busted pump ring

[chiefcrewdog]

Hello,

I just finished mounting and plumbing a Ford 770 loader onto my 1964 Ford 2000 today.
I primed the pump and upon starting the tractor, the main lift arms appeared to work fine. At about half mast I decided to test the bucket tilt controls and as soon as I moved the control, the bucket twitched and I heard a kind of squealing whoosh sound and saw fluid spraying up front. At first I thought I blew out an o-ring but on inspection, the ring section is cracked completely in half.

Now I confess to being a complete noob, so this may sound stupid and I apologize up front but is there any sort of over-pressure condition that could cause something this? It looks like I can buy the ring but don't want to blow a new part (or something else) I did some cursory searches but didn't uncover anything like this.

The pump is a Vickers vane-style (V2X series) mounted off the front crank and near as I can tell from the casting number on the rear cover is either 8 or 12 GpM. The pressure lines are 3/8 as is the return. I have a ten gallon tank with a strainer in the suction line (new stuff) and a filter in the return.

Education needed.

Dave

 

[chiefcrewdog]

I took apart the pump and other than the busted ring section didn't find anything that looked out of sorts. Phone Pic attached

The crack is through two small holes in the ring section and appears to be a clean break i.e. it has no discoloration indicating a partial crack.

 

[J_J]

I took apart the pump and other than the busted ring section didn't find anything that looked out of sorts. Phone Pic attached

The crack is through two small holes in the ring section and appears to be a clean break i.e. it has no discoloration indicating a partial crack.

It almost sounds like you put something in a deadhead situation. That is where the fluid from the pump has no place to go, and the pressure will build up until the weakest part of the system will break, blow out, or explode. Does you valve have a relief in it? Are all QD's connected correctly?

 

[chiefcrewdog]

I wonder on the relief valve... I simply do not know but I think the control valve may be relying on the system having one, similar to another post I read. The operator manual shows the loader being plumbed to the 3ph hydraulics. My tractor is lacking the 3ph stuff as someone removed it sometime back and put a flat plate in it's place, so I have a front mounted pump.

I didn't hold it against the stop or anything but I suppose it could have dead headed. If it did, it wasn't but for a fraction of a second. I'm not sure that it would have. Like I said, the bucket twitched and wasn't against the stops.

Not sure what you mean by QD's except maybe Quick Disconnects. There aren't anything I would call Quick to disconnect. The in and out are clearly labeled and all the other working ports appear to be correct i.e. nothing apparently working against itself.

I would have thought a hose would blow before the pump body (and I got some crappy looking hoses on it still) but stranger things have happened.

Supposing there is a relief valve the control valve, adding another won't hurt right?

 

[J_J]

I wonder on the relief valve... I simply do not know but I think the control valve may be relying on the system having one, similar to another post I read. The operator manual shows the loader being plumbed to the 3ph hydraulics. My tractor is lacking the 3ph stuff as someone removed it sometime back and put a flat plate in it's place, so I have a front mounted pump.

I didn't hold it against the stop or anything but I suppose it could have dead headed. If it did, it wasn't but for a fraction of a second. I'm not sure that it would have. Like I said, the bucket twitched and wasn't against the stops.

Not sure what you mean by QD's except maybe Quick Disconnects. There aren't anything I would call Quick to disconnect. The in and out are clearly labeled and all the other working ports appear to be correct i.e. nothing apparently working against itself. If you have a parts manual for your machine, look and make sure about the relief.

I would have thought a hose would blow before the pump body (and I got some crappy looking hoses on it still) but stranger things have happened.

Supposing there is a relief valve the control valve, adding another won't hurt right?

If you have a parts manual, check and make sure about where the relief is. There should be one in the valve or before the valve. If someone blocked the return to tank, that would deadhead it very quickly. The pump parts, flange ports, housing, they all see the spike first, and if they are weak, bang, that quick.

Teat pressures on some hose can go above 4,000 to 8,000 psi. I don't know about test pressures on pumps, but sometimes they state the continuous pressure, and intermittent pressure.

 

[chiefcrewdog]

Thanks JJ

I'll have to see if I can find an exploded view of the control valve. The Owners manual doesn't say for certain that it does or doesn't
According to the manual, there is supposed to a sticker attached to the loader frame admonishing you to not screw with the relief, which seems silly to say unless there is one.

But there are two different part #s for the control assy. and the difference just might be one with relief and another without. I searched the part no's without luck.

I didn't hear anything in your reply about adding another into the system if one already exists, so I may just do that anyway. Seems like cheap insurance, if there are no hideous drawbacks.

Thanks again!

 

[J_J]

What I said in my post was. "There should be one in the valve or before the valve. "

You can always add a relief valve to any part of a circuit, and it should be before the part you are trying to protect. You can install a fixed relief, or an adjustable relief valve. You should also have a pressure gage to set the pressure relief. You can find them here.

https://www.surpluscenter.com/sort.asp?UID=2009041404432623&catname=hydraulic&keyword=HAR1

 

[chiefcrewdog]

JJ thanks again for the assistance. I used your link to get an non-adj 1800 PSI break and some new hoses as well. No sense in bursting a hose when I get this thing working right

I found a gentleman in MO @ Knighthawk Supply who had cartridge kits for my pump at what I thought was a reasonable price. He said these rings break all the time from bonehead moves (my words) like I made.

So now I sits and waits for my dogs to tell me the UPS man has arrived. Maybe I should think a bit and take a nap?