[AT] I need help on 3 pt

[dfolske at nccray.net]

Most modern tractors have pressure lubricated transmissions and rear ends. They don't 
need hydraulic pressure to operate unless they have a power shift unit of some kind but 
simply pump the oil to where it's needed like an engines oil pressure system. some use 
separate pumps but some use the main hydraulic pump. 

If the system uses the main hydraulic pump for transmission lubrication there could be another pressure relief valve or a bypass valve.
 I've also seen an internal tube broken which allowed the full flow of the pump to dump 
into the transmission with corresponding loss of pressure.

I think some tractors use a flow divider valve to provide priority first to the power steering, 
second to the lubrication system and third to the 3pt or remotes

On 28 Mar 2005 at 12:37, Clint D wrot

> > Clint,
> >
> > Does your hydraulic pump provide pressure lubrication for the
> > transmisssion?
> >
> > Is it possible you have a transmission lubrication line unconnected inside
> > the transmission and it's acting like an open pressure relief valve?
> 
> 
> This is interesting? how could I tell if it provides pressure lubrication to the
> trans?  as far as I can tell so far, this pump provides hyd. for the 3 PT,  Power
> Steering and aux hyd's
> If this was the case? would I have pressure to run the gears? The trans gears are
> working, packs, etc.
> 
> Clint
> 
>