JD 260 Hydraulic Issues

[littlegif1]

I have a 2001 JD 260 that I purchased last yr and when I run the skidsteer working the boom up and down frequently the boom cylinders heat up pretty good and I get to a point where it won't lift the boom anymore. I am not exactly sure where to start and I don't have alot of money to take it to a dealer so I was wondering if there are some things that I can check. Also, I was wondering how you replace ALL of the hydraulic fluid in the system? Draining the tank is fairly easy but how do you get all of the other hydraulic fluid out. When you put new fluid in how do you make sure you have all of the air out of the lines? How do you relieve the pressure so it is safe? Do you use the locking pins for the boom? Any help would be greatly appreciated. Justin

 

[Tazza]

There is no way short of removing all the cylinders, tube lines, motors and pumps to get ALL the oil out. The best you can do is drain the tank, re-fill and replace the filters then run the machine, lift tilt, drive etc. Shut down, then drain and re-fill the system.
If the cylinders are heating up that fast, I'd suspect your oil cooler or your pump is caveatting causing the oil to get too hot.

 

[Tazza]

Silly double post! sorry

 

[littlegif1]

Silly double post! sorry

Is there an easy or good way to check the oil cooler or pump to make sure that it is functioning correctly? Could it possibly be the control valve? Thanks for the help

 

[Tazza]

Is there an easy or good way to check the oil cooler or pump to make sure that it is functioning correctly? Could it possibly be the control valve? Thanks for the help

You would need to look at the cooler fins to see if they are clogged up.
I'd doubt the control block was a problem though.

 

[littlegif1]

You would need to look at the cooler fins to see if they are clogged up.
I'd doubt the control block was a problem though.

The pump and the oil cooler from deere is pretty expensive, is there a way that I can verify that is my problem? Do you have another source where you can get parts other than deere or is that pretty much my only option. I have been doing some searching online but haven't really found anything. Thanks

 

[Tazza]

The pump and the oil cooler from deere is pretty expensive, is there a way that I can verify that is my problem? Do you have another source where you can get parts other than deere or is that pretty much my only option. I have been doing some searching online but haven't really found anything. Thanks

If the cooler fins aren't all clogged with grass/oil it should be ok. Pumps should be able to be bought else where. There could be other things causing heat though.
Do you have any oil leaks?
Don't just throw parts at it, they are too expensive to just guess.

 

[littlegif1]

If the cooler fins aren't all clogged with grass/oil it should be ok. Pumps should be able to be bought else where. There could be other things causing heat though.
Do you have any oil leaks?
Don't just throw parts at it, they are too expensive to just guess.

The fins on the cooler look like they are clean and it doesn't seem to be leaking anywhere. The reservoir is full. When I have the problem the boom begins to have a difficult time moving upwards and eventually it won't lift at all and the pedals freeze up. I am usually able to let it sit for a few hours or something and everything works again, at least for about an hour or so. I appreciate you taking the time to respond and any additional assistance you can give me to help isolate the problem I would appreciate it. This is my first skidsteer and I use it around my yard so I am trying to save as much on repairs and stuff as I can. Thanks

 

[Tazza]

The fins on the cooler look like they are clean and it doesn't seem to be leaking anywhere. The reservoir is full. When I have the problem the boom begins to have a difficult time moving upwards and eventually it won't lift at all and the pedals freeze up. I am usually able to let it sit for a few hours or something and everything works again, at least for about an hour or so. I appreciate you taking the time to respond and any additional assistance you can give me to help isolate the problem I would appreciate it. This is my first skidsteer and I use it around my yard so I am trying to save as much on repairs and stuff as I can. Thanks

The pedals freeze up? san you explain this a bit more? it sounds like you have a restriction somewhere that is causing the oil to heat up. The controls should still be free to move though and not freeze up, unless its a newer electronic machine. I know my 753G has pedal lockouts that are controled by the computer, yours may be the same? If thats the case, it could be a safety device engaging to prevent damage to the hydraulic system.
Ok the things that can cause hydraulic oil to heat:
Blocked oil cooler fins or a bad cooling fan. This is usually used for the engines radiator too, so the engine temp should rise if this was a problem.
Pump cavitation due to air in the system or blocked pickup screen filter.
Aux hydraulics stuck on causing the oil to run over the relief valve. Normally when this happens, you will have a lack of lift and tilt power.
Those are the fet things i can think of off the top of my head. I don't think a bad pump would cause this, if the pump was bad it would simply not pump as much oil but won't over heat the entire system. Your lift and tilt would be very slow and lack power all the time as well.

 

[littlegif1]

The pedals freeze up? san you explain this a bit more? it sounds like you have a restriction somewhere that is causing the oil to heat up. The controls should still be free to move though and not freeze up, unless its a newer electronic machine. I know my 753G has pedal lockouts that are controled by the computer, yours may be the same? If thats the case, it could be a safety device engaging to prevent damage to the hydraulic system.
Ok the things that can cause hydraulic oil to heat:
Blocked oil cooler fins or a bad cooling fan. This is usually used for the engines radiator too, so the engine temp should rise if this was a problem.
Pump cavitation due to air in the system or blocked pickup screen filter.
Aux hydraulics stuck on causing the oil to run over the relief valve. Normally when this happens, you will have a lack of lift and tilt power.
Those are the fet things i can think of off the top of my head. I don't think a bad pump would cause this, if the pump was bad it would simply not pump as much oil but won't over heat the entire system. Your lift and tilt would be very slow and lack power all the time as well.

When I run the skidsteer for awhile working and the boom arms and bucket begin to have a more difficult time lifting eventually it gets to a pt where the pedals freeze up so no matter if you are trying to move the bucket or the boom arms the pedals wont move. They are locked in place. The drive on the skidsteer remains to work fine. Engine doesn't overheat or anything. There is one fan that is over the radiator and the hydraulic oil cooler is mounted outside of that. The skidsteer is a 2001 so I am not sure if it has an electronic shutoff or anything like that. When you talk about pump cavitation, is there a way to purge the air out of the system, if so how? or where can I find that info. When you said pickup screen filter is that something in the hydraulic reservior tank(sorry for my ignorance)? Aux. Hyrd. on, how much of a lack of power would I see? I did notice that I was kind of limited on the load that I could lift and I kind of figured I would be able to lift more than what I am because it doesn't seem like 2200lbs. I have a 6' bucked and I can fill it about half to 3/4 full of stone and that is about it. I know my aux hydrs work but how can I tell or check if there is an issue with the relief valve. The relief valve is in the valve control assembly right?

 

[Tazza]

When I run the skidsteer for awhile working and the boom arms and bucket begin to have a more difficult time lifting eventually it gets to a pt where the pedals freeze up so no matter if you are trying to move the bucket or the boom arms the pedals wont move. They are locked in place. The drive on the skidsteer remains to work fine. Engine doesn't overheat or anything. There is one fan that is over the radiator and the hydraulic oil cooler is mounted outside of that. The skidsteer is a 2001 so I am not sure if it has an electronic shutoff or anything like that. When you talk about pump cavitation, is there a way to purge the air out of the system, if so how? or where can I find that info. When you said pickup screen filter is that something in the hydraulic reservior tank(sorry for my ignorance)? Aux. Hyrd. on, how much of a lack of power would I see? I did notice that I was kind of limited on the load that I could lift and I kind of figured I would be able to lift more than what I am because it doesn't seem like 2200lbs. I have a 6' bucked and I can fill it about half to 3/4 full of stone and that is about it. I know my aux hydrs work but how can I tell or check if there is an issue with the relief valve. The relief valve is in the valve control assembly right?

Air will self belld over time, so you don't need to worry about purging it.
Pk, the pedals not moving means you do have some sort of safety lockout, i'm just not sure what, deere is new to me, they are all essentially the same in operation though.
The pickup screen could be anywhere, i know the old bobcats had one hidden in the port block. You could call your dealer and talk to the service dept. see if they can tell you if there is one. When plugged the drive is usually the one to suffer, and not the lift/tilt functions.
That lifting ability is about rite, stone is rather heavy plus the weight of the bucket.
Without an attachment on the hydraulics you would need to crack the couplers to see if when its running if its spraying oil out. Its normal to get a small amount of flow at very low pressure but not a spray.
The relief is on the control block.