2020 hydrolic problem

Tmills · Jul 2, 2017

Have a jd 2020 serial number#009357c had a leaking front hydrolic pump.took it apart replaced gaskets and o rings.put back in and it raised loader bout three times then quit working.have changed the filter and sump screen,and the screen filter in the pump.dont know where I should check next

Tx Jim · Jul 2, 2017

Welcome to YT
Did check stand-by pressure after R&R of pump? Stand-by pressure should be 2250 psi. What type valve(scv or ind) controls loader? With engine running at operating temp,3 pt raised look in hyd filler hole behind seat for misting oil which if misting is present indicates leaking control valve seals.

Tmills · Jul 2, 2017

[No misting,i will check stand by pressure in the morn.not sure in the controls it has two levers on upper right for the front end loader.ind?Tx Jim"](reply to post at 09:39:07 07/02/17) [/quote]

bteny10 · Jul 2, 2017

Tx Jim I'm stll looking for a surflex disk tiller the newer style with the 24 inch disks If you see
one call 402 740 4759 thanks

Tx Jim · Jul 3, 2017

[/quote]

With hyd oil at operating temp remove loader control valve return hose from tractor,plug orifice on tractor,start engine & ""no oil should exit open return hose"" with both levers in neutral.

Tx Jim · Jul 3, 2017

(quoted from post at 22:55:07 07/02/17) Tx Jim I'm stll looking for a surflex disk tiller the newer style with the 24 inch disks If you see
one call 402 740 4759 thanks

I haven't seen a model 2400 surflex in yrs but I'll keep on the look out for one.

Tmills · Jul 3, 2017

(quoted from post at 03:11:20 07/03/17)

With hyd oil at operating temp remove loader control valve return hose from tractor,plug orifice on tractor,start engine & ""no oil should exit open return hose"" with both levers in neutral.[/quote].I did pull the loader control valve return hose off and did as you said and oil did come out with bolth levers in neutral.

Tx Jim · Jul 3, 2017

If loader valve is the convertible type open center to closed center or vice versa then a seal on closed center plug could be leaking. Remove closed center plug(key 12A) & check seal(key 10) for damage. If seal (key 10) isn't leaking then spools & housing are worn out & need replacing with another complete valve.

Tx Jim · Jul 3, 2017

I just had another thought if FEL valve has a relief valve it might not be set above hyd system pressure(2250 psi) and it's bypassing.

Tmills · Jul 4, 2017

(quoted from post at 16:37:33 07/03/17)
I just had another thought if FEL valve has a relief valve it might not be set above hyd system pressure(2250 psi) and it's bypassing.

I will check that in morning thanks for the advice.just a quick question, everything worked fine before R&r of pump it was just leaking before.so that's why I thought I must of messed somthing up.is there somthing I could of messed up by reassembling it that would of caused this?

Tx Jim · Jul 5, 2017

Low hyd stand-by pressure could be the problem as stroke control valve valve which controls pressure could be faulty or not set correctly. As I previously stated stand-by should be 2250 psi.

2020 hydrolic problem

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