656 hydraulic leak

[AJTEETER]

I have a 656 with a leak around a pipe it?s a low pressure line with a T pipe that looks like it screws into the housing it looks difficult to unscrew as there?s a ton of stuff in the way and if I replace the seal how would you tighten it to line up with the hoses I thought it might be a compression fitting but can?t tell I have a couple of pictures but it?s hard to see also it?s under the transmission linkage thanks

 

[caterpillar guy]

Looks like you need to clean it up a bit first. Then you can find just where it is leaking. My first guess looking at it would be the hose and clamp.

 

[AJTEETER]

Thanks but I can see where the oil is coming from it appears to be leaking where the pipe goes into the housing so I?m wondering how to get the pipe out

 

[pete 23]

I was involved with a rather lengthy discussion about that fitting a while ago on one of these forums. From what I remember when working on them back in the day, that fitting is brazed onto the pipe and the fitting threads into the (housing) top cover of the TA. Only way to get it out is to unscrew it, BUT, there is a hose connected to it on the inside. That hose has a clamp on it and will not come through the hole.

So, what I would suggest is to clean it up good and apply some good sealer from the outside where it is leaking. It is only residual pressure of returning fluid. Maybe liquid steel or liquid solder. Those place are miserable to work on a 656 with all those lines. I used to talk the customers into removing any of those forward hydraulic lines to the quick couplers and really clean that mess up under there. They were actually intended for front mounted cultivators and some guys used them on loaders but I preferred to run hose from rear couplers instead.

 

[BarnyardEngineering]

Sometimes you just have to dig into it and get things out of the way in order to get to the part that's leaking. There isn't always a trick.

But before you pull anything apart, I second the notion to clean things up. Pressure washer and degreaser (e.g. Dawn dish soap). That will make it much easier to work on, AND prevents dirt and crap from getting into the hydraulic system causing more issues, even though you know where the leak is.

 

[AJTEETER]

Thanks I will clean it up, that's a lot of years of gunk and oil in there and maybe pull out those lines as Pete suggested, I don't use the front remotes anyway and then I can get in there and see where on the fitting the leak is. I will give the liquid steel a try but right now I can't get my hand in there to do anything. Thanks for your help