connected to a supportive frame member 26 which is a guard for the chain 22 and sprockets 18 20 member 26 is ultimately connected to and supported by the main frame 27 of baler 10 member 26 includes a substantially planar portion 28 having a first side 30 adjacent sprockets 18 20 and a second opposite side 32 a lip portion 34 overhangs a first portion 36 of main drive chain 22 idler apparatus 24 engages a second portion 38 of main drive chain 22 idler apparatus 24 includes a first adjustment member 40 and a second adjustment member 42 first adjustment member 40 is preferably a steel arm pivotally connected at a first end 44 adjacent first side 30 of member 26 by a bolt 46 or the like an idler member 48 preferably a sprocket type wheel is suitably connected to a second end 50 of first adjustment member 40 by a bolt 52 or the like so as to rotate relative to second end 50 when urged into engagement with chain 22 second adjustment member 42 is also preferably a steel arm pivotally connected at a first end 54 adjacent first side 30 of member 26 by the bolt 46 note however.