.
Dheers
DavidP

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kazenza

04-04-2006 14:36:01

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Re: bent hold pins-mf65 hydraulic pump-pictures in reply to DavidP, South Wales, 04-04-2006 11:42:12

I double checked the opening and its a little oval on the outside, but the end of the bent pin fits quite snug through the rest of the opening. Oddly, the same pin fits more loosely through the other side, which it was in originally.
I'm trying to scrounge a used pump, preferebly not running to keep the price down, that I can mix with mine and rebuild into a functional unit. Other than that I'll have to go rebuild. Randy

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kazenza

04-02-2006 18:56:49

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Re: bent hold pins-mf65 more pictures in reply to kazenza, 04-02-2006 10:58:38

Here's what I found. Casting where pin enters pump body has broken off. Teeth on all the shafts look fine as do all the bearings I can see at this point. PTO shaft is straight. I don't know if this is how far the drive shaft is supposed to stick out of the transmission or not.

The PTO worked on this when I bought it, but it turned all the time slowly in neutral, which I assume is related to this problem. Pump turns freely and seems otherwise fine. I assume I have to replace that front casting on the pump and should probably rebuild the pump if I can find a replacement piece.

Any guidance on my next steps. Should I open up the transmission and look for anything awry in there? It shifted fine before I tore it down. Should I just buy a rebuilt pump at this point, since the cost of a used piece or pump and rebuild kit is I'm sure heading north of $200 at this point. Any help appreciated. Randy

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