Hydraulic Cap popping off

[mvwood]

I have a 2013 B26 TLB and I noticed the other day while I was checking things over that the cap to the hydraulic fill was missing. I found it laying on the backhoe floor board. So I snapped it back in and went on my way. Well now I have noticed that every time I use the tractor it pops the cap off.
I currently have a piece of wood wedged on top of it to keep it in place. Has anyone had an issue like this? is there some type of relief port or valve that could be blocked or stuck that is not letting the excess pressure out? I checked the fluid and the level is within spec. All implements seem to function properly although I have not tried the 3-pt hitch as of yet since the backhoe is currently in place.

 

[Bulldog]

It should have a vent and a lot of the time it's the fill cap but I'm not sure about your model. I'd find the vent before using it any more than I had to. Obviously it's building pressure which means by you holding the cap on you are risking blowing seals out. Find the vent asap.

 

[JerryMT]

It should have a vent and a lot of the time it's the fill cap but I'm not sure about your model. I'd find the vent before using it any more than I had to. Obviously it's building pressure which means by you holding the cap on you are risking blowing seals out. Find the vent asap.

+1. The hydraulic reservoir must have a vent and yours is plugged. Look for a hole in the cap. It may be plugged.

 

[North Idaho Wolfman]

Clear/clean/unplug the vent:

 

[mvwood]

Ok so I figured that piece was the vent since it sits right next to the cap. I pulled it off and there was no dirt or blockage. Drove the tractor after and still popped off the cap. One thing to note is the rubber cap doesn’t seem to have much grab when I push it in. Possibly it is just worn a bit and doesn’t have as much resistance as the breather tube and therefore the pressure is pushing it off? I will order a new one and report back.

 

[stumpcutter]

does cap have o ring? or place for one

 

[mvwood]

Actually there is no O ring or a place for one just 3 ridges in the stem. Possible not the correct cap?

 

[Roll]

Clear/clean/unplug the vent:

You can just pull this vent out of the valve assembly with a little twisting motion and out it comes. Mine was plugged solid with dirt and grease. Blew it out and popped it right back in.

Roll