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You want the
adjustment set just far enough in that the gun will fire
reliably
across all six lobes, but not appreciably more than this. Check
the function of the single shot trigger at this point.
12. At this
point it is time to remove the back plate/Crankfire unit as an
assembly from the gun. Make sure that it can be removed and
replaced with out any interference between the back plate
trigger and the main trigger bar inside the gun. There is
plenty of clearance on my TNW gun here, even with the rocker arm
adjusted to put excess pre load on the back plate trigger.
However, on
my gun it appears that the radius, for the interface between the
main trigger bar and the back plate trigger, was probably
generated on a belt grinder by hand. So I have no idea how much
dimensional latitude may be present in other guns. I don't
think it will be a problem, but please pay close attention here
and let me know if you do have a problem.
13. Assuming
all is well at this point, test firing the gun is in order.
There are two
methods of operation for the "Deadman" crank handle. You can
engage the drive dogs by applying pressure against the
spring-loaded handle to the "IN" position and then rotate the
crank. Or you can leave the handle in the "OUT" position
(freewheeling) rotate it to the desired speed and then move it
over to the "IN" position to engage the drive pin on the shaft
and fire the gun in short bursts. The single shot trigger is
attached directly to the rocker arm weldment and will fire the
gun any time it is depressed. I have found the best position
for the crank handle, when using the single shot trigger, is to
let it lay towards the rear of the gun on top of my hand when
holding the spade handle. Also, I prefer using two fingers on
the single shot trigger, may just be me, but it seems to afford
better control than using just my index finger alone. I haven't
had the opportunity to try "bump firing" with the single shot
trigger, but I think it might work pretty well this way, if one
was inclined to do so.
14. If you
want to reverse the crank handle from one side to the other, the
procedure is as follows. Remove the dust cover. Looking at the
cam, you will see a 1/8" roll pin in the drive slots. Drive
this pin completely out. There is an E clip on the end of the
drive shaft next to the housing. Remove this clip. Withdraw
the shaft/crank assembly; the spring load on the rocker arm will
push the cam down a bit, so some pressure on the adjusting screw
end of the rocker arm is in order. Remove the cam and reverse
it so that the drive slots are on the same side you want the
handle on. While holding the cam against the spring loaded
rocker arm to align the holes, slip the shaft/crank assembly
back in. Replace the E clip and the drive pin.
15. Clean and
lubricate the Crankfire unit the same as your gun. Use a little
grease on the cam pins and the rocker roller. Just make sure
that everything in the unit can move as freely as possible, any
drag or binding will serve to decrease the unit's performance.
16. SAFETY CONSIDERATIONS: The
spring loaded "Deadman" crank provides only a small safety
feature in that the crank is automatically disengaged from the
cam when firing pressure is released. Please do not attempt to
defeat this feature. A fixed crank hanging off a LIVE GUN is a
matter of "when" not "if" it will get bumped! But, DO NOT rely
on this feature to put the gun in a SAFE condition, it DOESN'T!
The single shot trigger is always HOT, and will fire the gun if
it's loaded. The only SAFE condition for the Browning guns is
when the chamber is EMPTY; NO BELT in the gun and the top cover
is OPEN!
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