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STX450 Tranny Pics.....Back together and running...
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ChrisTN
Posted 11/18/2009 21:29 (#929478)
Subject: STX450 Tranny Pics.....Back together and running...



Ethridge, TN

Got the last of the parts I needed on Friday of last week. Tried to send everybody somewhere else on Saturday, while I put it back together. Idea was to try and eliminate any interruptions, but most can probably about figure how well that plan went. So it ended up taking all day, but I probably had only about 6 actual hours in putting the tranny back together and shimming all the shafts. The latter took most of the time. Put the unit back in the tractor, put the cab back on, and did some road testing on Sunday. Loaded it on the detach Monday morning and hauled it to the farm where it got it's field test. Otherwise, it would have been drive it across town, and since this is the first time I've tackled one of these, I'd rather have had any surprises on the farm, than the roads between the shop and the farm.

Ran all day Monday pulling an 11 shank Blujet Subtiller, set just a little over 12" deep to get below the compaction. We are trying to subtill the fields where the river came out on them twice this year, to loosen that ground back up some. Ran smooth all day with no warnings/codes being set. No aparent leaks, and all the shafts that can be checked seem to still be set proper, ie. nothing seems loose. So hopefully, the problem is solved. About $3k in parts, and probably a total of about 22 hours of labor. In and out would be a little faster on the next one, but I'd just as soon it not become a habit.

I did get a few pics taken.

Here is what is on the inside of the tranny. i do have the 5th shaft/output, removed at this point.

 

These are the parts that are removed so you can split the case. I just took a pallet, and piece of cardboard so I could label what came from where. The big pan goes under the fifth shaft.

 

This is the top of the case, or the front if it was in the tractor. I left the shift block attached, as you really don't have to pull it to split the unit. I didn't get any pictures of the under side, but there is a web of tubes that direct the oil from the shift block to the correct shaft ports to make it function. You check those tubes by gently striking them. If they are seated and have no cracks, the book says they will resound like a tuning fork. Little skeptical at first, but it does work. There is no gasket used between the front and rear covers. It is sealed with form a gasket type product.

 

Another shot of the tranny and the removed cab. Cab removal isn't to bad as long as you have soem colored pull ties. Makes it easier to code what hose goes to what fitting. Now there are a couple lines that connect to the tranny that are fun to get loose, or back on for that matter. Required fabricating a special wrench to get the job done.

 

No cab & no tranny. Takes a good loader if you don't have an overhead hoist. Used the JD7320 with pallet fork attachment on the loader. About all it would reach to pluck the cab off.

 

 This is the hole you have left when you get it extracted. That is the hydraulic pump hanging off the piece of channel. Don't have to disconnect any of those lines if you do it this way. It also shows the coupler is still on the pump shaft. for reassembly, you do want to place that coupler on the tranny shaft. Otherwise you can't get the two to slide back together, I know, tried it the way it is pictured first, doesn't work. Took little effort once I realized the "correct" way to do it.

 

 Here is the problem shaft. I have already removed the ring carrier and the bearings at this point. I was finally able to take a gear puller and extract the ring carrier, but had to cut the bearings off. Couldn't begin to move those. The toaster oven is for heatin gthe bearings and the carrier to put them back on.

 

 Here is the problem that caused the extraction. The bearing cone looked just as bad.

 

 New carrier and bearing back on the shaft. Both bearings where replaced, both ends, plus new races.

 

Shaft back in and the case halves back together. This is where you start shimming the front bearings for preload to set the end play on the shafts. Not a bad process, but it is time consuming. Yoke is slipped on the input shaft so I could turn the tranny shafts at each step. 

 

 Here it is ready to go back in the tractor, or close to it. Had to get it stood back up, the rear tranny pump, and the rear yoke put back on. This is where I quite saturday evening. Sorry, no pics of putting it back in, as Sunday morning was just a bit of a hassle, so the camera ended up staying in the truck.

 

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