IH B275 controls

I have not been able to determine the purpose of these two knobs. I didn't want to try them and do something wrong.
One is oblong roughly diamond shaped right behind the shift. The other is the big knurled knob under the operators right leg. It has a word on it and an arrow.
Anybody care to set me straight on the purpose of these two knobs?
Thanks.
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Well, it's been a while, and I don't have the manual in front of me, but I'll give it a try. Big knob by operator's right leg is a stop which limits how far the hitch arms can drop. When viewed from the front looking rearward, it says "DEEPER", with an arrow pointing clockwise. Primarily used to set depth on a mounted plow. Diamond-shaped knob controls how fast hitch arms drop when control lever is pushed fully down. Think I'm close. Good luck with that nice little tractor, which will pull the butt off that 8n if it's weighted correctly.
 
What Mr. Smitholm said is pretty much right-on. Big knob is drop-depth setting for the three-point hitch. It is how I keep my rear snowblower, tiller, brushcutter or plows at the depth I want-(I have two B275s). The little T-handle locks the three-point. One of my B275s has a front-end loader that runs off the same pump as the three-point hitch. If I want the loader to work, and the three-point to stay still - I have to turn the T-handle in and then use the three-point control lever to make my loader go up and down.
 
Thanks for the replies. I just got the B275 and I really like the power. I even bought some implements for it. Hopefully I'll get to work it a little bit.
 
Might I suggest a very prudent investment of approximately $30?

http://www.yesterdaystractors.com/IHOB275GD_7926.htm

The information contained within this book is invaluable to the operation and maintenance of your new tractor, and it would tell you what the knobs do, and how to use them.
 

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