farmall 504 hydraulic problems

farmall pete · Apr 23, 2019

Was loading manure with the farmall 504 today when the lower bolt that holds the remote valve stack together broke, spraying fluid all over. I took the stack apart and replaced the bolt. It was a grade 8 bolt, so I was surprised it would break in that situation. Put everything back together.

Now the remotes are acting funny. The levers are very hard to push and pull, and the hydraulic pump sounds like it's laboring more than usual. It has dual remotes and both are acting exactly the same.

This really screwed up my plans for the day. I took the spool out of one of the remotes, but could see nothing wrong. Is my problem up the line someplace? It would seem so since both remotes were working fine, and now neither works right.

Ideas would be appreciated...would like to take advantage of today's nice weather!

BarnyardEngineering · Apr 23, 2019

This is one of those problems that requires X-ray vision and extra-sensory perception even if you're right there in front of it.

Since both valves are acting the same logically it's a problem either upstream, or downstream, of the valves. What's upstream, or downstream of the valves? Don't know off the top of my head. I think there's some sort of pilot valve somewhere in the stream, like a 460 or a 560. I know if you get a chunk of dirt in that pilot valve or the little ball hammers the orifice enough, it can cause the pump to labor.

farmall pete · Apr 23, 2019

When I took one of the spools out, it came out harder than other ones I have disassembled. Almost like the spool was bent slightly. Can t see how that would be possible. And when I work the levers, it feels like metal on metal making them hard to move. It doesn t feel like hydraulic pressure is making them bind.

Bkpigs · Apr 23, 2019

(quoted from post at 17:20:18 04/23/19) When I took one of the spools out, it came out harder than other ones I have disassembled. Almost like the spool was bent slightly. Can t see how that would be possible. And when I work the levers, it feels like metal on metal making them hard to move. It doesn t feel like hydraulic pressure is making them bind.

You tightened the bolts too much. I think the manual only calls for like 24 foot/lbs. Loosen the bolts until the spools move freely.

farmall pete · Apr 23, 2019

Bingo! Loosened the bottom bolt that I replaced a little bit and now they work as before. I don t understand why that would make the spools bind?

Bkpigs · Apr 23, 2019

They had to have a reason for having it setup that way. Still can't figure it out though.

Bob · Apr 23, 2019

(quoted from post at 11:20:18 04/23/19) When I took one of the spools out, it came out harder than other ones I have disassembled. Almost like the spool was bent slightly. Can t see how that would be possible. And when I work the levers, it feels like metal on metal making them hard to move. It doesn t feel like hydraulic pressure is making them bind.

You don't mention taking the stack apart to replace the O-rings between the sections.

Very possibly, one or more of them pushed partially out of place and is pinched between the sections, "cocking" them a bit when you tightened up the new bolt.

Bkpigs · Apr 23, 2019

(quoted from post at 18:00:27 04/23/19)
Bingo! Loosened the bottom bolt that I replaced a little bit and now they work as before. I don t understand why that would make the spools bind?

Sorry, I read your reply wrong. With that tight of clearances between the spools and bodies, it does not take much deformation in the body to cause them to bind.

farmall 504 hydraulic problems

farmall pete

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BarnyardEngineering

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farmall pete

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Bkpigs

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farmall pete

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Bkpigs

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Bob

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Bkpigs

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