Ah, hydraulics... After you get the leak(s) fixed, look up a Caterpillar dealer
and buy some of their anti-chatter additive for hydraulic fluid.
I found out about that when working on my in ground lift. Found a forum post
where a heavy equipment dealer had a problem with hydraulics on some new
machines. The cylinders chattered like mad, but not on the previous batch of
identical machines.
So he took one and flushed its system then drained the fluid from one that
wasn't chattering and put it in one that was. No chatter! That would have been
enough for me, I would have drained the fluid from all of them, mixed it
together in some clean barrels then pumped it back into the machines. Obviously
something in the earlier machines' fluid was preventing chatter.
But not for this guy. He flushed the new machine's system again and filled it
with the new fluid specified by Caterpillar. Welcome back, chatter.
He called up Caterpillar, "Nope we haven't changed the formula for our
hydraulic fluid, not one bit. Sounds like you need to pay us more for our
anti-chatter additive to fix the problem."
Whether they did change the formula without telling anyone, or stopped shipping
machines with the additive already added... Caterpillar found a way to get more
money out of their dealers.
From: Rick Lair <[email protected]>
To: Enhanced Machine Controller (EMC) <[email protected]>
Sent: Thursday, July 7, 2016 5:20 AM
Subject: Re: [Emc-users] OT: X Axis twitch on turning center
Well,
I think I have found the problem, it was mechanical, I just didn't see
it the last twenty or so hours of looking at the machine. This machine
has a 1.5" bore hydraulic cylinder that acts as a counter balance
cylinder for the cross slide and turret, that runs at full system
hydraulic pressure, doing the math, the turret and slide weigh just over
800lbs, and it's a slant bed, so the cylinder is greatly needed. The
seal around the rod of the cylinder is blown, spewing oil out all over,
and I believe the seal it randomly binding the rod, causing a jerk when
the servo finally gets it unstuck.
Now to get it all torn down, and see exactly what went wrong.
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