loader hyd couplings

[powersrp]

i have a B3350 with a la534 loader, 4 hoses too hook up to tractor, after cleaning and flushing the couplers i still cant get the top or the bottom couplers too lock in(there are 4 total inline behind the loader frame and are a bitch to get to) any ideas? or do i need new couplers? tractor is a 2014 and
couplers are not damaged


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[Dieselbob]

Are you sure there is not any pressure in the lines? The couplers will not connect if there is still pressure built up in them. Sometimes I have had to burp the plunger in the couplers.

 

[D2Cat]

What Bob said. Before you disconnected the lines did you move your joystick in all directions to relieve pressure? It's a good habit, and time saver to do.

If there is pressure in the lines, one method of releasing that pressure is wrap a rag completely around the dis-connect that has the "ball" you can see a part of. Then, with your eyes protected, with your hands tightly holding the rag you just wrapped, push (slam, pound) the ball down onto a 2x4 or some other solid board.

When the ball is pushed in a bit, oil will come out, and the pressure is released. Be careful with hydraulic pressure, because it come out of the system with high energy!! Keep esp. your eyes protected.

 

[powersrp]

ok thx, i usually do, but that was last fall, i released the tractor side pressure, for the hose side ill have to stick sumthing in there to push that ball in. sounds like thats the problem, thx again


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[eserv]

Safer and more gentle to just loosen a fitting at each end of one of the cylinders for the offending coupling

 

[redfernclan]

Don't forget that if it has gotten warmer since you removed the implement, there will be a build up of pressure. That one has caught me before.

 

[baronetm]

Safer and more gentle to just loosen a fitting at each end of one of the cylinders for the offending coupling

I fully understand the why, but prefer a rag with a wood or brass dowel and a good rap with a hammer or press the quick connect fitting up against a solid object if possible to release the pressure, below is my reasoning and experience. I know it may be a bit long winded but in my experience just telling someone to do a process a certain way without your reasoning usually falls on deaf ears.

In my many years of working with industrial hydraulic systems most with pressures of 3000-4500 psi if any hydraulic component was removed from a system we required a new fitting or fittings, O-rings etc. to be installed. Yes it sounds expensive but, the danger of leaking oil and additional down time is much more costly. I have seen or should I say heard screaming hydraulic oil from a pinhole leak atomize into a mist, you could not tell where it was coming from. A piece of cardboard taped to a broom handle waved in front of where you suspect the leak is and have the cardboard cut like a knife went thru it, I have seen broom handles nearly cut off. I have also seen atomized hydraulic oil hit a very hot surfaces and explode into a fire resembling a blow torch, and yes it required a full blown facility evacuation, thankfully the machineries fire suppression system shut the equipment down and did an excellent job keeping the fire under control.

That being said, I have attached some educational material from Parker Hydraulics techconnect with their recommendation of the reassembly of hydraulic fittings, i.e. the more times you loosen a fitting the more likely it is to leak.

http://blog.parker.com/how-many-times-can-i-reassemble-a-hydraulic-fitting