[AT] Add-on hydraulics and power steering?

[Dudley Rupert]

John,

The back fifteen or twenty pages of the 2004 Hydraulic Parts Components
catalogue from Force America contains a good tutorial on hydraulics.  Their
website is www.forceamerica.com and their number is 888-99FORCE.  I don't
have their latest catalogue but I would guess that it would also include
this tutorial information.

A hydraulic pump can be used for both power steering and another application
like say a loader.  However, to maintain the performance of the power
steering system while both turning and using the loader requires a Flow
Divider (or something that works like it).

A Flow Divider is like a Y valve with one input (which is connected to the
pump output) and two outputs.  One output is connected to the power steering
and the other to the loader.  The function of the Flow Divider is to ensure
that a minimum flow of hydraulic fluid is always diverted to one of its'
output ports.  Let's say power steering needs a minimum of 3 GPM to function
properly (I have no idea if this is anywhere near correct).  Then,
installing a Flow Divider with a 3 GPM rating on one of its' output ports
for the power steering could be used.  The loader, which is connected to the
other Flow Divider output port, will then only get what the pump puts out in
excess of 3 GPM.

FWIW - I have seen several tractors with power steering that used a Flow
Divider but not also with a loader - usually just a function that required a
single actuator like an add-on 3-pt hitch.  For a loader application I think
I would want dedicated pumps for both the loader and power steering, as I
wouldn't want the loader performance to suffer any while turning.

Dudley
Snohomish, Washington



-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com]On Behalf Of Larry D Goss
Sent: Sunday, April 22, 2007 7:18 AM
To: Antique tractor email discussion group
Subject: Re: [AT] Add-on hydraulics and power steering?

Are you sure the pump is turning the right way?  Some pumps have the
pressure relief valve built into them and won't run backwards.

Larry

----- Original Message -----
From: "John Wilkens" <jwilkens at eoni.com>
To: <at at lists.antique-tractor.com>
Sent: Saturday, April 21, 2007 11:15 PM
Subject: [AT] Add-on hydraulics and power steering?


> Anyone know of a good book on very basic practical application of
> hydraulics and old tractors?  One specific is...can you use a front
> or rear mount hydraulic pump that is being used to run a loader (etc)
> to run an add-on power steering unit also?  What capacity pump would
> be required?  What kind of plumbing and fixtures would be
> needed?      Also, can a pump be too big to run such a system.    I
> tried to run a wood splitter off of a large BeeGee pump hooked up to
> the belt pulley shaft on an AC WC tractor (came off of a Cat) but
> about all it did was heat up the oil and stall the tractor.  One guy
> told me the pump was "just too big."  ???
>
>                    In the wide-open spaces of NE Oregon
>
>
>
> _______________________________________________
> AT mailing list
> http://www.antique-tractor.com/mailman/listinfo/at
>


_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at