"I know it was overcharged because the high cut off pressure switch kicked in at 200 psi. Let some out and rean fine for approx 3 months. To long of run times so let some more out ran fine and then next time started bogging down the 6 hp Kubota."
Overcharging is not often the cause of high pressure because the refrigerant just condenses into more liquid. UNLESS!
it's so overcharged (Danger Will Robinson!) there in no place for it go and something has to give.
(seals, connections, relief devices) High condensing pressure is most often caused by restriction, blocked or failed air flow, or water flow (As in your case) on the condenser side
. Your condensing water temp rise seems high. Richard may have a better awareness on it as I'm just generalizing. I am however going to say; CHECK THE CONDENSER!
or try running COLD water through it if possible.
The SD5 is fixed displacement
and has 5 pistons. Not much information on their site.
found this; http://www.seafrost.com/pdfs/ED/MANUAL%20ED-134.pdf
FOR UNITS IN TROPICAL WATERS
THIS IS THE MOST IMPORTANT PROCEDURE. A FULL FLOW SEA FROST
CONDENSER WITHOUT A ZINC OR WITHOUT THE BONDING STRAP
CONNECTED WILL LAST A VERY SHORT TIME. BE SURE TO CHECK THE WEAR
. REPLACE EVERY SIX MONTHS OR SOONER IF INSPECTION
REVEALS EXCESSIVE WEAR.
IF THE ZINC BREAKS IN THE BRASS PLUG
, REMOVE THE REMAINING ZINC BY
MELTING IT WITH A PROPANE
CONDENSERS WILL SCALE AFTER SEVERAL YEARS IN WARM WATER CAUSING
HIGHER HEAD PRESSURES DUE TO THE SCALE INTERFERING WITH THE HEAT
REMOVE THE ZINC AND PLUG
THE HOLE IN THE CONDENSER
WITH A 3/8” NPT PIPE PLUG. WARNING: LEAVING THE ZINC IN PLACE MAKES A
UPON ADDING ACID. THIS WILL PRODUCE HEAT AND SMOKE.
DON'T FORGET TO REMOVE THE ZINC. REMOVE THE TOP HOSE ON THE
CONDENSER AND POUR *MURIATIC ACID INTO THE CONDENSER UNTIL IT
BOILS OUT THE TOP.
WARNING: BE SURE TO FOLLOW SAFETY
PRECAUTIONS ON THE MURIATIC
��MOST MURIATIC ACID IS BOTTLED AT 5%-7%. THIS CONCENTRATION IS
WHAT WE RECOMMEND.
BOILING (FOAMING) WILL STOP IN (4 OR 5 MINUTES. THERE IS NO DANGER
DAMAGE TO THE CONDENSER. RECONNECT HOSE TO THE ENGINE AND
START THE ENGINE WITH THE THROUGH HULL
OPEN. AFTER A MINUTE OR
TWO OF OPERATION TO FLUSH OUT THE ACID,