Aux Hydraulic Release Problems

[Miker67]

So, my machine was on a demo job and the guys snagged the line between the grapple and the boom and it broke the lower quick coupler where the lines meet the boom and the matching couple on the hose.
The bobcat dealer gave our field mechanic a new cartridge for the machine side of the coupler and a fancy new 90 degree coupler for the grapple side of things.
It looks wonderful, but the bottom couple that broke won't realease without a lot of effort unless you crack the fitting on one of the hoses to bleed it down manually. I can get it off wit a pair of channel locks, but can't reconnect it unless I crack the line.
This didn't do it before the fittings were replaced and the upper works fine.
Any thoughts? Maybe its just a stiff new fitting? A check valve?

 

[Tazza]

Is this the style that you push in to release the pressure? even new, the fitting shouldn't stick. It won't wear in... If the line was tugged on i can see a possible problem, but it was just a pinched hose. Have you spoken to the dealer about it? i guess it could have been a bad batch of couplers, who knows.

 

[Kermode]

Is this the style that you push in to release the pressure? even new, the fitting shouldn't stick. It won't wear in... If the line was tugged on i can see a possible problem, but it was just a pinched hose. Have you spoken to the dealer about it? i guess it could have been a bad batch of couplers, who knows.

I've broke more than my share of bottom couplers on my S185 and I've never had any problem. Just screw the new one back in and away you go. You've either got more damage than you are aware of or you've been sold a bad coupler. I can't see how one could have been installed wrong.

 

[Miker67]

I've broke more than my share of bottom couplers on my S185 and I've never had any problem. Just screw the new one back in and away you go. You've either got more damage than you are aware of or you've been sold a bad coupler. I can't see how one could have been installed wrong.

Tazza, it wasn't a pinch, it was a stiff yank. Snapped the collar of the machine side and broke the JIC fitting off the hose side.
Kermode, you have broken the machine side before?
Any chance that when they put the attachement side couples back on, they were reversed? I could see if there was a check in the system on the wrong side it could cause an issue. I don't think there is a check on a grapple though since it is just a double acting cylinder.
I have been dodging raindrops all weekend, but when it stops im going to pull the machine side cartridge and compare it to a parts unit I have.

 

[Kermode]

Tazza, it wasn't a pinch, it was a stiff yank. Snapped the collar of the machine side and broke the JIC fitting off the hose side.
Kermode, you have broken the machine side before?
Any chance that when they put the attachement side couples back on, they were reversed? I could see if there was a check in the system on the wrong side it could cause an issue. I don't think there is a check on a grapple though since it is just a double acting cylinder.
I have been dodging raindrops all weekend, but when it stops im going to pull the machine side cartridge and compare it to a parts unit I have.

I am pretty sure the connectors on the machine side are interchangeable. I swapped them around once in one of my more lunatic flights of fancy. Everything still worked fine. There is simply a relief port in the block that the connectors screw into. When you push in the coupler it opens the relief port into the case drain and dumps the pressure. Have you tried it with the pressure relief switch in the cab? That dumps all the pressure.