118
HYDRAULIC SYSTEM
F 173 F 173a F 173b
Selective control valves with three
sections are assembled on tractors
equipped with
electro-hydraulic, each of
section is with four-position version.
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 automatically to
middle position.
4
Control lever can be moved forward
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.
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
controlling quick-couplers 3 and
4 .
B - At three-section SCV this is a
section controlling quick-couplers 1
and 2 .
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