I had the info at one time, but can't locate it. Check with your dealer.
This was an issue on 2388s, so there was an orifice added, but I'm not sure what model year it was. Our 2002 doesn't have the orifice, and the header engages fast. The problem this causes is that when it does engage, it can bottom out the belt tensioner on the right side (the one right by the front tire, on the belt going to the header. For us, the tensioner broke, which is why I learned about this.
A few years ago done in Kansas on the harvest run we were running a fairly old 1010 straight head and we didnt have the orfice put in and we snapped the shaft that moves the auger fingers. We ended up buying a brand new 1010 from Hoxie, KS. Ever since then we have had the orfice put in, but we went to a 8010 last year. We put a bunch of them in at work too.
This just happened to us today! How has it always been fine and then this year the first day it destroyed the idler pulley in 1 round! Luckily I had a spare assembly off an older machine but ordered the parts to rebuild the old one. What caused it to do this? I noticed before it happened the header was turning on harder than normal? Did the orifice blow out you think? I thought maybe it was it was adjusted to tight? But I'm not sure now? Bout ruined a new belt too!!
We did have all the shieves resurfaced and cut down because they were in bad shape and then we freed up the plate deal that the belt rides on? That arm was frozen and before it was bending the plate its mounted to with the rod if that makes sense? So maybe before it was all worn out and then that rod was froze so it have it softer start??