Four-Position Section - Zetor 8621 Forterra turbo Operator's Manual

Selective control valves
sections are assembled on tractors
equipped with electro-hydraulic, each of
section is with four-position version.
HYDRAULIC SYSTEM
F 173
with three

FOUR-POSITION SECTION

1 Rear margin position
Pressure oil flows to quick-coupler
"4" or "6"
2 Middle position
neutral (blocked)
3 Front margin position
Pressure oil flows to quick-coupler
"3" or "5"
Lever returns
middle position.
Control lever can be moved forward
4
through position III to position IV by
increased force.
Floating position (free). Both quick-
couplers "3" and "4" or "5" and "6"
are connected with return line.
F 173a
At two-section SCV the floating position
is in a margin position of control lever
opposite to outer circuit of regulation
hydraulic.
The first (right) section of SCV is
equipped with hydraulic lock in pressure
positions.
A - At two-section SCV this is a section
automatically to
B - At three-section SCV this is a
118
controlling quick-couplers
4 .
section controlling quick-couplers 1
and 2 .
F 173b
3 and