Hi all,
I have been busy working away on my ex-Willis Jeep Koenig winch, adapting it
to my S1-80". This winch is somewhat different than the LR specific, crank
drive Koenig winch, although it looks almost the same.
The mount points are at the centerline of the winch drum, rather than the
base of the clutch case as in the LR version. Also, it doesn't have the
chain drive-transfer case with dog clutch assembly to connect to the LR
crankshaft. Instead, the winch input driveshaft extends 2" out from the back
of the winch, through a cast aluminum mounting plate. Originally, a PTO
driven driveshaft connected direcly to this input shaft. On the other side
of the winch drum, the support casting is much shallower than the LR version
(similar to the Koenig LR PTO winch).
First I had to determine how to drive the winch. I looked into building my
own crank drive assembly, AKA the Koenig LR winch. That is, until I
borrowed an actual Koenig LR crank drive winch and took apart the chain case
to see what was inside to engage and disengage it from the LR crankshaft.
It has what is known as a dog clutch engage/release mechanism. For any that
don't know, this is a mechanical affair that consists of two major parts, a
driveshaft with two arms sticking out that spin like the blades of a
lawnmower, and a transfer shaft with two forks. The transfer shaft rides on
the driveshaft and is slid into the driveshaft arms so that the forks engage
the arms, driving the winch.(clear as mud, eh?) It is pulled back to release
the winch.
This is a BRUTAL affair that doesn't deserve the name "clutch". Engaging the
clutch while the engine is running puts untold impact load on the
crankshaft. I have heard horror stories of broken cranks caused by owners
banging the clutch into and out of drive mode, although I don't any first
hand knowlege myself.
Thus I decided to look for another way to drive the winch. OK, PTO? Well,
on an 80" it is almost impossible to route the various driveshafts to the
winch. Just not enough room. If I had a RH drive 80" I might have been
able to do it, but not with the pitman arm on the LH side. I also thought
about adapting a motorcycle clutch to the winch and driving it from the
crankshaft. A bit too much effort to do all the machining to adapt it, and
what about keeping it clean in the mud? Got to be another solution.
At this point one of my friends suggested that I drive it hydraulically like
the LR S11 factory hyd winch. My response was "What factory LR S11 hyd
winch?" Now, you have to remember that I have some serious gaps in my LR
knowledge. If it was made after 1958, I have little knowledge of it. In
fact, I have only owned one LR and that is my 1952 S1 80". OK, get a S11
manual and look at the diagrams. This could work. The hyd pump is driven
from the pto, the hyd motor is connected to the winch, there is a hyd
control valve, a 4 gal hyd fluid reservoir tank, various fittings, a filter
and a bunch of pressure lines connecting everything.
OK, go on the internet and start learning about hydraulics. It turns out
that for 8000lb of line pull, at 30 ft/min wind in rate, I need 500 in/lb of
torque at the input shaft. This translates to a hydraulic motor/pump
combination that pumps 10gpm at 1000rpm at ~1000 psi. (Whew! Got all that?)
Out I go to price this stuff at my local hyd dealer. I almost passed out at
the prices. $300 for motor, $600 for pump, $150 for ctl valve, $250 for
lines, $200 for all the filters and fittings .... even at Canadian $$'s this
is pricey, and doesn't even include the costs of building a tank or frame to
mount the winch! Well after several weeks and some real serious sleuthing,
I managed to source used motor, pump and valve for the princely sum of
Cdn$300. Even comes with a 90 day warranty.
Currently, a friend and I have welded up a new front bumper with the winch
mounts built in, the winch rear mounting frame with built in mounts for the
hyd motor, and have mounted the unit to the 80". Looks pretty good.
Over the next month I will install a PTO in my transmission and mount the
pump to it. Then I will build the reservoir tank, get the pressure lines
made up and mounted, and try it out.
Work, work, work, work... I sure hope it is going to be worth it. My first
roll of pictures should be developed this weekend. :)
Martin Rothman
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This archive was generated by hypermail 2b30 : Fri Apr 20 2001 - 14:43:08 EDT