RPM
Guest
First get the serial number, year can be inaccurate, serial number doesnt lie, 1680 started 1986 with 18001, 1987 JJC0028001, 1988 JJC0036301, 1989 JJC0045351, 1990 JJC0047025, 1991 JJC0115001, 1992 JJC0117060, Cummins_CDC_NCE started at JJC0045689. I doubt if it has any of the 1688 fan or sieves in it. Fan was a conversion that sells for about $1500. Sieve was only put in last 1680, 1991_2, would be a difficult conversion to change, no package was made or listed by CNH.