VAC hyds not working correcty

old · Oct 21, 2016

So I have this VAC wit ha Stockton type 3 point. I have a carrier on it that I had hoped to use for deer season. So this morning one of the guys shot a 7 point buck and I took the VAC to go get it. I set the lift as for down as it goes. It goes down till it hits the swinging draw bar. So we load up the deer and I try to get it to lift but it would not lift the deer.

So now I have to figure out if it is the pump or the cylinder. Short of unhooking the hose form the cylinder and hooking up a gauge is there a way to adjust or figure out if it is the pump or the cylinder?? Neither one appear to leak any place and the cylinder is a single acting cylinder.

C. Amick · Oct 21, 2016

Is it a belt pulley pump or an engine driven pump? Sometimes on the belt driven pumps the pin shears on the collar where the control rod connects. There is a pin that goes through the collar and shaft. The collar turns the shaft to raise and lower the lift.

old · Oct 21, 2016

It will raise and lower when I move the control and it will lift me standing on the 3 point and will raise an lower to carrier. But when we put the deer on it would not lift the deer and the carrier. I can also with it running raise it and then stand on the carrier and it stays up just fine but when I shut it off it will slowly lower over time

Bhunt · Oct 21, 2016

Here's a pic of my cylinder off the SC don't know if tours is the same. when I bought the tractor the oil was a little milky I sealed the top of the cylinder to keep water out. Now that I have the tractor torn down I opened the cylinder and its all corroded. Could be your issue because mine was still working if you can believe it but it did leak down after time.

C. Amick · Oct 22, 2016

The spring on the pressure relief bypass in the belt pulley pump might be weak. Someone had shimmed the spring in the pump on my dad's VAC when he bought it. They shimmed it with something too thick. It ended up building up so much pressure that it cracked the pump housing before we knew that the pump had been modified.

old · Oct 23, 2016

Where is the relief valve on it?? I know there are a couple of what looks like pipe plugs facing the rear of the tractor but not sure if one of those would be where it is

C. Amick · Oct 24, 2016

The bottom plug is where the spring loaded relief valve is located.

old · Oct 24, 2016

Guess I'll have to try to remove it from the one I have in the house and take the spring form it an put it in the one on the tractor and compare the 2 springs and see if one seems weaker then the other one

C. Amick · Oct 24, 2016

Well, I guess you could put a shim in there if you don't over do it.

old · Oct 25, 2016

I took the end washer form another pump I have and put it in the one on the tractor so there is now 2 of them and that seems to have helped a good bit. I try it before I put it in and it would not lift me when I was standing as far back on the carrier as I could and still be able to work the control. I then installed the washer sort of thing and used a wrench to push the lever so I could be back even more and it lifted me just fine. Now does it lift as much as it should I do not know since I have no idea how much weight it should be able to lift. I know on a tractor like the 8N ford it can lift around 800lbs so I would think this VAC should do close to that but not sure

C. Amick · Oct 28, 2016

Like the Ford 8N, it was designed to lift a 2-bottom plow. Not sure how much more than that?

VAC hyds not working correcty

old

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Bhunt

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