I can tell you that with my 2606, the standpipe in the rear of the draft control housing is welded to a plate that is bolted up from the bottom of the gear box. The only way it will come out is with a hack/reciprocating saw.
I found my housing had about an inch of sludge in the bottom that I cleaned out. Since mine doesn't have the draft control, there was a 3" long hex bullplug in the left front corner. It is a 1/4" plug and I took it out. It allows oil to drain down but slowly. I took the plate off again when I was still having hydraulic problems to see if the the relief valve was bypassing again. I noticed it flowed so much hydraulic oil that it still filled up the cavity to the top of the standpipe because it wouldn't flow down the 1/4" hole fast enough. Since it was just filling up while running I decided not to cut the pipe off and risk getting metal filings in the oil. When I scooped it out the first time, I estimate it held about 1 1/2 gals. of hytran.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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