I'm glad to hear you have the four extended mounts. Yes they go on the four center rows withlong parallel links.

There are several different ways of equipping that planter. Often folks use the 1572 coulter combo on the corn rows. Screw the Trashwheels down when planting corn and screw the Trashwheels up when planting beans so you essentially have coulters all the way across when planting beans.

The coulters can also be easily removed (one bolt) if it's soupy wet and you want Trashwheels only.

By the way a 20mm socket on a driver drill (not an impact) with a socket adapter and extension lets you adjust or raise our Trashwheels very quickly without crawling under the planter. Use a driver/drill with a clutch rather than an impact.

I am concerned about your comment about running what sounds like our Narrow row combo setup on some rows.

JD made the lift wheel weldments wider on the NT and 1790 series planters than on the previous std 1770 series. This leads to some real tight spots on the row units between or next to a lift tire. On the 1790 with the coulter centered you must have our new smaller 12.75" dia swept back toothed wheel if you use the centered coulter on many rows, not our std 14" radial toothed wheel. The 12.75 wheel has pn 101550 forged into it. The 14" wheel has pn 2000015 forged into it.

As far as pointers on that planter - you have 8 bean rows planting directly behind a high pressure truck tire. It really helps emergence on those 8 rows especially to run two Curvetine closing wheels per row, even if you have the std unit mounted coulter.

Regarding coulter depth: that unit is designed so that with a new coulter and new vee openers, with the coulter hub in the center of the three holes the coulter blade is theoretically 1/8" above the bottom of the vee opener/seed trench. As this is not a new planter you should look at wear on the coulter and openers. The goal is to have the coulter no deeper than the seed, and preferably just above the seed depth with the planter running level. By the way you should use 5/8 flat washers (not the older lockwasher) and a 5/8 x 1-3/4" grade 8 bolt on the coulter hub. If you have to use 2" use a couple washers to take up the difference in length. The Trashwheel hubs use the 1-1/2" long bolts. Use hard flat washers on those also rather than the older lockwashers we used to ship.

Give us a call at 800-554-0007 if you have any installation questions.

Regards,

Jim at Dawn