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Warming up the MCV on 706

R

Rtkman706

Member
What's the easiest way to heat up the MCV components so the system will engage? In warmer weather I can run it for a few minutes and it will kick in (whining). In this recent freezing weather I've let it run for 45 minutes but still no steering or brakes.
Space heater? Take out 5/8 plug? Snow is on the way and I'm looking for a quick option.
Thanks.
 
Take a piece of hyfraulic hose and put a male tip on both ends. Hook it up to one of your valves and tie the lever back so it pumps oil thru the hose. I would change the hyd filter too, maybe try the double filter kit from Hy-Capacity.
 
Take a piece of hyfraulic hose and put a male tip on both ends. Hook it up to one of your valves and tie the lever back so it pumps oil thru the hose. I would change the hyd filter too, maybe try the double filter kit from Hy-Capacity.
 
You may have to face the fact that there is a problem, and actually fix the MCV or whatever's wrong. Eventually it won't work at all no matter how long you let it "warm up," and eventually may be right now.
 
Provided fluid is in good condition, clean filter, and over filled some, a good (we call them nipco heater) aimed at main case will help. Like said though, you most likely need to do some repairing to make it releiable. Running it to warm up with out oil flowing through mcv pump is not good for pump(probably can't hurt it much anymore though). Hooking a hose into outlet to circulate will do nothing for you on this model as it is open center and if oil will flow through hose it is already flowing through out the system from the rear pump anyway. That does work well on the closed center systems.
 
Running oil thru a hose will help on an open center tractor. It gets things working a lot quicker on my 856 and my neighbors 1066. You can have the tractor warmed up and working good and if you let it idle for a half hour below zero the oil will actually cool down unless you lock a lever and keep it pumping thru a hose.
 
It will warm that particular valve area, will do very little for balance of the fluid as it is always being pumped from pump through the unloading valve in hitch circit and back to sump anyway.
 
If pumping oil thru a hose only warms a little of the oil how come it makes my loader work so much better than when I don't do it. Like I said if you let the tractor idle for a half hour after it has been used and oil warmed up good the oil will cool down unless you pump it thru a hose while it idles. If you don't believe it maybe you should actually try it instead of talking about the way you think it should work. My brother didn't think it would do any good either until he saw it work.
 
I don't believe it because I understand how the system works, and what you describe equates to "cartoon physics."

Oil heats up faster when it's pumped under pressure. If you just hook a hose between the two ports, and tie the lever back, very little pressure is developed and very little heat is generated. The oil just blurps out the top hole and runs back in the bottom hole, or vice versa.

In order for your scheme to work, you'd need a restrictor in the hose. That's a fitting with a tiny hole through it instead of a full pipe. They make them in straight hose couplings, and elbows.
 
You are certainly free to continue doing as you please. If it works for you fine. As far as me trying it, been there, done that, 50 years of it and still trying. Works great on closed center, doesn't change flow on open. Like another poster said, if you restrict the flow with your hose to build pressure , of course it will build some more heat. We always use that method to heat systems using a flow rater so we can watch the temp as we need it to be up to specs to do tests. Maybe you are using a small hose enough hose to create a pressure rise. Other wise, oil is just taking a slightly different route to sump. Like the length of your hose.
 
I'm using a 3/8 hose with no other restrictions and you can tell the difference like I said even after the tractor is warmed up the oil will cool back off a lot more if you don't pump it thru the hose while it idles. I don't have a primimg problem with my tractor, but the neighbor did with his 1066 and it primes a lot quicker running oil thru a 1/2 hose. Maybe it won't warm the oil in a warm shop setting, but I know it has helped in the below zero outside temps feeding cattle the last 40 years.
 
Gets kind of cold up here in west central Minn also. Have parked them outside with a hose in them also, just for expermenting. Didn't do much. I did work at Deere dealer for a few years also and it works great on their tractors with the closed center. But like I said, if it works for you, go for it. All "modern" larger tractors now days use the pressure flow compensated closed center systems and it does work well on them also.
 
I do understand the difference between closed and open center. I knew it before I got the whole lesson from my brother when he told me the hose wouldn't help. All I'm saying is I know that it helped on all the tractors we tried in a real world setting not just experimenting outside the shop. The neighbors 1066 primes way quicker and my loader works faster and smoother a lot quicker than without. Unless you know absolutely and without a doubt that it won't help the guys 706 don't try to talk him out of spending 5 minutes changing a tip and trying it. If it was so easy for it to pump the oil thru the hose when its cold why doesn't the detente hold, why do I have to tie the lever back.
 
I think you just answered your own question when you said you had to tie the lever back, (restriction), not a free flow. You could have saved a whole lot of typing if you had said that in the first place. And I did get a little farther than expermenting in front of the shop as we had several 06 and 56 through 86 series tractors with loaders on in the vicinity. Poster asked for suggestions and several joined in with their opinions, that is all . No offense intended from here.
 
No offense intended from here either, but if you look at my original post at the bottom you'll see I said you had to tie the lever back.
 
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