McHale Fusion 3 Baler & Wrapper
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the feed line. The tractor will have a fixed displacement pump and the output
flow is usually not adjustable.
3. Load-Sensing with “Power Beyond” fitted: This is, by far, the preferred
system. Most newer tractors are done this way, but not all. In this system, no
oil flows through the control valve, when the machine is idle, but it maintains a
low oil pressure in the feed line, (approx. 21 bar). The tractor will have a
variable displacement pump and will always have some means of adjusting the
oil flow on each auxiliary valve.
In it’s most ideal configuration, the tractor will have a “Power Beyond” connection, i.e.
oil comes direct from the pump, by-passing the tractor auxiliary valves, to a “Female ¾”
Quick Release’ connection, which becomes the Fusion 3 feed.
It will also have a 3
rd
connection to the tractor, called the pilot sensing line, and this pipe
sets the correct oil flow for the tractor to pump for each operation.
This is the most advanced and efficient hydraulic system available, as the Fusion 3
control valve now controls the amount & pressure of oil required for each control valve
operation, and only the correct amount is pumped. This will save up to 20 kw PTO
power on the tractor.
Although it is possible to operate the Fusion 3 with a load-sensing system via the
tractor auxiliary spools, i.e. continuous oil flow (control valve is set to open centre set-
up and flow is set to 45 litres/min from the tractor). McHale do not recommend
operating the Fusion 3 in this set-up, as controlling the oil flow is too variable from one
tractor to another, and there is also a 20 kw PTO power loss with it’s associated over-
heating of the oil.
Once the correct tractor system is identified, use the map in the next section, to select
the best set-up for the Fusion 3.
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