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Tanco Autowrap 1300 EH
Operator’s manual
13.0 DESCRIPTION OF HYDRAULICS.
TANCO AUTOWRAP 1300 is driven from the hydraulic system of the tractor. The hydraulics of the
machine can easily be changed from "Open
Center" to "Closed Center" hydraulic
system.
13.1
"OPEN CENTER" HYDRAULIC.
Most tractors have an oil pump which gives a certain quantity per revolution. The must be set in
open canter position. If no other function is activated, the oil flows from the tractor, through the main
valve block and back to the tank. When one of the functions on the control unit is operated,
THE
MASTER VALVE
, closes the oil flow circuit, and simultaneously the valve for the current function is
opening.
"CLOSED CENTER" HYDRAULIC.
For tractors with a variable oil pump, like John Deere,(See fig 4-7).. The oil can only come into the
main valve block when one of the functions is operated.
The "closed center" valve, opens the oil flow into the block, and simultaneously the valve for the
current function is opening.
THE MASTER VALVE
, will always close, and the "closed center" valve, is automatically opening
regardless of which function that is operated.
13.2
THE CUTTER.
To prevent the oil pressure to the cutter from falling, so that it holds the film long enough, there is a
piloted non-return valve underneath the solenoid valve on the main block.
Inside the block, there is also a non-return valve that prevents the oil leaking back through the valve
however sudden pressure impulses in the return system can open the piloted non-return valve.
13.3
The hydraulic system is equipped with a safety valve, which is preset to 185 bar. It opens for the oil
circuit to tank if max. pressure is exceeded. This valve is attached to the main valve block.
Fig. 13-1
NUMERICAL ORDER OF THE
SOLENOID
VALVES
The numbers of the solenoid valves are identical with
the corresponding numbers on the electric leaders.
Valve for CUTTER
= Valve no. 1 - 2
Valve for ROLLERS IN / OUT
= Valve no. 3 - 4
Valve for wrapping arm, speed
= Valve no. 5
Valve for wrapping arm, full speed = Valve no. 6
Master valve
= Valve no. 7
