It's been a while since I've had the time to sit down and post some pictures, but since I snapped a few recently I thought I would share a little "Show and Tell." As Gerry Ide has pointed out, a lot of those who follow the forum are new to Cubbin' and may not realize what is involved in changing the fluid in their hydrostatic transmission. I remember the time I asked the local dealer where the drain plug was, so we all have to start somewhere!
Here I am, optimistically ready to begin my oil and filter change on my 149 S/N 2050047U464260 which I think was manufactured in 1974. I thought to myself, what is so complicated about popping off 7 bolts and changing a filter --right?
Well, to begin with, one bolt (on the bottom left in the picture) required the use of 3 foot cheater bar to break loose ??!!
Anyway, I got the oil flowing pretty quickly, I seem to remember getting out a dead blow hammer and striking the end plate on the end a few times
Note: I don't think this fluid is actually HyTran. The former owner was big on front end loaders and I suspect he used a generic hydraulic fluid. There are no gelatinous clumps of water-retaining fluid inside the housing as would be expected when filled with IH HyTran and left outside in the elements of coastal Carolina for ten years as this tractor was.
The new filter was not the same color as the old one, although it is difficult to tell in the view from the top:
It can be seen better from below (I think).
I finally managed to get the old filter off after breaking my favorite oil filter wrench and trying several tools and combinations to try to break it loose. Part of the problem was that ground interfered with my use of decent-sized levers (1/2" ratchet). I found the chain wrench to be the most effective tool, although it tended to get trapped behind the flex disk on the drive shaft above the filter.
Note that the close nipple came off with the filter instead of remaining on the transmission. I didn't discover this until I tried to attach the new filter. Although the Defense of Marriage Act has been knocked down by the Supreme Court, female oil filters still need male nipples to form an attachment for life.
A closer look at the tools I used to remove the oil filter:
The filter had already been deformed somehow before I started, so the end-cap style wouldn't work, the black strap wrench was too small to go around the existing filter, the rubber strap wrench was totally ineffective (as always), the "spider ratchet" (my favorite) broke before the filter let loose its grip on the transmission housing, and only the chain wrench made the grade. I think I picked it up at an auto parts store for less than $10.
The hardest part of the job turned out to be the removal of the old gasket.
My son, who is a Machinist Mate in the Navy (2nd Class), tells me that the gasket is made of a material known as Garlock, and it is famous for its sealing ability. I've encountered it before, and it always gives me fits. It seems that every last iota of the gasket has to be laboriously removed from the surface of BOTH the end plate and the housing. My old compressor is on the fritz, and I don't yet have the new one installed, or I would have gotten out the die grinder and the Scotch-Brite pads (which work wonderfully). As it was, I was reduced to scraping with every tool available. Whatever tool I start with, however, I always seem to wind up with a jack knife in my hand.
The new gasket and end plate prepared for installation:
I procured the gasket from a local IH dealer, but it seems strange to see "Fiat Group" printed on the packaging.
The tools I used to remove the gasket:
The fairly blunt "Gasket Removal Tool" was totally ineffectual in removing the Garlock gasket. The old plane blade wasn't sharp enough to get it all either, and even the knife struggled, but I think I got down to the metal on all the places that matter.
I put grease on both sides of the gasket before installing it and tightened all bolts to an arbitrarily chosen 25 ft-lbs. (My fingers were too dirty to access the manual, it rained the entire time I spent removing the gasket from the end plate, and it was threatening to rain again. I was running late for work (insert latest excuse here).
I purchased two gallons of HyTran from the dealer, and I tried to pour all but 1/2 a gallon into the transmission. But I lost a good bit fluid when it started pouring back out the drain hole after I removed the funnel and hose combination (not shown). So, if I were to do it over, I would pour in a gallon and start the tractor before topping off (which I have yet to do).
When I started the tractor and backed it into the shed, it seemed to have a lot more "pep" and shifted quite quickly into forward and reverse. I think that the new, genuine HyTran may have helped the performance of my tractor.