Airsoft Action - January 2021

TECH TALK
UMAREX VFC MEETS JEFFTRON LEVIATHAN
a tech point of view, it makes splitting the gearbox
so much nicer and the possibility of a deadly spring
leaving the back of the box at MACH 3 is completely
removed from the equation! Trust me, it CAN happen
and it is THAT fast!
Now inside the gearbox, we were presented with
some high quality components; it’s just a shame there
was a problem with the Mosfet. They’re an electronic
component and these things happen. It was nice
to see that there was some quality anodised parts,
a lovely red anodised cylinder which was very solid,
vented piston head which was CNC ally, cylinder
head CNC anodised, double O-ring gave a good seal,
nozzle which had an O-ring and again is made from
CNC ally. The gears I was impressed with, as you
could easily see these were machined to a very high
standard and a nice little touch with the stamping;
they were shimmed very well from the factory which
added signal wire that is needed, these tabs are made
redundant purely to allow more space and prevent any
crimping of these new wires. The slot for the trigger
to sit in needs expanding by about 2 thousandths,
in order for the trigger to operate smoothly. The
main circuit board itself is held in by small screw and
shows time and effort has been put in rather than just
thrown together. We had to add 0.1mm shim to both
the sector gear and bevel gear, which is exactly the
same as what I had to do to another VFC gearbox the
day previously. The quality of the casing in which all
this lovliness was housed was just as high in quality;
no cheap material was used on its construction.
So out with every part and bag up parts we no
longer needed. The trigger (Jefftron supply a nice
flat anodised CNC trigger), the old curved one, is
no longer needed, along with all of the wiring, the
trigger shuttle and contact and the cut off lever all
went into a little bag forever to be forgotten. The
beauty of the Leviathan means you no longer require
these actual mechanical parts.
Before fitting the new Leviathan there were a
couple of minor (but crucial) alterations we had to
perform. There are a few little tabs that sit on the
left-hand casing that keep wires where they are
supposed to be once closed together but, due to the
orientation of the board is crucial so the contact
between the cam lobe of the sector gear and the
microswitch can be made fully, which acts as the cut
of lever, or COL (as some of you might refer to it).
Once this was established, it was then a case of
routing the wires and making them so as not to
interfere with the motor head (Jefftron recommend a
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