Go Bottomwater in transmission case
 | alan genung
Join Date: Posts: 1 
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2002-01-05 34307
I have a Yanmar 135d compact tractor and I am having continous problems with moisture in transmission case and is always clogging up the filter restricting fluid to the pump. I have flushed out the system several times and still having this proble. Has anybody had this problem and if so, where is the moisture coming from and how to keep the contamination down to a minimum.
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2002-01-06 34317
I wonder how the oil appears after a period of operation--milky, frothy? I can't make a direct connection between water in the oil and clogged filters, but maybe somebody else can.
Some moisture does get into oil from condensation inside the cases, but it tends to evaporate when oil is hot during use. Some people do get into the cases around the axle seals sometimes, but they're usually making stream crossings and standing axle deep in water. I suppose something like an unused oil return port plug could be off, but missing covers, plugs etc. should result in some leaking on the ground.
I guess there a fair number of possibilities that could be labeled exotic problems, but maybe somebody will come up with a likely explanation.
....
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| jd110_1963
Join Date: Feb 2002 Posts: 87 westminster, md
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2002-01-06 34325
Alan, I'm not familiar with your model, but a common place for water to enter the system is around a cracked, torn or missing shift lever boot. If that is not the case, I would check any gaskets on top of the transmission. If there are any signs of oil leaks around the shift cover or rockshaft gaskets, water could seep in where the oil seeps out. Also, it is very difficult to get all of the water out of the system the first time due to all of the oil in the pumps, oil lines, valves, and if you have a loader, all of the cylinders are full of contaminated oil also. I usually try to disconnect the hydraulic lines at the cylinders and remove the pin on one end of the cylinder so you can push the cylinder in and out by hand to get rid of as much contamination as possible. Kenny ....
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2002-01-06 34331
Alan, does this tractor live outside or in a wet climate? If so, I'll echo what jd110 says, because the problem with water entering around the shifter boot on that particular tractor is a known and documented problem. Yanmar even sent out service bulletins about it before they re-designed the shifter boot. Another place that rain water can cause trouble on those is by seeping down the steering column where it sits on top of the steering box seal. After enough years pass, some of the water can work its way into the steering box and cause trouble. Some people have had water make its way past the combo fuel cap and gauge. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2002-01-07 34334
I figured that a likely explanation would come up. I don't know about the Yanmar, but there may be several boots to check. My Ford has a rubber boot around the shift levers where they go into the TX top-plate. There also is a boot on top the a cover housing for the range lever. This boot is the one seen, but it seems more like a dust cover. The boots under the housing certainly would admit water if they were cracked.
I still wonder if just having water in the oil would clog filters, or if something else is going on. You'd think that after several flushings, most 'gunk' would be cleaned out unless the TX had a lot of stuff in it. ....
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