A couple of loader hydraulic questions

[Kernopelli]

OK, I figured out that my control valve does not have a relief valve built in (apparently, my ford 1220 control valve relied on a relief within the tractors system). Can I buy an adjustable relief valve with 3 ports and put it inline on the "in" line before the control valve and plumb the 3rd port to a "t" in the return to tank line coming out of the joystick control. Sound reasonable?

Darryl

 

[Soundguy]

I have seen some systems use a seperate relief, similar to what you are saying.. Plumb relief port to tank/sump line.. and then plumb out of r-valve to in of loader valve.. etc. Not ideal.. but then.. WAY better than deadheading anything..

Soundguy

 

[Farmerford]

Darryl:

I put a Prince three port adjustable relief valve into a circuit like you propose and it must have opened a zillion times in the past several years without a problem. It is awkward to do the plumbing, but once installed it seems to work as well as the ones built into the pumps on my other equipment.

 

[john_bud]

go to

www.baumhydraulics.com

they have diagrams of ways to plumb.

jb

 

[RonMar]

So who assembled this combination of pump, loader, valve ect without providing for a safety relief/system pressure regulator? That is a good way to get someone hurt. A ruptured hose or pipe can spray a jet of oil that will penetrate clothing and skin causing very serious tissue injuries that will have difficulty healing.

I made some assumptions(properly engineered installation) when I made my earlier suggestions for checking system pressure. I am terribly sorry about that.

 

[Steve_Miller]

I'm going to go out on limb here and say that one of those covers on the valve is a relief. Not very often a valve like that will come with no relief, it may just be set at it's maximum relief which is also unusual. Curiousity would get he better of me and I would have it opened up by now. If your tractor has a hydraulic 3PH then the sucker would lift anything in its path with no relief on the hydraulic system.

Steve

 

[Soundguy]

I'm with ronmar on this one. Who cobbled this system up where you have a spool valve feeding from the pump with no relief betwixt them?

This some previous owner monstrosity?

Usually when i hear of a loader and a lack of a relief problem I think "chinese". The have a fondness for plumbing quick connects right after the pump with no provision for relief.. i secretly think they just like selling new hyd pumps.. cause it is a pretty' hokey engineering concept.. even if they are trying to make a bargain basement tractor and save a few yuan... I mean.. as cheap as their component parts are.. how much would one more hose and a relief valve cost???

Soundguy

So who assembled this combination of pump, loader, valve ect without providing for a safety relief/system pressure regulator? That is a good way to get someone hurt. A ruptured hose or pipe can spray a jet of oil that will penetrate clothing and skin causing very serious tissue injuries that will have difficulty healing.

I made some assumptions(properly engineered installation) when I made my earlier suggestions for checking system pressure. I am terribly sorry about that.

 

[Kernopelli]

Actually guys......I put it all together. I built my FEL myself, I found an old Freeman trip bucket loader at our local salvage yard. It had the original trip bucket, arms and subframe for a considerably larger tractor than mine. I was able to use the metal from the original sub frame and cut it all up and fabricated a frame for my tractor, I cut length off each end of the arms and cut sections out of the width, welded it all back together, installed proper pins and bushings and made the bucket. I bought all the cylinders and the control valve off Ebay. The valve was NOS from a dealer and I got it for a song. The valve came with all the plumbing and quick connects for a Ford/NH ,1220 tractor. I got into the valve after discussing it earlier in this thread and couldn't find a relief cartridge so I contacted the seller and he supplied my with schematics for all the Ford valves and explained :
""All of the Ford (New Holland) 20-series tractors used the same valve, except the 1220 valve relief port
had a plug installed. They started with Zexel and switched to Kayaba in
later production, but basic function is identical. I don't think that these
valves share any internal components. The 1220 models used full system
pressure for loader, but the 1320 and bigger had a relief valve to clip
system pressure for loader operation."""

I knew before hand that this valve was produced specifically for a 1220 and although I own a Mitsubishi tractor ( grey model CIH 254) wasn't worried about it since I assumed every valve had an internal relief valve, it never occurred to me that it was possibly otherwise. This was originally a $700 valve package from Ford and is a joystick w/ PBY and I (AS*)umed it would work with no problem. SURPRISE!

Well, My loader has turned out great, I only have about $400 whole thing ( in the loader that is.......... the $350 pump replacement kind of negates all that!), it looks pretty factory (except I haven't sandblasted and painted it yet-that's a winter project) and is way more sturdy than my needs require, hence even more need for a relief system.

I am going to get a 3 port relief and go that route. I already had a Baum Hydraulics catalogue and forgot there were plumbing diagrams in it, so maybe even I can figure it out now . I'll get the valve from one of the other suppliers though- Baum seems to sell most everything at a high premium but they do have things you can't find just anywhere.

I appreciate all the help and now I will sleep better knowing we have saved some other poor soul the heart ache of buying an antiquated Ford NH 1220 valve and putting it on their cobbled up loader ( like anyone else would ever have this problem).
Thanks to all,

Darryl

 

[MikesTractor]

Darryl,

I have used a separate relief on several different jobs. The one that I usually use comes from Northern Tool. Northern has 2 different sizes. The valves are basically the same. The only difference is port size. One is 3/4" and the other is 1/2". Both are fully adjustable

They are simple to plumb in. As you suggested, you put it in the pressure line between your pump and valve. The third port is routed back to the hydraulic tank in some way. If your return line goes directly back to the tank, then you can tee into this line.

Here is the link for these relief valves.

Nothern Tool

Maybe this will help.

Mike

 

[Soundguy]

Darryl.. as you found out.. not all ford valves have reliefs. I have 2 ford valves at home that rely on the relief built into the tractor hyd lift cover.. thus there is no integral relief valves built into the spool body.

Soundguy