Question about New Idea 5209 discbine

I just bought a used New Idea 5209.  It's the older style, not exactly sure of the age.   A neighbour used it to cut some pretty heavy messy stuff last night and it ran like a champ.  I bought a new set of blades for it.  Does anyone know the torque specs for the blade bolts?  The previous owner apparently changed all the fluids in the cutter bar at the start of the season and then traded it in. All the joints are tight and well greased.  Is there any other routine maintenance that I should be doing to it?  Can anyone point me to where I can find an owners/operators manual for this unit?

 

Thanks

Dave

Question about New Idea 5209 discbine