[AT] Allis-Chalmers CA Hydraulic Cylinders

[Gilbert Schwartz]

Matthew; First, the CA uses two kinds of cylinders, a remote cylinder (a
yoke bracket on both ends) and the two cylinders that operate the rockshaft.
(these cylinders use a cap on one end that the attachment pin goes thru and
a hole in the end of the plunger rod that pins the rod to the rockshaft lift
arm.) These two cylinders are the same and each has a hydraulic hose from
the pump valve running to it.
These cylinders have a packing seal around the rod  inside the body to which
the hose is attached. This seal is held in place by a packing nut that the
rod runs through. The nut holds the seal around the plunger rod tight enough
to keep the fluid from leaking. (if it's working correctly). The plunger rod
has, or should have a snap ring attached at it's base, inside the cylinder,
to keep the rod from being pushed out of the cylinder. The entire cylinder
is screwed together with the bottom cap on the lower end. The cap  is
screwed onto a pipe which is screwed into the casting that has the hose
attached.
My feeling is that someone has been into this cylinder before and either
left the snap ring off, or some of the seal and/or seal packing out when the
cylinder was reassembled. The sysem is a high pressure system but it should
not, and will not be able to push the cylinder apart  unless the cylinder is
defective.
I do know that all of this description will be almost non decipherable to
you unless you have a shop manual. I strongly suggest you get a manual.
It'll be of  great help in your endeavours.
I do believe your first step after repair of the cylinder should be to set
the pump for the cultivator.
  Gil
----- Original Message ----- 
From: "Matthew" <matthewx at dogod.com>
To: <at at lists.antique-tractor.com>
Sent: Monday, November 08, 2004 1:55 PM
Subject: [AT] Allis-Chalmers CA Hydraulic Cylinders


>I hooked up the cultivator to my CA this weekend, I had the draw bar on it
> for a long time now.  In fact ti took me a while to find the cultivator in
> the overgroth.  I remebered about where I put it..
>
> Anyway, I got all the pins in place and engaged the pump, and pulled the
> lever and the hydraulics came right to life.  Both the the cylinders weep
> a little but they have done that for years.  All seemed good until I went
> to lower the cultivator into working position; nothing happened.
>
> After shutting it off and taking a closer look at it, it seemed like the
> cylinders overextended a little bit and locked in the piece they pivot
> against.  I took the bolts holding the cylinder rods off of the piece
> they push against, which was all very tightly jammed together, and as
> soon as I had one rod disconnected I could get the thing to come back
> down.  What was odd was that cylinders rod fell right out of the cylinder
> when I put it down.  There is a ring around the end of it that looks like
> it should have some sort of a keeper on it that is missing.  I did not
> see it in the cylinder though.  The other side the rod stops before it
> falls out.
>
> Are these cylinders repairable (ie new keepers and packings) or should I
> start looking around for a new set?  If they are repairable who would have
> parts?  How do they come apart?  The front (rod end) looks to be perm.
> attached.
>
> Any advice is appriciated!
>
> --Matthew
>
>
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