Hyd problems

[David in TN]

On this 2630 that I just bought, the bucket cylinders leak down letting the bucket roll down...and it happens pretty quick, you pretty much have to keep the lever pulled to keep it rolled up. One of the lines was dripping so I replaced it, but it didn't help. So I guess it would be the spool valve or the cylinders??

Also, when you first start it up the loader is real jerky, but smooths out after you run it up and down a couple of times.

 

[Hayfarmer]

Jerky movement usually indicates air in the lines, or may be because fluid is leaking down when it stops. I would start by changing the hydraulic filter. Is your loader plumbed into tractor remotes or seprate valves? If using the tractor valves you might try hooking to another implement to see if it leaks down also, would narrow it down a bit. As I remember the remote valves on those tractors are quite touchy to adjust and adjustment is fine.

 

[wilamayb]

I think you hit the two things that can cause the problems. It's gotta be the cylinders or the valves so long as you dont have any external leaks.

A good way to check is to raise the loader and unplug the hoses from the back of the tractor if you are running the loader from your SCV's. If you have your loader plumbed into a joystick then you'll have to be a little more resourceful and buy some plugs or caps to plug your cylinders while the loader is raised. We use a chain fall for this, but you'll have to use a pole under the bucket or hold it up with another loader... etc.... while you cap your cylinders. After youve got your loader isolated from your tractor it should be easy to see which one is causing you the probs.

Those jerky lines upon startup are from, as the other gentleman said an inadequate delivery of hydraulic fluid to the main pump. This jerking is called cavitation which is just as the name suggests. There is a cavity in the line that is not filled with pressureized oil. This occurs everytime you see the line jump up and down. The line jumps everytime a piston in your pump makes a stroke which is about 8 times engine speed since there are 8 pistons in your pump.

This can be fixed by supplying enough oil to your main pump at startup. It may be a checkvalve?? If your system has an airleak anywhere on the supply side the oil will drain back to sump while the tractor sits turned off. Sometimes if this isnt too bad it can wait until you have the tractor split for some other reason to see the location of the leak.

The best of luck with that loader!

Glad to see another TN resident here. I'm a middle Tennessean from the big town of Centerville. Where is home for you?

 

[David in TN]

I've studied it a bit more and found that the loader will stay up even with the tractor turned off. But the bucket will not, it rotates downward as if you were dumping. And it will continue all of the way to where it's hanging straight down. The cyl rams are rust free and don't have any groves. The area around the bucket and clys is dry. The loader is plumbed to the underside of the trans, one line goes to a big round thing that I assume houses the filter (I'd guess that is the return line) and the other is right behind it and that line T's and one side goes to the loader and the other goes to the 3 pt. and then the rear remote comes off of that and has a lever for it beside the one for the three point hitch lift arms. The area behind what I assume is the filter housing is a bit wet and it seems to be coming from a plug behind the filter, nothing major, but I will fix it anyway. I'm guessing the cap under and behind the seat is for filling with hyd fluid and the plug below it and on the left side is a sight plug for the hyd reservoir?

Man, I wish my books would get here, I went to TSC to see if they had one of those IT manuals for it and they didn't have that one.

Thanks,
DD

 

[David in TN]

Well, howdy neighbor!! Centerville huh? I lived in McMinnville until I'z about 14 (1975) we use to go up to your neck of the woods for some fishing and to some restaraunt that had awesome catfish. I still have some kinfolk around those parts. I live in Bradley county now.

 

[wilamayb]

Sorry!!! I just noticed that it was your bucket cyls and not the boom cylinders. You can use the same process, except for it will be easier. Set your bucket flat on the ground, then cap the cylinders and raise the boom. What happened? If I had to bet I would look toward your external valve.

So you live down there near Chatanooga with the mountain folk? LOL

 

[johns48jdb]

my ford back hoe will whine (needs some chesse to go with it) when its low of fluid and will chatter and jump with either the back hoe or end loader being used. i think the fluid is leaking past the spool in your tractor. my back hoe leaks down real bad and the ford dealer want fix it because it"s to hard to get to. he says that there is a hair line crack in the area around one of the spools that lets fluid leak past. good luck.