Hi; In the unlikely event anyone is still following this marine
blunder ... here is the status as of 28 August.
Same symptoms: Wheel stops when turning to port / but turning to starboard wheel continues to turn when RAM at full travel.
Suggestions, even by Paul Wagner, is that there is a problem in the helm pump.
The helm pump is the worst nightmare to get out of the binnacle.
So looked to eliminate possibilities by starting at easiest things to get to.
There are no bleeding fitting on the RAM.
A slim friend crawled into the 24-inch high compartment to crack the RAM's connection - while I turned the wheel to STBD = one tiny burp of air.
A week later a friend crawled in, removed the RAM from it's pins, tilted the stbd end UP and cracked the connection while I turned the wheel = maybe a tiny burp of air but same problem. Wheel still continued to turn beyond RAM all the way in. ???????????
SOOOOO (not easy) opened and terminated the plumbing
coming from the helm PUMP = wheel now comes to a HARD STOP both ways. Could not turn the wheel in either direction.
Another SOOOOO ... removed the RAM, broke out crackers & cheese and a bottle of red AND sent the RAM to British Hydraulics. It is there as I type.
It is assumed there is a one direction internal seal leakage within the RAM cylinder. Be interesting to see what British Hydraulics has to say.
Pete and EVERYONE for your suggestions.