I am using the suzuki samuri alternator with the
voltage reg removed. I have a seperate Ford style
regulator. The battery is an RG25 by concord.

As for the low side hydraulic pressure, shouldn't that
side be open to the resevoir when the gear is up
keeping that side at 0? I am not entirely sure how the
hyd pump operates as it relates to pressure on the
oppisite side of the system when it is running.
When I originally installed and tested the gear I
could open the dump valve and move a gear leg by hand
up and down with little resistance. Now when I do the
same thing (open the dump valve on the jack stands and
push the gear up by hand) I notice there is some
resistance or building pressure as the gear leg is
pushed up into the wing. I am not sure what has
changed or if this is normal. With the dump valve
open, what would cause the building resistance? I
would think that whatever the position of the gear,
the opposite side should be open to the resevoir at
the pump.

Randy,

 

I am not familiar with the alt/reg/bat combination that you are using.  You may also want to check Concord specs for the charging voltage and make sure that the regulator is in the required range as there have been plenty of stories about the consequences of regulator output not matching the requirements of the battery.

 

Yes, the opposite side should be zero pressure.  The dump valve has failed to resolve cases where the pressure on both the up side and down side are high enough to not allow either motor power relay to engage nor bleed off any pressure and usually manifests itself by not allowing the pump to be activated to raise the gear.  Remember that the dump valve short circuits the fluid path to bypass the pump altogether and connect the up and down sides of the actuators together thus allowing free flow of fluid even if the total system pressure keeps either pressure switch from connecting power and that is a pump problem.  However, the gear should still free fall - certainly the nose gear pushed by the 100# gas spring and the spring opened doors - or allow one to hand raise the main gear with the volume of flow being the only resistance.  Could there be blockage in the system not associated with the pump?  You may want to isolate components to test for restrictions in or out a component.   ?????????????