29
Tanco Autowrap 404 EH
Operators manual
13.0
OPEN / CLOSED CENTRE CONVERSION
The 404 EH hydraulic system can be set up for tractors with open or closed center
hydraulics
Open Centre Hydraulics
Most tractors have a hydraulic system that gives a continuous output which flows
through the valve on the machine and back to tank when no function is operating.
(Open center).
TANCO AUTOWRAP 404EH is set-up for open centre on leaving the factory.
Close Centre Hydraulics
Some tractors, (like some John Deere), have a hydraulic system that require the valve
on the machine to allow no flow when no function is operating (Closed center). The
hydraulic valve can easily be configured to operate in this way.
Simply push and twist the manual override on the master valve. (see fig 4.2)
Fig. 4.2
LS Hydraulics
Many modern tractors have a “Load Sensing” (LS) hydraulic system. This is most
efficient as the pump remains on standby, pumping no oil until it gets a signal from the
machine. It is possible to run this machine on a load sensing tractor with the standard
valve. Configure the valve for open centers and if possible adjust the flow from the
tractor to give ~30 l/min. This however means that that tractor is constantly pumping
and you do not get the benefit of the efficiency of your load-sensing pump.
Thus Tanco Autowrap strongly recommend that if you are running the machine on
tractor with LS hydraulics you should fit the optional load-sensing block (see hydraulic
circuit). With this block fitted a Load sensing signal is transmitted in the form of
hydraulic pressure via a hose for the LS port on the LS entry block to the LS connection
on the tractor.
Note that the LS entry block can be configured also to run on any other
hydraulic system, open or closed center.
