INSTRUCTIONS FOR USE
AGT 850 / 860
53
4.5.5
DESCRIPTION OF CONTROL ELEMENTS FOR HYDRAULICS
Control element is a steering unit with control levers, with which we direct oil flow from tractor's
pressure circuit to hydraulic outputs of internal or external hydraulic users.
Tractors are, as standard, equipped with control element with three control levers. If the tractor has, as
option, an added front hydraulic lift mechanism, control element with four control levers is installed.
Each lever performs certain function through control valve.
A –
Control lever A
B –
Control lever B
C –
Control lever C
D –
Safety valve
E –
6/3-directional control valve
F –
5/3-directional control valve
CONTROL VALVES
Control valves control oil flow from pressure line to a certain implement. There are three types of control
valves: ONE-WAY, TWO-WAY or ONE-/TWO-WAY.
One-way functioning 5/3-directional control valve
One-way functioning control valve is connected only to one hydraulic conductor per implement, where
the conductor is for pressure and return line (when the valve lever is in position 2 "reverse").
Control lever has three position:
Position "1" – supply of oil under pressure (lift), control lever returns to neutral position
automatically
Position "0" – neutral position
Position "2" – oil discharge (float position), control lever is stuck – manual shift into neutral
position required
Stop device (DETENT)
Mechanically shuts active control valve, if you push the control lever to the end in certain direction.
Valve can return (release in neutral position) only manually with control lever. If the valve is not fitted
with a stop device, it always returns to NEUTRAL position, when the operator releases the control lever.
Two-way functioning 6/3-directional control valve
Two-way functioning control valve is for control of implements with two-way functioning hydraulic
cylinder.
E
F
D
C
B
A
DETENT
