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Re: 641 still loses Hydraulics prime

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Author  [Modern View]

11-25-2013 06:41:37

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Hi Bill,

I was reading you other post about your pump too. Its starting to sound like have blown the seal on your pump. Usually that seal will wear a groove in the wobble shaft to. When that happens, your pump pulls air instead of oil into the pistons. If you want to try to replace that seal you can do it without special tools, but it will take a shop press.

I would plan on replacing the wobble shaft, bearing cup and cone, needle bearing and seal. They are all available after market for a reasonable price.

Getting the seal out is the hard part, it is behind the bearing cup that is pressed in. You can use a welder an put a bead of three on the cup and it usually pops out or grind the cup down to nothing in several places than hook that cup out. One that is done you get the seal and needle bearing out. They all press back in. The wobble shaft has the bearing pressed onto it, that is where the shop press comes in.

If you are up to it, we can help.

Also, I saw the post about gear shearing the key and spinning on the wobble shaft. That's easy to check with the pump off, did you check it when you overhauled the valves?


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William Fissell

11-25-2013 06:52:43

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 Re: 641 still loses Hydraulics prime in reply to Kurt-NEPA, 11-25-2013 06:41:37  

thanks for your reply.

- I think I have the "ball bearing" pump, not the "roller bearing" pump, if that matters.

- I didn't disassemble the wobble plate, but I did grab the gear and the wobble plate and they seemed locked together pretty well.

- I have the FO-20 and the Ford manual.

- Will re-tear it down.


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