CASE 60XT TANDEM PUMP LEAK

I HAVE AN '03 CASE 60XT THAT HAS A LEAK IN THE TANDEM PUMP. I DON'T HAVE KNOWLEDGE OF THE CORRECT PART VERBAGE, SO BEAR WITH ME AS I DESCRIBE THE LEAK LOCATION. THE LOCATION IS AT THE REAR PUMP CONTROL. WHEN I SAY REAR, IT WOULD BE END OF THE PUMP OPPOSITE THE FLYWHEEL. THE OIL IS COMING UP FROM THE PINTLE OR SHAFT THAT THE CONTROL STICK LINKAGES ARE CONNECTED TO. HOW BIG OF A PROBLEM AM I LOOKING AT? IS THERE A SCHEMATIC OF THE TANDEM PUMP THAT SHOWS HOW THE CONTROL IS ASSEMBLED? LET ME KNOW WHAT YOU FOLKS KNOW. THANKS!