New hydraulic valves on front end loader

Mtjohnso

Member
Tractor-Satoh Mitsubishi Beaver
Hydraulic pump replaced 4 years ago
Original valves Cessna 30922-300
New valves Nortrac 45463
2spool valves
Old valves replaced due to leaking badly. Still raised the bucket fine and rotated the bucket fine. Just would not hold bucket in place.
Always slowly dropping.
Ordered new 2 spool valves from Northern Hydraulics and installed.
Bucket will raise up and bucket rotates fine just a little slower.
When i put a full load of dirt or gravel on bucket it does not raise
unless I give tractor full throttle.
Not sure how many gpm old valve was, new one is rated for 12gpm
but manual states 8gpm and 1000psi setting at factory that is
adjustable.
Put pressure gauge on input line and at idle gauge shows about 100
psi and when bucket raises it goes up to 500 psi. When bucket curls
it goes to 800psi.
So why will the bucket not raise up as it did originally? Is it just a
pressure adjust on the valve, valve bad, wrong valve.
Cannot find a lot of info online for old valve.
 
Most newer hydraulic systems operate a lot higher pressure. You will need to find out what your tractor should be at. My IH 560s can be around 1600. Newer tractors over 2000. Good luck
 
You're right, there's not much info on older hydraulic valves online. There are just so many of them and just not enough interest. Manufacturer not interested in wasting resources keeping data on obsolete parts available.

These valves are pretty simple. No magic going on inside. All they do is divert the oil from one hole to a different hole.

Really the only thing you can do wrong is mix up the IN and OUT ports. Running the oil through the valve backwards can result in some oddball behavior.

When you say GPM and PSI is adjustable, WHERE is that adjustment? At the tractor, or in the valve? I have never heard of a valve where GPM is adjustable.
 
What is the pressure when you fully extend or retract the cylinder and keep putting the pressure to it? If it stays low I'd adjust the pressure up higher on your new valve. I had to almost bottom out the adjustment on my add-on valve for the Farmall M. I never checked the pressure but that's what it took to equal the same lift as the old valve. I just wanted more spools.
 
I adjusted the pressure relief screw till it reached 1200 psi and that did the trick. It was at 800 psi before I started to adjust it. So now it works great. Thanks for your help
 

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