Combine service

[Days of thunder]

i want to give my combine a thorough service this winter my 7272. One of the issues I had this year was the front of the drum kept blocking up didn't seem an awfull lot in it really opened up and wound it out a lot of times especially in osr. The belt wasn't slipping but wonder if it's driver error maybe not got right concave speed or something else I could look at. It would also do it in wheat if I tried to push on too much any ideas very welcome.