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Gresen Minneapolis 2 spool control valve leaking.


 
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Ryanz336
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PostPosted: Thu May 27, 2021 1:29 pm    Post subject: Gresen Minneapolis 2 spool control valve leaking. Reply to specific post Reply with quote

1968 ford 4500 with the 755 backhoe and 740 loader attachment. Control valve for the loader is leaking out of one of the two bowls. There is a pin hole on the end of the bowl, but only on the bottom bowl. Is it a weep hole or is it a damaged bowl? I have no clue. Attaching pictures, you can barely see the hole in the very middle of the bottom bowl. Any advice is appreciated. The pin hole is between the letter E in Gresen and the E in Minneapolis on the bottom of the bowl.








 
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wore out
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PostPosted: Thu May 27, 2021 9:04 pm    Post subject: Re: Gresen Minneapolis 2 spool control valve leaking. Reply to specific post Reply with quote

What you are calling bowls are simply covers over the spring that centers the spool when you take your grubby paw off of the lever, the longer one likely allows for a float position of the lever.

The seals are inboard of that, either O-rings or quad rings that reside in a groove in the spool or a groove in the valve body casting.

IIRC, Gresen is now a part of Eaton, a good hydraulics shop or on-line supplier will know what you need.
 
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Ryanz336
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PostPosted: Fri May 28, 2021 10:52 am    Post subject: Re: Gresen Minneapolis 2 spool control valve leaking. Reply to specific post Reply with quote

Thanks for your comment,
I was asking if the cover is supposed to have a hole in the end of it? That's where it's leaking from. Is it supposed to be there or is the cover damaged?
 
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Jim.ME
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PostPosted: Sat May 29, 2021 3:20 am    Post subject: Re: Gresen Minneapolis 2 spool control valve leaking. Reply to specific post Reply with quote

CVPost-Ryanz336 wrote:
(quoted from post at 14:52:54 05/28/21) Thanks for your comment,
I was asking if the cover is supposed to have a hole in the end of it? That's where it's leaking from. Is it supposed to be there or is the cover damaged?


I believe some may have had a hole in them. Is the hole round like it would be if drilled? Does it show wear when you look at the inside?

To wore out's point; the cap covers the centering spring and detent for float in that valve. Even with a hole in it it is not the source of your leak. In the drawing linked below, part item key numbers 24 and 29 seal the spool, the cover only holds them in place.

https://www.mycnhistore.com/us/en/newhollandce/tractors/agricultural/34-cyl-65-75/3-cyl-industrial-tractor/hydraulic-systems/control-valve-assembly-4500-65/cn/044FC5C9-B8BF-E111-9FCE-005056875BD6
 
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Ryanz336
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PostPosted: Tue Jun 01, 2021 9:21 pm    Post subject: Re: Gresen Minneapolis 2 spool control valve leaking. Reply to specific post Reply with quote

Thanks for your reply. I understand
everything you're saying. Haven't taken the
cover off yet to inspect, but it is
Definitely leaking hydraulic fluid from the
pinhole. I start the tractor, run it for 5
minutes and eventually fluid will pour out
of the hole on the face of that cover until
I turn the tractor off. I'd imagine it has
bad seals inside of the cover. I'll take a
look tomorrow and update.
 
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