john deere 2020 hydraulic trouble

[hernando]

had the loader off my jd 2020 for about a year ..it is a number 47 ...hooked it up to day and nothing worked .....loader cylinders didn't move at all....I had not got the brackets in place when all at once the lift cylinders extended.... after that nothing else moved at all I moved the valves back and forth and nothing..... any ideas what to check ??? thanks for any help you can give me ...bruce

 

[Tx Jim]

What type valve controls the loader(scv or ind spool valve)? If hyd quick couplers are involved are they seated properly?

 

[hernando]

I think it is a ind spool valve.... and they were seated well...thanks for the reply...bruce

 

[Tx Jim]

Does in spool valve have hyd quick disconnects? If so are the QD's seated properly?

 

[hernando]

it does have quick disconnects,,,,checked it again today...they were hooked up good and tight...could it be trash in the valve ?? thanks bruce

 

[J_J]

Recheck all your hoses for correct hookup.

Does anything else work?

Do you have about 2250 psi for pressure?

 

[hernando]

everything else works,,,i haven't checked the pressure yet.. thanks jj....bruce

 

[J_J]

When you move the lever for the loader valve, do both spool shaft push in and out equally.

I believe your tractor is a closed center hyd tractor, and should have some pressure at the in port of all valves.

If the valve levers are pushing and pulling equally, fluid should be flowing to the cyl, and if not, make sure the QD's are connected tight.

It does not take much pressure to move a cyl. Maybe look at the load check valves.

Once again, make sure the pump pressure hose is connected to the valve IN port and the tank port is going to the reservoir, and that the cyl hoses are going to the same valve spool.

 

[Tx Jim]

Yes a 2020 is closed center hyd's. Are you 100% positive you have the in & out ports on the spool valve attached correctly as J_J stated??????????

 

[hernando]

ok ..... ready for my beating.....I was sure I had them hooked up right....I even double checked it ....but yall are right I had them backwords,,,,I sure am getting old ,,,,and not much smarter....thanks for the help ...bruce