There is a thread in Repair on this but I'd like to get as much response as possible to this inquiry.
In short, there is a problem with 4000/40ten series rear wheel bolts coming loose, and a mystery as to why and how best to solve it.
I just took delivery of a 4410 with R4 tires. The wheel bolts were standard hex head M14 grade 8.8's with a flat washer under the head. Having read TBN first! I was prepared to replace my wheel bolts with longer ones and back them up with nyloc nuts on the back side of the flange.
I was not prepared to find, on removing the first bolt, to find that the wheel holes are tapered to accept taper headed bolts.
This is how loads are usually transferred fron wheel to axel: through the taper on the bolt head (or nut in cars) to the bolt or stud. The fact that the wheels were designed this way makes me think that using ordinary head bolts may be the problem. Not only is the load now being transferred only through the fit of the large center wheel hole over the center bulge in the mounting flange, but the friction that a tapered head bolt has with the tapered hole to keep it from loosening is lost; it fact the flat washer under the heads of the regular bolts makes the friction point way too low at rated torque, in my opinion.
So now the point of this post: If you have had wheel bolt loosening problems with the 4000 / 4000 ten series tractors,
PLEASE RESPOND wth what type wheel bolts you have, regular flat head or tapered head; and if you have the time to pull a bolt and look, at whether your wheel holes are tapered or not. Maybe we can get this figured out.
In short, there is a problem with 4000/40ten series rear wheel bolts coming loose, and a mystery as to why and how best to solve it.
I just took delivery of a 4410 with R4 tires. The wheel bolts were standard hex head M14 grade 8.8's with a flat washer under the head. Having read TBN first! I was prepared to replace my wheel bolts with longer ones and back them up with nyloc nuts on the back side of the flange.
I was not prepared to find, on removing the first bolt, to find that the wheel holes are tapered to accept taper headed bolts.
This is how loads are usually transferred fron wheel to axel: through the taper on the bolt head (or nut in cars) to the bolt or stud. The fact that the wheels were designed this way makes me think that using ordinary head bolts may be the problem. Not only is the load now being transferred only through the fit of the large center wheel hole over the center bulge in the mounting flange, but the friction that a tapered head bolt has with the tapered hole to keep it from loosening is lost; it fact the flat washer under the heads of the regular bolts makes the friction point way too low at rated torque, in my opinion.
So now the point of this post: If you have had wheel bolt loosening problems with the 4000 / 4000 ten series tractors,
PLEASE RESPOND wth what type wheel bolts you have, regular flat head or tapered head; and if you have the time to pull a bolt and look, at whether your wheel holes are tapered or not. Maybe we can get this figured out.