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4020 Hyrdaulic problem

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dave

08-16-2002 20:15:32




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My loader is unable to lift a 1700 lb bale more than a couple feet. Is this a hydraulic pump problem or should I be checking other things first? The pump does have a pretty bad leak. How much of a nightmare is it to remove the pump?
Thanks in advance




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Jim

08-18-2002 04:10:23




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 Re: 4020 Hyrdaulic problem in reply to dave, 08-16-2002 20:15:32  
You can check standby pressure by putting gauge in remote cyl. outlet. Tech. manual calls for 2250 psi but you can up it to 2400 psi without harming anything.That 150 psi will help loader work faster,stroke control screw setting is on bottom of pump.



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gy3020

08-17-2002 13:22:15




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 Re: 4020 Hyrdaulic problem in reply to dave, 08-16-2002 20:15:32  
Hi Dave,
Just a note here on pump removal. I had a fire on my 64 model 3020 back in 99. I had everthing off of the top side and I pulled my pump out from the top. The book will tell you too pull the front end out from under the tractor and take it out the bottom. Just for my 2 cents worth I would much rather get at it from the top side. It's really not that big a job pulling the fuel tank too get at it and I would much rather not mess with a tight front end. As for the lifting, I would do as the others suggested and check filters and try to stop the leaks if possible. Are you running it off of your remote hydraulics or did you add a valve? I bought a 4020 with a 48 loader on it about a month ago and its just been super. Batteries keep running down after awhile but I will convert it to a 12 volt starter and alternator this winter and do away with the 24 volt nightmare, many do not like hearing about this change over but I use these things to run a custom hay baling business and I need a good system that I can depend on. The 12 volt is so much easier to troubleshoot and deal with. Hey thats more than likely why they went to it, don't you think?
Hope this is of some help too you, holler back if want.
Gary

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Brokenwrench

08-17-2002 13:17:01




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 Re: 4020 Hyrdaulic problem in reply to dave, 08-16-2002 20:15:32  
Just a question, but do you have the clutch pushed in while trying to lift the bale? The clutch must be engaged to run the charge pump in the trans. in order to pump oil to the main hyd. pump up front.



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G-MAN

08-17-2002 06:22:02




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 Re: 4020 Hyrdaulic problem in reply to dave, 08-16-2002 20:15:32  
You might want to get a hold of a service manual and do a little more troubleshooting before you tear into the pump. What strikes me as odd is that your tractor will lift the bale a ways and then stop. It shouldn't require any more flow (pressure) to raise the bale 4 feet than 2. First make sure the system is full of fluid. Does the pump start chattering when it quits lifting? I would make sure the system is full and start with a flow test, because removing the pump is no fun, especially if it's not necessary.

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zane

08-17-2002 05:25:55




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 Re: 4020 Hyrdaulic problem in reply to dave, 08-16-2002 20:15:32  
The leak itself is no reason for it not to lift unless it is really bad. First, get under the front with a flashlight and look a the pump cylinder plugs visible from underneath. You can get at them to tighten or replace the O-rings underneath the plugs. Also look at the high pressure outlet fitting (45 degree ell)on the right side of the pump. Sometimes they will work loose and leak bad.

To tighten the ell, or to get at the cylinder plugs on top of the pump, you will have to get at it by taking something off. My preference is to go in from the top by removing radiator, fuel tank, and tank pan. That way you can do everything standing up. And you can get at the whole pump without necessarily removing it. If you need to run the engine to locate the leak or test your repair, you can rig up a fuel supply and run it for a few seconds.

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JD 4000

08-16-2002 20:42:52




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 Re: 4020 Hyrdaulic problem in reply to dave, 08-16-2002 20:15:32  
did you check the hydraulic filter under back of tractor axel? to remove the pump you will have to jack the front tractor up and take front wheel axel off that's way to remove the pump you will need to make a stand or put something under tractor so the front dont drop when remove the front axel.



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