3020 john deere

[roottonic]

good morning, have 3020 j.d. with148 loader . loader has always worked fine until this morning. while useing it this morn. set bucket down , then would not lift or tilt. hyd. lines are limp . fluid full. any ideas where to start trouble shooting would be greatly appreciated. thanks in advance. mike

 

[Tx Jim]

How is loader controlled(scv or ind hyd valve)? Have you tried disconnecting/reconnecting any hyd quick couplers associated with FEL? Does power steering work properly?

 

[brin]

root - go to the back of your tractor on the right side now look around below ...not under, but below the seat on the hydraulic lines an you will see a flap switch...flip it the other way...somehow you may have hit that switch with debris or something...that has happened to be a couple of times...I don't have a diagram to post but look back there and see....good chance that is it..

 

[Tx Jim]

root - go to the back of your tractor on the right side now look around below ...not under, but below the seat on the hydraulic lines an you will see a flap switch...flip it the other way...som

No flap switch for hyd's on any 3020's I ever sold or worked on.

 

[brin]

No flap switch for hyd's on any 3020's I ever sold or worked on.

I have one on mine....I wonder why...? Maybe the previous owner had it there to switch from one connection to the other or some other reason...the switch is a flat toggle type switch and can be flipped up or down...I have not had to mess with it in a few years now...the tractor is out at the farm or I'd send a pic., if it would even show up where it is located.

 

[Harry in Ky]

I just looked at a 3020 this morning that suddenly lost all hydraulics. Front pump is turning, but there is no flow from charge pump. Oil is clean, suction screen is clean, but no oil from the charge pump. Any thoughts on that?

 

[Tx Jim]

Are you positive frt hyd pump shaft is spinning with the engine?? Gear may have broken it the trans pump.

 

[Harry in Ky]

Is that a common problem with earlier models? The parts book only shows a gear pump in the early serial number tractors. Later units show a gerotor type pump, and evidently, a different type setup entirely. I have a manual coming, but still a few days away. Can't get much detail from the parts book, but guessing the pump is at the front of the transmission and accessed by split between clutch housing and trans?

 

[Tx Jim]

Syncro-range trans has a gear pump mounted in the diff housing area driven off the top shaft in the trans. No it's not common for the trans pump gears to break but with the hyd's stopping abruptly it's all I could think of except the frt pump drive coupler failure. Trans pump can be accessed by removing rockshaft housing without splitting tractor. I recommend more hyd diagnostics before R&R of trans pump.

 

[Harry in Ky]

The tractor will still move, so at least most of the gears and shafts are still turning. If the trans pump has no output, what's left to diagnose? The pump is either not turning, or not functioning. Could be a break in suction or pressure tubing, but that's all internal. What else can I check without opening it up?

 

[Tx Jim]

Remove hyd filer,start tractor and see if any oil comes out. Trans pump should pump around 5GPM

 

[buickanddeere]

Still sounds like a stripped front coupler or shaft.
Does the power steering work?

 

[Draagyn]

Roottonic never got back with what problem was?
I have same setup that had been doing the same thing only intermittently.
Just recently started to loose steering along with loader hydraulics.
The idle will smooth out when this happens.
Then idle will roughen up again and hydraulics will be back.
Fluid full, gauge reads good.
Will get into the manual and get into cold see what I can find.

Cheers

 

[Tx Jim]

Draagyn
How long since hyd filter was changed & sump screen checked/cleaned? What controls FEL the scv's or an ind hyd valve? Have you ever checked stand-by pressure? It should be 2250-2350 psi.

 

[Draagyn]

I have not checked filter since I bought tractor about 30 hours ago.
I will try a new just so that I at least know when it's been done.
My manual doesn't say much about it. From what I can tell filter is on return line so I will loose very little fluid when changing?
From what I've read about sump screen on here is that it's a big job? Can't find info in manual.
FEL is on individual valves.
I will gather parts for stand by pressure test when getting filter.
Still waiting for warmer weather to wrench.
Thanks again Jim!

 

[Draagyn]

Would you know what size fitting I need on pressure gauge to hook up to Pressure control valve?

 

[Tx Jim]

Easiest way to check stand-by pressure if tractor has rear remotes is to just plug gauge into rear breakaway coupler and activate SCV control lever. Yes hyd filter can be changed without loosing much oil. Filter is one of the cheaper parts JD dealer sells. AR75603 Filter Element ADD 7.96 USD
Checking sump screen requires an oil drain or a running shop vacuum hose inserted in hyd oil filler tube. Sump screen is located between hyd filter & rear axle housing on LH side.

Is loader valve teed into hyd system or plugged into rear remote? Does your tractor have Syncro-range or Powershift trans??

 

[Draagyn]

FEL is T'eed in. Synchro transmission

 

[Tx Jim]

Remove FEL valve return line and aim hose in hyd filler tube now with both FEL levers in neutral start engine if oil flows out return line FEL valve is at fault.

 

[Draagyn]

I haven't had time to run any tests but I did get around to changing the hyd filter last night. Only got about half hour test in but it's worked flawless so far. Thanks again for the help Texas Jim!