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Novel skidsteer hydraulics
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Posted by Paul on August 02, 2002 at 05:50:18 from (207.253.204.215):
I just bought a used Case 1845c skidsteer loader and
have been spending the last week or so figuring out
what was going on with the loader hydraulics. Luckily
I had the parts and operator's manual, and received
the service manual just yesterday. First, at some point the auxiliary hydaulics valve
(foot pedal) was removed, but instead of plugging
the supply and return lines off the loader control
valve a hose was run from one to the other. In
effect mimicking a low resistance implement running
constantly. The machine was previously rented out so perhaps the
aux circuit was more trouble than not and someone was
assigned to remove it. Second, that someone's boss must have noticed the now
rather poor performance of the loader and complained.
Must be the control valve, mutters the someone, I'll
just take it apart here and see what's up. Looks ok, might as well put it back together. Hmm,
in which holes to these spools go ? I'll try this one,
ok, works, next one. Hey, fine, nothing to it. Hook
all these hoses back up and let her rip. Oops, boss says detent's now on the bucket. Hey, I see
why, must have switched the spools. No problem, I'll just
switch these tubes here, and it'll be just like I switched
spools. There. What ? Controls reversed ? Dang !
Ha, I see an easy way, bet boss won't ever notice anything.
I'll just bend these here rods so that they cross each
other. There, instant reversal.,, -------- The above fiction was recreated from evidence discovered
working on this machine. It all began when I removed the
offending hose (found while cleaning the machine) and
capped the "power beyond" and return lines. Figured I
was done. Tried things out, lift arms go up... oops.
They don't come down ! Oddly enough if I turn the engine
off and press the lever to lower the arms just a bit,
they lower by gravity and I can hear the oil going back
into the tank. Phew ! For a minute there I thought I
was going to have to crawl out under the upraised bucket. I figure that the improper hose which was providing a
constant leak between supply and return also lets the oil
back in for the arms to lower and that for however many
years the bucket has been lowering through gravity alone.
Hopefully when I switch spools and lines back later today
things will fix themselves, there currently doesn't seem
to be any supply reaching the rod ends of the lift arm
cylinders. All this on a machine with only 1200 hours, sold to me
by a Bobcat dealer with the assurance that everything
was fine, the machine ready to go to work. Ha ! Paul (looking forward to using the thing, one day.)
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