I'm the 2nd owner of a 1978 NH 1425 that the 1st owner estimates has baled a million bales already. The rear axle seals are shot and gear lube has saturated the brake shoes rendering them useless. I'm trying to replace the rear axle oil seals. This machine has a final drive reduction gearbox at the outer end of each rear axle. Thus the actual axle is a very short thing supported by a pair of tapered roller bearings seated in the massive cast iron reduction gear housing. Here's a photo of the overall situation (wheel removed:
On the back side of the reduction gear housing there is a stamped metal dust cap (like you find on the outside of a typical wheel hub). I removed the cap and then removed the castellated nut from the axle shaft. Here's what that looks like now:
Next I removed all the bolts that hold the two halves of the reduction gear housing together and, using a chisel sharpened to an acute angle, separated the two halves...barely. For sure the two halves are broken loose from each other but I can't get them to actually move apart from each other.
My current theory is that the inner race of the inner tapered roller bearing (visible in the photo above) is stuck on the axle shaft and therefore not allowing the axle and big gear and everything else to slide out. I tried beating on the inner end of the axle with a 4lb sledge (protecting the axle end with the nut and a block of Al) but I can't really get a good swing at it and it didn't budge.
It strikes me as odd that this bearing is stuck on the shaft. That would seem to defeat the purpose of having opposing tapered roller bearings and a castellated nut for adjusting the play in the bearings.
If anybody out there has been through this before and can shed any light, I would be most appreciative....!!
Scott
NH 1425 self-propelled baler rear axle removal
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