Thanks John! That sounds like the sort of info
we needed. . we'll give it a whirl on Friday and
see what happens..
Much appreciated



Tom Miller
"John" wrote in message
...
Tom Miller wrote:

I volunteer at the local science
museum,rebuilding old machinery. Mostly steam
and
early diesel tractors and road rollers. We have
a
pretty good shop with a selection older, but
good
solid machine tools. Among them is a Cincinnati
horizontal mill No.2 M1 ( serial F5409-6) made
in
1946. Another of the volunteers(No , it really
Wasn't me) pulled the gearbox selector assembly
off the side of it as the machine appeared to
be
seized. It appears that it somehow selected two
different gear ratios at once. It appears also,
that the gear selection is done hydraulically
by
pistons which push selector arms in response to
the position of a multi-port valve .The
question
is -how do you get the selector arms in the
correct position to re-assemble it. We will
probably have to replace the "o" rings on the
pistons as that is possibly why it selected two
gears at once.
Does anyone have any experience with this or a
similar machine? Am I looking in the correct
areas
and are my suppositions reasonable?

We spent 2 hours today (and a fair amount of
bad
language) trying to get those selectors in the
right positions to re-assemble it.

Tom Miller




Ive repaired quite a few of them so maybe I can
be of some help. To
line up the shifters you should pull off the
outside and inside plate on
the opposide side of the mill. This will gain
you access to the inside
of the machine so you can make sure all three of
the shifter yokes are
in the proper place. You have to set them up in
the apporximate
position and guide them in as you put the
shifter housing in place. Make
sure you get the little O rings in place at the
bottom of the shifter
housing.


The first thing to do is to check the hydraulic
pressure on the shifter
system. There is a port on same side as the
hudraulic shifter unit that
allows you to measure pressure. I leave a gauge
right in the port so you
can keep an eye on it on a continuing basis. I
think the pressure
settin should be about 300 lbs/ inch. The
pressure adjustment is in the
back over to the left of the main drive pulley.
It should have a plate
on it marking it as such.

I would suggest you should get a maintance
manual of your particular
machine. The information above is from my
experience working on #4's
and bigger, but they are all basicly the same.

When shifting gears, there is a lot going on
inside of that machine.
Make sure that the motor is turning the right
way. There is an arrow on
the main drive pulley that indicates the proper
rotation. If you have
proper rotation you will have hydraulic
pressure. The gear pump is
driven off the input power shaft before the
clutch. One big problem is
the pickup oil screen. After years of use it
will get gummed up and
will cause the oil pressure to drop.

You can check that the shifte forks are free.
They should move easily
with a little hand pressure. Watch out for the
residual oil that will
be pushed out of the input ports.

Watch out, cinci uses double set screws in many
places. You have to
measure the depths to make sure you got both of
them out if you are
removing a part.



John