Re: Re: Novel skidsteer hydraulics

Posted by Paul on August 06, 2002 at 06:20:43 from (207.253.111.115):

In Reply to: Re: Novel skidsteer hydraulics posted by RickB. on August 03, 2002 at 06:18:41:

RickB writes :

>Capping a power beyond port on a open center control valve without
>altering the porting to flow 'unused' incoming oil directly to the
>return circuit will destroy the system's pump in short order.
>Eliminating the aux hyd valve and connecting the PB port of the
>loader control valve to return is one correct way to eliminate
>the aux valve.

I'd appreciate more on this subject. The reason I capped the
power beyond and return ports was because in the parts manual
the drawings show the caps present on machines "without auxiliary
hydraulics". There is no other information anywhere, not even
in the service manual, on what to do if you want to add/remove
the aux hydraulics.

I'm new to hydraulic mechanics (so don't know much about what
I'm talking about :-) but I don't see how running a line between
PB and return doesn't rob the whole loader circuit of its power.
Why would the fluid bother to push on a cylinder rod if it can
just squirt directly over to the return line and back into the
tank ?

Over the weekend I switched everthing back to what is supposed
to be correct according the the manuals (which are a bit out of
date, 1991 directly from the Case dealer, the machine is 1995)
and now everything (seems to) work properly so unless Case
decided later for some strange reason to reverse the entire lift
arm and bucket circuits everything should now be ok. I don't
really understand why switching control valve spools and lines
should have had any effect (except on the 'float' function) since
both spools and circuits look pretty much identical.

The machine is now ready to go. I changed all the oils, all
the filters, flushed and changed the cooling system, dismantled,
cleaned and lubricated all the linkages, replaced all the
little plastic bushings in the controls, painted the places
where the paint had rusted off, greased everything and gave
it a good bath. Took most of two weeks. (Felt like I was
restoring an old tractor :-)

Yesterday I changed the chaincase oil. On the left there was
hardly any oil and on the right the case was half full of a
mixture of water and oil (yuck !) due to an improperly installed
access cover. I generated 93 liters (about 24 gallons) of
waste fluids, currently stored in jugs and buckets, now I have
to find out where I can get rid of all of it...

Cheers,

Paul (should get around to doing some landscaping later
on today :-)

Follow Ups:

• Re: Re: Re: Novel skidsteer hydraulics RickB. 14:23:41 08/06/02 (1)
  • Re: Re: Re: Re: Novel skidsteer hydraulics Paul 13:48:57 08/08/02 (0)

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