Figured it was simple. But you explained it very well!
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The typical 2 axle trailer shown here weighs around 6000 lbs. which is within the range of what a large log might weigh. When you heel them, of course, the leverage is against the loader, but it keeps
the log from swinging out of control. with shorter/smaller logs as shown in New Zealand the heel rack is unneeded as the rotate function on the grapple is sufficinet to control the log and when you
are making multiple stacks on a truck you need to load over the side that the heel function really only works from the end of the truck without a pain.
This is an older cable style log loader also known as a heel boom loader.
The machine is pretty much a traditional cable crane with a special boom. the special boom fits on just like the standard 'shovel front' or lattice boom. ---at the outer end you see the end sticks
straight up--- This is called the 'grapple riser'. the point of that is, that the pullies (Blocks to a logger) are in the top of the 'riser.' The grapples tend to be fairly long, and with the head block elevated
above the boom you can raise part or all of the grapple up in front of the front end of the boom-- the back end of the log will 'heel' under the more or less horizontal part of the boom and you can use either
hand set tongs (with one cable), or cable tongs (with 2 cables) to grab the log about 10 feet from the end--- then when you lift the near end will come up first and wedge against the bottom
of the boom and as you keep pulling the lifting cable, the other end of the log will rise, and you an swing having the log under pretty good control. But if you want a challege with the cable machine
try and operate it when the machine is off level' as is likely in hilly terrain.....
Hint----with a cable crane-- the swing is friction drive...... and when you let go of the lever the swing usually stops, but if you are off level--- the heavy end swings down---- usually the counterweight end..
this is a dedicated logging machine that could be used either as a yarder or a loader.