AN MD80 WAS DISPATCHED ON A MAINT FERRY IN NON COMPLIANCE WITH MISSING ENTRY IN FLT LOG.

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CREW DISCOVERED R HYDS DOWN TO 3 QUARTS AND HYD FLUID ON BOTTOM OF L WING. I WAS DISPATCHED; SVCED R HYD TO FULL; CLEANED FLUID FROM L WING AREA. PRESSURIZED HYD SYS; NO LEAK NOTED; RAN MORE CHKS WITH MAINT CTL GUIDANCE; STILL NO LEAKS NOTED. I REFUSED RETURN TO SVC; HOWEVER; I WOULD SIGN FOR FERRY PERMIT. MAINT CTL WAS ANGRY. DISPATCHER UPSET. AFTER MANY PHONE CONVERSATIONS (BITTER ONES) A FERRY PERMIT WAS ISSUED COMPANY X CHKLIST WAS FAXED TO HAVE COMPANY Y NOT COMPANY Z OPS; SO I NEVER SAW UNTIL AFTER FACT. I SIGNED OFF WRITE-UP OF LOW R HYDS AS SVCED R HYD SYS; OK FOR FERRY FLT FROM ZZZ TO ZZZ1 ONLY. BECAUSE OF MY ANGER AND HARD FEELINGS CAUSED BY EARLIER CONVERSATIONS; I DID NOT WANT TO TALK TO ANYONE FROM COMPANY X. I SENT ACFT AND CREW WITH ONLY THE ORIGINAL LOG ENTRY CLRED AND A FERRY PERMIT. I FAILED TO PROPERLY FOLLOW COMPANY X PROTOCOL DUE TO MISSED FAX AND ANGER BROUGHT ON BY COMPANY X PERSONNEL. CONVERSATION LATER IN THE SAME DAY (APPROX XA00 HRS) BY A COMPANY Z AIRLINES SUPVR CALMED THE AIR. I MADE AN ENTRY ON THE CHKLIST AS I SHOULD HAVE IN LOGBOOK AND FAXED FOR ATTACHMENT TO LOG RECORDS. ACFT WAS SAFE FOR A 1 TIME FERRY FLT WITH MINIMUM CREW. I DID NOT FEEL ACFT WAS OK FOR REVENUE FLTS UNTIL IT WAS CHKED OUT BY A TRAINED MD80 MECH IN ZZZ1.