Posted by Wardner on August 29, 2009 at 13:22:30 from (4.154.240.246):
Last winter while plowing snow, I noticed that my front wheel assist on my 660D was no longer working. I immediately parked it as i didn't want to cause any further damage.
I just got around to investigating the problem. I disconnected the front driveshaft and determined that the axle was OK. I removed the transfer case cover (for the first time) and that seemed to be OK. I tried shifting the IH tranny and found out that the 4th/5th slider gear rail would not move. I removed the IH shifter and found the all-too-common problem of non-aligned shifter rails while in neutral. The sliding gear was too far back and the shift lever could not grab it. Everything is back together and working well. Whew!!!
I learned a few things while working on the tractor. I had assumed that the Elwood sliding gear got its power from the top of the 4th/5th IH mainshaft sliding gear. That was correct. I didn't realize that all-wheel-drive was not available in 4th. The Elwood gear won't fully mesh when the 4th/5th slider is running in 4th. Elwood should have made that gear double width. I can't see any reason why that wouldn't work. There is enough room.
Outside of transfer case. Dirty thing at top is 660D air cleaner. Black thing at right is a Fisher snowplow valve. Elwood sliding gear is below air cleaner.
Shot from right side. It appears that the vertical triplex chain lifts oil out of the lower reaches of the chain box.
Shot from left side. The Elwood sliding gear is over the 4th/5th slider. Belt pulley gear at left. Constant mesh gear to its right.
Shot from left side. Elwood sliding gear is disengaged.
If the 660D 4th/5th slider tooth count is the same on M. SM, SMTA, 400, 450, 560 this transfer case will work on those tractors. Chain sprockets will have to be changed to account for different tire sizes, differential gearing, and the 660 planetary rear hubs. Not a big deal as it seems the sprockets are standard power transmission products.
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