7
LF45/55 series
General
STEERING BOX
2-5
Hydraulic operation
The hydraulic part consists of a cylinder with
piston and a control valve (Q) which is
integrated into the input shaft/worm shaft. The
oil enters the steering box at the top. The oil
leaves the steering box at the bottom through
the control valve and the hollow worm. This
design keeps the steering box at a more even
temperature, even when there is no steering
action.
The core (Q) of the control valve and the input
shaft (P) form part of a single unit. The casing
(R) of the control valve and the worm shaft (K)
form part of a single unit.
The input shaft (P) is supported in the worm
shaft (K). The input shaft and the worm shaft
both have six recesses.
The recesses on the input shaft (P) are
connected alternately, with three to the delivery
pipe (C) and three to the return pipe (D.
The recesses in the worm (K) are connected
alternately, with three to the left-hand side and
three to the right-hand side of the piston.
In the neutral control valve position the recesses
of the input shaft (P) and the worm (K) are
positioned in relation to one another in such
away that the left-hand and the right-hand sides
of the piston are connected to both the delivery
pipe (C) and the return pipe (D).
The forces exerted on the left-hand and
right-hand side of the piston (H) are equal and
there is a hydraulic central position. The neutral
position of the control valve is factory set during
the manufacture of the steering box.
ᓻ 200322
3