Using loader and external hydraulics??

[Arkwright]

Oh dear, "Two nations divided by a common language!":laughing:

Over here, "tap" means what I think you call a faucet. Those are the two things with round knobs on the lines going to the FEL just in front of the cab. Turned one way, they allow the flow to the FEL. Turned 90 degrees, they shut off the flow and, in effect, isolate the FEL.

By T I mean as if in a T junction. Flow goes (as in the letter T) vertically up the stem, then turns 90 degrees either side to split the flow. So, the flow of hydraulic oil in my tractor goes from the hydraulic pump to the spools at the rear, then splits (at the T junction!) to go to the FEL and rear auxillaries (then via the couplings and hoses to the transporter).

Sorry for the confusion!

From the operator's manual, there are hydraulics to the rear lift arms. A small lever cuts off flow to the arms so they remain stationary and the extra flow is diverted to the auxillaries.

The quadrant lever is set to Transport.

I think that's about it, but everything is done according to the manual. Somehow there is insufficient pressure getting to the transporter. Hopefully, the dealer's mechanic is going to call today and he can test pressures and explain where the problem lies.

BTW, I did a search of this and another US forum for MF390 and virtually nothing came up. Maybe they weren't exportedto the USA? This is a medium range 90HP tractor with turbo and 12 gear shuttle, very popular over here especially amongst livestock farmers. I am having similar problems to getting a diagnosis on the British Farming Forum, the upside is I don't have to explain what a tap is!:laughing:

 

[dmay]

Over here, "tap" means what I think you call a faucet. Those are the two things with round knobs on the lines going to the FEL just in front of the cab. Turned one way, they allow the flow to the FEL. Turned 90 degrees, they shut off the flow and, in effect, isolate the FEL.

IIUC you should have 4 hydraulic lines going to the FEL (2 for loader up/down, 2 for bucket curl in/out). You state you have 2 taps. Dont you need 4 taps? One for each hydraulic line?

 

[Arkwright]

IIUC you should have 4 hydraulic lines going to the FEL (2 for loader up/down, 2 for bucket curl in/out). You state you have 2 taps. Dont you need 4 taps? One for each hydraulic line?

I have four faucets (!taps), as you state. But an interesting point. Some tell me I only need two, one on each of the supply pipes as when they are closed no fluid is going to return anyway.

 

[dmay]

When you disconnect your 4 loader lines does it work? If yes, I'd say this proves 4 taps are needed. If no difference it remains a mystery.

 

[KWentling]

So when you close the four taps to the FEL, the transporter does not work? I believe you said one function worked but not the other? Have you held the lever for that function long enough to purge all the air out of the cylinder? You could have a bad quick connect or one that is not fully seated. Have seen hoses fail inside and restrict flow to the point of barely working. I guess you understand that to operate this way with tees, to operate the FEL the transporter has to be disconnected, and to operate the transporter the taps have to be closed to the FEL?

Kim