MF 6480 slow to lift

[made2fail]

Mf 6480 teir 3 Perkins slow to lift linkage
Start the tractor & 1st lift of the linkage & the speed is ok, drop the linkage & thats ok.
2nd lift is very slow, can just see the arms moving.drop speed is fine.
Every lift now is slow.
Stop the tractor & again 1st lift is normal speed than 2nd is slow.
Use the hitch switch or the fender buttons & lift is normal.
Have swapped armrest,draft pins,linkage panel & position sensor,linkage computer from another tractor & still have same fault.

 

[Audi90]

Have you checked the hydraulic/linkage priority setting on the left hand screen?

 

[Audi90]

Or on Datatronic if you have that.

 

[bt12]

Probably poor earth on solenoid try bring wire off chassis to earth wire on solenoid plug and test out

 

[made2fail]

No hydraulic priority page on screen as I don’t have electric spools & no datatronic. Could possibly be poor earth but it’s so regular that it works ok on 1st attempt after starting tractor.

 

[Audi90]

My tier 2 6470 has the priority page and it only has mechanical spools. No Datatronic either.