Jonsered FR2312M Workshop Manual page 38

Repair instructions
4 Lift off belt 1.
5 Remove the spring for the belt tensioner for belt 2
(transmission belt).
38 – English
6 Remove the cover on the left hand side of the
rear carriage.
7 Pull off belt 2 from the transmission, first from the
rear belt pulley and then from the front.
8 Pull off belt 3 at the front, lift it over the lever arm
of the cutting unit, then lift it off at the rear.
Fit the belt in the reverse order.