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JD 3020 Hydrualics

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DHunter n NOLa

10-20-2002 04:49:34

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I have a FEL mounted on my 3020 that runs off of the remotes. Problem is that the hydraulic pump that feeds the main pump only works when the clutch in engaged. So when you are moving the bucket with the clutch disengaged you soon run out of fluid in the reservoir behind the fuel tank. There's really not much room up there to install a larger reservoir. I've considered installing a sepearte pump on the PTO but then any implement hooked to the PTO would have to be disengaged if I wanted to use just the FEL.

Is there any other way to do this except install a larger fluid reservoir or change tractors. I like the 3020 too much to do that.

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DHunter n NOLa

10-20-2002 15:41:58

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

Thanks guys for all the good feedback. Here's some more information on my 3020. It is synco-range transmisson. The serial number is 134676R. The system was recently drained because I had to change the load control shaft. It was refilled with fresh clean hydraulic fluid. At that time the filter was changed and the transmission reservoir screen was checked and found to be clean. I keep the hydraulic/transmission fluid level about one gallon overfull (Dealer recommendation). I had the main hydraulic pump rebuilt this past spring. Rarely, but sometimes, I do loose power steering until I re-engage the clutch. First thing that starts happening is that movement of the FEL gets jerky and the hoses vibrate like the pump is cavitating. That's about all I can think of right now.

First one with the right answer wins the prize!!

Regards
DHunter

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Rodney A. Johnson

10-21-2002 06:47:40

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Re: Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 15:41:58

twopop gave you the correct answer. I'm guessing deere went to a "feeder pump" with the 20 and 30 series to get a higher volume of hydraulic fluid flow. If you look at the hydraulic lines of a 10 series vs. a 20 series you'll notice a difference in hydraulic line diameter. Something like 3/8" vs. 1/2" for the remotes if I recall correctly. The 3010 had a 16 GPM pump while the 3020 had a 18 GPM pump. Typically the 20 series also ran a little higher pressures...around 2300 vs. 2200 for 10 series.

Anyone who has owned a 30 series tractor and lost brakes, steering, and remotes can tell you about the cost of fixing the feeder pump...I believe the tractor has to be split to get at it. Not one of Deere's best ideas from a servicability standpoint. Reason why I happen to know this is my uncle ran into this problem with his 4230 a few months ago.

My '64 4020D loses steering and brakes in less than 2 minutes...course it is a bit old.

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chris

10-20-2002 19:26:21

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Re: Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 15:41:58

DHunter, try using your 3020 with the 3pt arms in the down position for awhile to see if there are any differences, then lightly touch your brake valve to see if it is hotter than the pressure line from the pump thats under the brake valve. If the valve is hotter that can be one problem. Next remove the plug in the differential housing behind the remote on the right side (where you adjust your load control setting) and with a small flashlight look inside the housing or put a light at the fill/add hole. There should be only a small drip from above the plug hole with the 3pt up. If it is a stream or spray/mist in the housing from above or from the rockshaft cylinder cover you need repairs. This all needs to be done with the tractor running. I'm also thinking of a valve down by the filter but I think this is only on the late models. Will try back with answer at a later date.

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twopop

10-20-2002 15:49:04

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Re: Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 15:41:58

you could find a pto pump to mount on the belly shaft that would run your loader faster than the tractor hyd,s will.belly shaft is the pto shaft that comes out the front of the rear housing,under the flywheel housing.

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JD4000

10-20-2002 11:39:14

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

did you check if the hyb, filter needs change? it may be plug up not letting oil go around.

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twopop

10-20-2002 11:32:17

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

the main hydraulic pump is supplied by a trans pump which is under the rockshaft housing and just above and forward of the ring and pinion.that is if you have a synchro-transmission.when the clutch is depressed the trans pump stops turning and hyd.oil is supplied to the main pump from the oil cooler.if you keep the clutch depressed long enough,you will run out of oil to the main pump.there is a check valve located in the rear housing(on early models) and on the outside of the left side of the rear housing(on later models)if the check valve leaks it will lesson the time that you have hyd pressure after the clutch is depressed.john deere can supply a retro fit kit to put the check valve on the outside of your tractor,if it is an early model

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Dan S.

10-20-2002 11:32:01

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

when you push the clutch in you should have hydraulics for about 2 minutes... after that you can expect to not have hydraulics b/c the rear pump that feeds the front pump does not run when the clutch is pressed. If you lose hydraulics faster than that something is wrong.

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10-20-2002 11:29:47

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

I"m not sure it this applies to the 3020 tractors but some JD tractors require the return oil from the remotes to be routed back to a different place when using high-oil-flow things like your FEL. Normaly the oil was just returned back to the oil sump in the transmission, but then the transmission pump can not keep up with the front engine driven pump. But rerouting the oil return sent the return oil directly back to the front pump. You'll have to find out if this will apply to your 3020. Perhaps Cloony or a good technician at you JD dealer will know.

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Joe C

10-20-2002 18:19:37

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Re: Re: JD 3020 Hydrualics in reply to C, 10-20-2002 11:29:47

Best place to run the retun line to is the filter cover. I have a hydralic run wood splitter that i run with my 3020, and i bought a new filter cover that has a return coupler in it because the oil got really hot if i used both lines plugged into the remote.

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Joe C

10-20-2002 18:18:14

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Re: Re: JD 3020 Hydrualics in reply to C, 10-20-2002 11:29:47

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JD70Jim

10-20-2002 09:38:20

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

I think that you have a problem, possibly an internal leak in the system somewhere. I have checked MY owners manual ( I have a 1967 gas 3020 with SR ) and it states in the specifications "closed center, constant pressure" which does not discribe your situation. Neither my 4020 nor my 3020 do what you discribe and I can find NO mention anywhere of any kind of: transmission driven, non-live hydraulic system option for these tractors. You should still have hydraulics whether or not your clutch is engaged or not. It is my understanding that the power steering and the brakes also run off of the same hydraulic pump. If the hydraulics were supposed to stop working whenever you engage the clutch, then neither the brakes nor the power steering would function either. I have MANY times used clutch, brakes, steering AND raised the implement using a remote, all at the same time, with no problem. These tractors can and do develope internal leaks. Good luck

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chris

10-20-2002 07:52:02

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

DHUNTER, your tractor's reservoir is the transmission case, and on a 3020 you will have 8 gallons of capacity. The res. you are talking about is the oil cooler for the hyd/trans. oil. Did you happen to change the filters, or drain the rearend and check your suction screen. Thats always a good starting point. Do you happen to loose the steering when you loose the hydralics. Is this an early or late model(where are your hyd. levers, right side of seat or in front of steering wheel. You might have a "high pressure leak to sump" which means some component of your hyd. system is failing either out of adjustment or worn parts.chris

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HaySam

10-20-2002 06:57:28

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Re: JD 3020 Hydrualics in reply to DHunter n NOLa, 10-20-2002 04:49:34

I'm having the same trouble on a 4020&3020 did not do that when thay were younger, maybe we can get MR Clooney to help us.

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deere04

10-22-2002 11:53:19

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Re: Re: JD 3020 Hydrualics in reply to HaySam, 10-20-2002 06:57:28

if filter and suction screen have been checked then the next is to check flow out scv to see if it in spec. these tractors have a return circuit that sends return oil back to return side of main hyd pump. these tractors were used with alot of single acting cylinders and have a manual bypass valve to let cylinders retract at a faster rate due to return oil is injected back in front of transmission pump flow. most of these tractors have the valve backed off its seal letting some return oil return to sump. this is on left side on return valve manifold and needs to be checked . the transmission pump does supply main pump but you have to return return function oil back to inlet side of front pump.

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