Valtra 6000 Workshop Manual page 989

61. Steering system
Steering system, description
Pressurized oil to the steering system (and to the working hy-
draulics) is supplied by the high ---pressure pump. The system
has a priority valve, which ensures that there is always enough
hydraulic oil for steering.
Pressure ---limiting valve (14 MPa) and shock valves (19,5
MPa) are fitted in the steering cylinder.
The steering valve on the 6100---8100 tractors is a load sens-
ing type of valve. Compared with the conventional unit, the LS
steering valve has a 5th additional LS port. One port on the
steering valve is for pressure oil feed, one for return oil, two to/
from the steering cylinder and one for the load sensing. The
load sensing pipe is fitted between the priority valve and the
steering valve.
5
6
9
10
Figure 1. Steering system
1. Suction pipe (in gearbox housing)
2. Suction strainer
3. Twin pump (oil supply to steering system from high ---pressure pump
(foremost)
5. Pressure ---test point (beside pressure filter)
6. Pressure filter (under cab floor on RH side)
7. Priority valve
8. Non ---return valve
9. Steering valve
10. Steering cylinder
11. Servo valve block, ---660070 (low ---pressure circuit)
8. 11. 1990
15. 5. 1993
8
7
LS
The LS port is either open to the return line when the steering
is in neutral, or open to the pressure feed line as soon as the
steering wheel is turned.
Important! With effect from tractor serial number 660071,
6100---8400 tractors have a new servo valve block. In picture
above is shown an earlier valve block. There is not an oil hose
between the new valve block and the priority valve
932
Model Code
6000-- 8750 610
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