Kubota B8200 loader problem

[tomg]

Hi, I've got my Brother in Laws Kubota to look at, it's got a loader on it and the loader is very slow to lift, he took the loader off when he got it so don't know if it's always been a problem.
Power steering and rear linkage all work fine so I think I the hydraulic pump is ok. Oil level is fine. I've changed all the connections to rule out a dodgy fitting.
The loader works with power beyond so 3 lines to the spool block. Does anyone have any other suggestions?

Many thanks

 

[Dave W]

When you say power beyond do you mean the loader is plugged into the spool at the back?
It’s most likely a factory fitted thing and should have its own Dedicated supply.
If it has 3 pipes to the loader block then it’s most likely load sensing system

 

[tomg]

When you say power beyond do you mean the loader is plugged into the spool at the back?
It’s most likely a factory fitted thing and should have its own Dedicated supply.
If it has 3 pipes to the loader block then it’s most likely load sensing system

No the pipe work is from a block (load sensing?) from the centre of the tractor. What the green arrow is pointing to in the picture.

 

[Lazy Sod]

There are 3 lines to the spool block of the MX loader that I have on my Kubota. I asked MX why and they said that, having gone to the spool block, the pressure line then returns to supply the rear linklage etc. The 3rd line is obviosly the low pressure return.

 

[MF-ANDY]

When you say power beyond do you mean the loader is plugged into the spool at the back?
It’s most likely a factory fitted thing and should have its own Dedicated supply.
If it has 3 pipes to the loader block then it’s most likely load sensing system

No Load sensing on a 90s kubota.
Genuine loader will be fed from fed from a block in the steel pipe from the pump to the rear hydraulics then after it has passed through the loader valve it returns to the block and continues to the linkage or rear spools if there are any.
The 3rd hose is low pressure returns. There is probably a relief valve in the loader spool. A gauge on a ram pipe would be the first thing to do.