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over excitation shutdown problem for 3512 diesel generator

please give any advice to me..

 

i have using caterpillar 3512 generator from last 4 months in my company. my company recently purchased(second hand) from zahid tractors,dammam,saudi arabia.over excitation shut down problem started from last 2 months.fault occurs after 1hrs,10 min sometimes 8hrs no time..i have checked all connectors,fuses,diodes and exciter resistance(13ohms).IR value for exciter field >400Mohms@500v.but problem not rectify.finally cat service engineer came and he said CDVR problem,replace with new. my company purchased (12000SR)new CDVR from CAT service and installed by cat engg.again over excitation problem occur after 2 days.again cat engg said exciter winding problem.but my company manager angry with this problems.cat service engg not comig to my site.please give any sugession.