109 redo
 

Well the "86" is done for the most part, except for a few minor details. I would like to put a 36" snwblower on her for this winter, but Mama said "finish what's on your plate and then you can have dessert". Sooooo, I hauled the 109 up onto the bench and began dis-assembly. Since it was going uphill anyway, I decided to drain the tranny. Engine breakdown went smooth until I saw this under the breather cover. I've never seen this on any Kohler I've taken apart, maybe on an old Techumseh. I'm not sure if this was caused by wear or from something else. It's on the exhaust side which means what again? With all the weeds and crud I took out of the inside framework, I was expecting to find some sort of critter home. Oh well, keep moving forward. I found what looks like crystallized sludge in the differential. This is a hydro unit. Do I need to flush the whole system, or is breakdown and wash a better solution. Hydro's are new to me so any info would be helpful. I've already read the manual, but it doesn't say anything about flushing or cleaning. just breakdown and rebuild. Also found a tag w/ these #'s, (top row) 69186C91, (middle row) 90-1074, (bottom row) 02-NA 4732P. I'm assuming these are model and serial but what do they mean? Where can I look these up for reference? as long as this Indian summer keeps up, I'll be you know where. more pics after the battery recharges on the camera.

Those numbers sound like casting numbers. The tractor's serial number is on a tag either on back of the rearend or on the left side of the frame by the brake pedal. Drain the rear, wipe out any gunk, clean it with brake cleaner, and then put it all back together and refill. If you have it apart that far I would pull the axles out and put new axle seals in it.

That buildup on the exhaust valve spring is probably due to a worn valve guide. Exhaust gases get blown through the space between the valve stem and guide and cook the oil on the valve stem and spring, causing that buildup.

thanks for responding matt. i thought that might be the problem with the dirty valve spring. the #'s i posted were on a tag located on the front of the hydro unit itself. oh, and by the way, how many hour hands are on your clocks? it's amazing the amount of time you have. can i borrow some of your energy? i read the article on hy-trans fluid a bunch of thrds back, it had the inventor of the fluid, mr. hoch? do you study hydro engineering as well?

Oh...now I know which tag you are talking about. That's the one on the hydro unit itself. I don't know of anyone ever trying to decode everything on there.

I don't get a lot of sleep during the school year:Work:

No hydro engineering...however, I can apply stuff I've learned to more than what is dealt with in class.

69186C91 = IH Part Number
90-1074 = Sundstrand Part Number
02-NA 4732P = Sundstrand Serial Number

Thank you Roland, I have a feeling I'll be taking this apart to clean out the gunk. upon closer inspection i have found excessive where patterns on the differential gear teeth and suspect I'll find something wrong in the hydro unit. pics to follow.

Got a picture of this 'excessive wear'? I find that kind of hard to believe...most of these things get abused pretty bad, but I've never actually heard of a worn-out ring and pinion on one.

i tore open the hydro pump and from what i have read up on this looks to be normal.does this really need a bath before reassembly? these pics are of the diff. gears that i thought may have wear. i'm not sure if you can see clearly on the friction sides of the teeth, the uneven wear markings. also in the last photo, does this crud need to be flushed out of the pump? if so how?

That looks like pretty normal wear to me. Unless there are perceptible grooves or broken teeth, it's fine. You aren't going to open up the rear on a 40-year-old tractor and find no wear. The gunk needs to go. Start with rags and mineral spirits, and then finish with brake cleaner. Try not to get the brake cleaner in bearings and stuff if possible.

thanks matt for responding so quick. i shall do just that with the cleanout and then see if i remember where all the bolts go.