Valtra 6000 Workshop Manual page 1282

90. Hydraulic system
Figure 9. Control valve in neutral position
Function (neutral position)
When the tractor is started oil flows from the pump (port "P")
to the left end of the spool (1) through a drilling in the middle.
The spool is then pushed to the right against a spring and
opens the unloading circuit between ports P and N (pump ---
tank)
Through the drilling in the spool (1) oil flows through the dril-
ling at the right end of the slide. The constant oil (Qs) flows
via the main spool (2) to the tank ("port T").
Model
8. 11. 1990
1. 8. 1998
The main spool (2) is held in the middle position by the action
of the centring springs (left end of spool in fig 9) The pressure
(+spring) keeps the lowering valve (6) closed.
1) 3---way oil flow regulating slide
2) Main spool
3) Pilot pressure limiting valve for lowering valve
4) Shock valve
5) Lowering valve pilot piston.
6) Lowering valve
7) Free circulation oil to the transmission lubricating system
1225
Code Page
6000-- 8750 910 15