Trick to keep quick connections locked together?

[CADplans]

To insure this does not happen again,, simply "T" in a relief valve in the return line,,
if the hose pops out again, the relief valve will dump.
Nothing will be damaged,, except a very small amount of oil.
Set the relief valve at some pressure above the system operating pressure.
You do not even need a gauge,, if the relief valve leaks in normal operation, adjust the valve for higher pressure.

Liquid is non-compressible,, that is good,, but, that can be bad, also,,
you happened to find one of the "bad" things about a liquid.

This is EXACTLY how a "RAM PUMP" works,,

The relief valve will be cheaper than looking for some quick connect solution,,
and you will be POSITIVE that your new valve will be protected.

 

[Snowlan]

Is that the oring poking out?

Good catch, I believe it is. The question is, did the oring blow out because I tried to move hydraulics while the return line was disconnected?

Dealer is saying this probably won’t be warranty on day 2 of operation/ownership because the hose was off.

Problem with the other comment above about the hose shouldn’t be able to come off while pressurized - this is a 3 hose setup and this hose is not one that is always pressurized. The other two hoses make the loop, from my understanding this hose only has flow while a move is being made on the backhoe.

I have a hard time believing that a hydraulic system should be this vulnerable to damage when a hose comes off, what are other’s opinion on this?

 

[CADplans]

I have a hard time believing that a hydraulic system should be this vulnerable to damage when a hose comes off, what are other’s opinion on this?

Absolutely the system is vulnerable,,
Very often, the hydraulic pump is destroyed when something like this occurs.
(You might want to have your pump checked, to make sure it is not also damaged)

The "three hose system" is power beyond,, you basically had a plug put in the power beyond port.

Some people put a plug in the power beyond port, not knowing a hose is needed.
They run into this exact situation,, something has to release,, in this case, it was your valve.

 

[sea2summit]

Good catch, I believe it is. The question is, did the oring blow out because I tried to move hydraulics while the return line was disconnected?

Dealer is saying this probably won’t be warranty on day 2 of operation/ownership because the hose was off.

Problem with the other comment above about the hose shouldn’t be able to come off while pressurized - this is a 3 hose setup and this hose is not one that is always pressurized. The other two hoses make the loop, from my understanding this hose only has flow while a move is being made on the backhoe.

I have a hard time believing that a hydraulic system should be this vulnerable to damage when a hose comes off, what are other’s opinion on this?

Most likely immediate failure will be at the oring and easiest fix, if screws were bent it's probably going to be more significant though.

So I'm not sure how a three hose system works, with a two hose there is built in bypasses on most so you don't over pressure the system. If you need a third hose for return fluid then it's going straight back to the tank? If that's the case I guess it could potentially get knocked loose because it would only have pressure when there is flow but I'd still find it hard to believe it could get freed as you described.

Also sounds like your dealer needs a boot upside his head.

 

[4570Man]

Are you sure that nothing hit the collar on the fitting and released it?

 

[CADplans]

Also sounds like your dealer needs a boot upside his head.

If you crash your Lamborghini into a pole on day two of ownership,, is it the dealers fault?
This was an accident,, and possibly caused by the person who installed the backhoe.

Improper routing of the hose may have caused this,, much like routing the car into the pole.

 

[TMGT]

Absolutely the system is vulnerable,,
Very often, the hydraulic pump is destroyed when something like this occurs.
(You might want to have your pump checked, to make sure it is not also damaged)

The "three hose system" is power beyond,, you basically had a plug put in the power beyond port.

Some people put a plug in the power beyond port, not knowing a hose is needed.
They run into this exact situation,, something has to release,, in this case, it was your valve.

It appears the return to tank line came off which will over- pressure the valve body, it will not deadhead the pump, the system/valve body relief will still be functional in this case.

It sounds like there isn't anything wrong with the QC other then being in the wrong place where it could get bumped. Since it's the tank return there won't be any pressure in that line while operating and will be easy to release.

I would look for a solution to keep the hoses in check, a velcro strap can be used to tie the hoses up and keep them from contacting something that might release the QC. Other option would be wrap the QC with something, or change out to Flat Face couplers which often have a smaller sleeve and a detent ball that has to be lined up in order to release.

 

[LD1]

Maybe everyone missed it but he said the collar (on the female fitting) was resting on a ledge. The weight of the hose and driving the tractor (bouncing around) slid the coller back and the hose popped off. That ledge was acting like your hand when you pull the collar back to disconnect the backhoe.

The fix is secure your hoses (with zip ties or bungee cords) so that doesnt happen. Because they DONT just come apart on their own unless the collar is shifted like when disconnecting.

And yes.....with that hose uncoupled, it is very easy to blow the valve. The "tank" ports and passages are NOT designed for high pressure. And failure of the valve like you had is exactly what happens. Looks like you blew an o-ring out that seals the spool valve to the casting....that filled the can with oil. And 2500psi of oil inside that can does exactly what you pictured.

Note that no damage occurred until you attempted top move the backhoe's hydraulics without an open return path for the oil to get back to the tractor/tank.

 

[TMGT]

Maybe everyone missed it but he said the collar (on the female fitting) was resting on a ledge. The weight of the hose and driving the tractor (bouncing around) slid the coller back and the hose popped off. That ledge was acting like your hand when you pull the collar back to disconnect the backhoe.

The fix is secure your hoses (with zip ties or bungee cords) so that doesnt happen. Because they DONT just come apart on their own unless the collar is shifted like when disconnecting.

And yes.....with that hose uncoupled, it is very easy to blow the valve. The "tank" ports and passages are NOT designed for high pressure. And failure of the valve like you had is exactly what happens. Looks like you blew an o-ring out that seals the spool valve to the casting....that filled the can with oil. And 2500psi of oil inside that can does exactly what you pictured.

Note that no damage occurred until you attempted top move the backhoe's hydraulics without an open return path for the oil to get back to the tractor/tank.

Not everyone

 

[workinonit]

I didn't either but I also didn't completely understand until I saw the pics that the couplers are not like a JD. Mine have no collar and are not that hard to release.