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JD 3020 FEL problem

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DHunter

02-16-2002 06:34:47




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I installed a Bush Hog 2426QT front end loader on my JD 3020 last fall. It calls for a 2450psi system and an 11 gpm hydraulic pump. From the gitgo there has been a jerking problem when you get into the top of the stroke raising the bucket. From all appearance the pump is cavitating and getting air into the system. The hydraulic fluid is kept at the proper mark on the dipstick. Does this system require an external hydraulic fluid reservoir or should I fill the system with the cylinders extended and then allow it to be overfull when they are retracted. If I'm on the wrong track here, please set me straight.

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old bones

02-16-2002 20:12:01




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 Re: JD 3020 FEL problem in reply to DHunter, 02-16-2002 06:34:47  
don't know about the pump situation, but if you have two way hydraulic cylinders on this loader (power up and power down), the oil level shouldn't change much- when the loader is raised, oil is pumped into the bottom end of the cylinders and is forced out the top side, back to the hydraulic system. vice-versa when the loader is lowered- in the top and out the bottom. a lot of older loaders, horn and early stanhoist for instance, only had one way cylinders- power up, gravity down. these required a reservoir that held approximately what the cylinder (when fully extended) oil volume was. just my 2 cents.

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JDWRENCH

02-16-2002 19:12:16




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 Re: JD 3020 FEL problem in reply to DHunter, 02-16-2002 06:34:47  
D, That is probably the main thing to check, Like the "brokenwrench " says. You need to be sure that
the hydraulis valve on the loader is a closed circuit type to match the closed circuit on the tractor .



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chris

02-16-2002 18:26:02




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 Re: JD 3020 FEL problem in reply to DHunter, 02-16-2002 06:34:47  
Have you drained your rearend lately and checked the suction screen, could be plugged with brake material or other foreign junk, this is the first place to start, since your running out of oil. chris



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luckydog

02-16-2002 13:03:04




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 Re: JD 3020 FEL problem in reply to DHunter, 02-16-2002 06:34:47  
DHunter-Have your hydro to the full mark then add 1 more gal of hydro fluid. I have done this for years and never had a problem. By the way, people at the John Deere store told me to do this little trick!! Works for me. luckydog



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Brokenwrench

02-16-2002 11:44:41




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 Re: JD 3020 FEL problem in reply to DHunter, 02-16-2002 06:34:47  
You are evidently starving the main hyd. pump for oil. The 20 series tractors use a charge pump in the trans. to push oil to the front pump. The clutch must be engaged for the charge pump to operate. You can install a reserve reservoir above the hyd. pump and this should aleviate the problem. Deere installed these on some tractors if they were spec'd for loader work, try a salvage yard and they should have the needed pieces.I've installed these on numerous tractors including some 30 series tractors with the same symptoms as yours. Also if yours is a console model you can install a power beyond block between the remote and rockshaft housing, this gives a better hydraulic flow to the loader valve than plugging into the remotes. One other thing to check is if a valve was supplied with the loader is it a closed center valve?

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