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Leaving FEL up causes increased pressure in return hydraulic

C

corvetttteguy

Member
I have a new to me 4600. But I also have
a cub cadet 7532 FEL/Backhoe.
A hose failed on return pipe off the filter.
To my surprise the two joined pipes
have different OD's. 1.25 and 1.0.

I dumbly have usually left the bucket up
when put away. (NO MORE)

DID I CONTRIBUTE TO THE HOSE BURSTING?
IS THE PRESSURE INCREASED BY THE IMPLEMENT WEIGHT?

Believe it or not a new Cub hose ($26) is only
a 1.25 OD.. How can it seal???
 
Return line would have NO pressure with loader either up or down.

Perhaps the hose just "rotted" and failed?
 
It looks like it burst.
I first used the original hose and moved
it so the hose clamp was over the break.
That slowed down the leak when motor off.
However, the leek stopped when I relaxed the FEL
and 3 point lifts.

It tells me that there becomes pressure when not running
and implements and FEL raised.
Like the entire system becomes increased pressure.
 
There would be very little pressure on a hose with the bucket up, unless it were loaded to capacity. If you need
to leave it up for some reason you should put a post or adequate support under it, as most will slowly settle, and
it could be dangerous if children were playing on it.
 

Was this on your John Deere or Cub? Did the Loader drop to the floor or onto something?

I agree with Bob, the return line would not have pressure on it just because the FEL is up. The control valve "locks" the oil in the cylinders when the loader is up so there would be no oil going to the return when the engine is off, except maybe some bleed off, if your control valves have some wear and are leaking by. When the engine is running the return sees any flow not needed to run a function. Return piping/hoses are usually larger diameter so pressure should be low even for that flow. The pressure would go up in the return circuit only if a restriction developed prior to the reservoir. Just my thoughts.

As Russ noted use mechanical safeties if you need to leave it up. It would be more likely for someone or something to hit a lever, more than a system failure, causing it to drop.
 
I used to leave it up for no good reason,
at 71 years old there are no kids running around.
But now I will lower all hydraulics on shutdown.

The problem was on the cub. The JD4600 is 1 week old for
me and I plan to use it for my wife to brush hog the
semi flat fields. I still have to pick up two implements
that came with it, a 72 woods box blade and a 72" Harley rake.

Since the Deere came originally with a FEL the
front hydraulics is still there. If I ever get
the Harley working I'll need it.

19816.jpg


Here is my attempt to make a 15 year old machine
look presentable. It will probably become a
mower queen under my wife's guidance.
 
It is always prudent to lower things when not in use, it is real easy for anyone to come along and drop hydraulics, not so easy to start engine and raise back up.
 
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