Hydraulic questions

Zachary Hoyt · Jan 31, 2013

I have a Massey 35 on which I put a 101-102 loader about 4 years ago. The loader came off a 202 industrial tractor so I had to adapt things a bit to make it fit. I used the existing valves and hoses but the valve leaks and some of the hoses are getting to be in bad shape. The loader is powered off the internal pump that runs the 3 point hitch. I am planning to add a front mounted pump and replace the valve and the hoses. I'm looking at surplus center for the parts since they seem to have the best prices. I see that pumps are rated with a range of GPM at different speeds and that valves are rated at a single GPM. Do I need the GPM that the pump could put out at the maximum speed the engine will turn it to be lower than the valve rating or am I mixed up? I have a very limited understanding of hydraulics and how to set them up. Any advice will be much appreciated.
Zach

old · Jan 31, 2013

On most farm tractors you want a hyd pump with a GPM of around 8-10 gpm having one with a lot more you can flip a tractor or wear what was in the bucket due to the loader moving to fast and you match the pump to the valve as in if the valve is rated for 10GPM then that is the size of pump that works well with it

Cliff Nelson · Jan 31, 2013

You are correct in that you want the pump to be equal or less than valve capacity at max pump rpm. Also, be sure the valve has a relief valve in it to protect the pump.

Zachary Hoyt · Jan 31, 2013

Thank you, that makes sense. Is it a problem to have a pump that is rated for 3,000 PSI and a relief valve set for 2,000? I can't see why it would but am not sure. Also I am thinking that if the relief valve is set for 2k then the cylinders or anything else beyond the valve would also be protected from seeing more than 2k, is that true?
Zach

Zachary Hoyt · Jan 31, 2013

Thank you, that makes sense. My current pump is rated about 3.8 GPM so if I was up to 8 or 10 that would make a big difference, and I would be able to run the loader and the three point hitch at the same time.
Zach

old · Jan 31, 2013

Yep. My Ford 841 has a 8GPM pump on it and even then if your not watching you can wear some gravel etc if you have it up all the way. There are add on hyd valves made for that MF35 you know that let you use the 3 point and loader at the same time but to find one may be hard and the cost maybe more then going the way you want to go

old · Jan 31, 2013

Most valve bodies have a built in relief valve in them and most are set at 2000-2500 and it is in fact better to have a pump rated for a higher PSI then the relief valve so as to protect the pump

Robert Major · Jan 31, 2013

Hi
The guys seem to have you on the right track with the hyd set up and system.
The only comment I have to add is, Most of this wearing gravel with the loader bucket right up, is probably due to the booms not having self leveling on the bucket and maybe some lack of operator control rather than pump speed.
when the bucket goes right up it tips the stuff over the back as the bucket leans back more as it goes up. on self leveling if the bucket is parallel to the ground at bottom it stays level at full boom height.
with out the self level as you lift you have to manually adjust the front edge of the bucket forward to keep level and not dump the gravel over the back.
I hope this makes sense to you, it does to me as I have been driving loaders and backhoes with and without self leveling for years.
I have also fixed many older tractor/ Backhoe loader hoods on things in my shop for guys, that have had round bales or rocks dumped on them because of no self leveling and dumping stuff over at the top of lift.
Regards Robert

Inno · Jan 31, 2013

I will have to look it up to be sure but I think the 202 had a 12gpm pump @1200RPM.......when I get back out to the shop I can look it up in my manual. I don't remember numbers too well so don't hold me to that.

Hydraulic questions

Zachary Hoyt

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old

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Cliff Nelson

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Zachary Hoyt

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Zachary Hoyt

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old

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old

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Robert Major

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Inno

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