How to Tell Where the Pinch Point Is Case Ih

schwinnj

Posted 6/24/2017 13:12 (#6087761) Subject: IH Rotor Pinch Point Adjustment?

Northwest Ohio

Have a 1990 Case IH 1660, specialty rotor, Kile front, stock Case IH bars (although pretty new).
Bought the machine used, but have never adjusted pinch point since I've had it.
Never been as happy with it in wheat, than in corn or soybeans.
Searched on here for pinch point, and found a lot of good info. Also found the Harvest Services bulletin about how to adjust ... so I think I've got a handle on what I need to do.

I guess my question is, it sounds like typically they want the contact point to be in the 6th or 7th bar area. Is this desired pinch point location the same for all crops ... or is there ever a reason I'd want it different than that?
Plan on opening it up tomorrow and take a look to see where it's at ... kind of hope it's a ways off, if not, will try to adjust to get pinch point around bar 6 or 7 like the paper says.

Thanks in advance for any replies.

johnny skeptical

Posted 6/24/2017 13:30 (#6087783 - in reply to #6087761) Subject: RE: IH Rotor Pinch Point Adjustment?

n.c.iowa

get your pinch point adjusted, then adjust your concave to rotor minimum clearance stop, then we like to adjust the rear of the concave about 5/16- 3/8'' tighter than the front.

farmwithjunkrrv

Posted 6/24/2017 14:46 (#6087887 - in reply to #6087783) Subject: RE: IH Rotor Pinch Point Adjustment?

South west of Winnipeg MB

If you are having trouble with unthreshed heads in tank I find that is more often a bottom sieve problem. To do a proper check you need to pull the top sieve see if it is all closing and for missing fins. Our old 1480s are all wore out and we have dockage of 1 percent most of the time. If your return is plugging you will need to put some washers under the spring on the slip clutch common thing to do around here. thefarmers

Posted 6/24/2017 14:46 (#6087888 - in reply to #6087761) Subject: RE: IH Rotor Pinch Point Adjustment?

We had a 2166, and like you, were never happy with it in wheat. We adjusted ours over so I was thinking it was the 11th bar, (I think) and thought it did help a little. I was thinking the book told which way to go for certain reasons. Our theory was to move the concave so it was more centered on the rotor, so the gap was more even around, not as wide on the right side when the concave is closed tight. School Of Hard Knock

Posted 6/24/2017 18:42 (#6088157 - in reply to #6087761) Subject: RE: IH Rotor Pinch Point Adjustment?

just a tish NE of central ND

There are a lot of factors here that can affect your samples.Small wire concaves installed? Cover plates on the first 3 sections of concave openings. Rotor speed up to maximum?Seives on bottom closed tight enough to screen heads our of the sample? Tough threshing wheat like Glen spring whheat?
schwinnj

Posted 6/24/2017 19:52 (#6088262 - in reply to #6088157) Subject: RE: IH Rotor Pinch Point Adjustment?

Northwest Ohio

Running cover plates over the first 3 sections, with large wire concaves the rest of the way. Keystock grates in the back, vanes retarded to full slow over both threshing and separating areas.

With respect to rotor speeds ... I've heard different people say different things.
Heard people say more RPM's to thresh with more centrifugal force to get the grain out of the head ... but I've also heard people say that less RPM is better as too much RPM augers it out the back too quickly before it can separate?

Just seems like it's a very fine line between closing the bottom sieve tight enough to get all heads out of the bin .... and closing too tight and overloading (plugging) tailings elevator.

School Of Hard Knock

Posted 6/25/2017 15:54 (#6089532 - in reply to #6088262) Subject: RE: IH Rotor Pinch Point Adjustment?

just a tish NE of central ND

http://partstore.caseih.com/us/parts-search.html#epc::mr49712ar8074...
You arent by chance missing part number 30 are you?? from inside your combine? Its flimsey tin and it if it is missing there will be whitcaps you can NOT explain in the sample of wheat. Check parts dept to see if you have one required and look into combine rear to see if it is there or not. Mine was missing and it took years to figure out where the white caps were coming from in the sample.
Higher the rpms, the more threshing of hard heads it will do.

Edited by School Of Hard Knock 6/25/2017 15:55

thefarmers

Posted 6/25/2017 18:58 (#6089792 - in reply to #6088262) Subject: RE: IH Rotor Pinch Point Adjustment?

We never had any luck running key stock grates in wheat. We always ran all small wire concaves and slotted grates, but we usually didn't run covers. We thought it put way to much chaff over the chaffer instead of out the back of the rotor, which makes too much to separate. Also if the heads have wheat in them it will help with that. If the heads don't have wheat in them, you can close the chaffer a little so the sieve doesn't have to do all the separating. We also had Gordon bars on ours, and we always thought they worked a lot better than the case ifph specialty rotor bars. schwinnj

Posted 6/25/2017 20:24 (#6089964 - in reply to #6089532) Subject: RE: IH Rotor Pinch Point Adjustment?

Northwest Ohio

Spent about 5 hours on it today and I'm 95% sure I have tin number 30, but will look for sure again tomorrow.

Was in there today and checked pinch point ... came out to around the 6th or 7th bar down ladder side of the machine, which is where it seemed like it was supposed to from what I've read. So I didn't mess any with the left to right placement of concaves.

I did notice something else though. When I tighten my ratchet all the way up, I can't get the concaves tight enough to make the rotor "tick". Even when I loosen the two stop bolts on LH side of the machine (which I assume were supposed to keep the concaves from being adjusted up far enough to get into the rotor), I can't lift the left side high enough to make it tick. I've always heard people say you want to be able to make it tick then back it off a ratchet or two ... and I can't make it tick to begin with. I think what's happening, is that the threaded casting which moves from left to right as the threaded rod turns from the ratchet ... the corner of that casting bottoms out on the inside of my square sheet metal cutout (I can see where the casting is actually forcing the sheet metal outward, due to the ratchet cranking so hard). I took a mirror up in there today and I know I've still got a few threads left on the rod (so I'm not running out of threads) and the threads are clean ... but the sheet metal won't let the movable threaded casting move outward any further.

I think what I'm going to try tomorrow, is make a new vertical strap that hooks to the front-to-back rod on the left side which rotates and connects to the threaded adjustment bolt at rear of concaves (strap right behind the numbered pointer arm which indicates relative adjustment height), with hole to hole distance on this vertical strap reduced by 1/2" (currently at 5.5 inches center to center, want to reduce to 5.0 inches). If I can reduce the back right hanger strap by 1/2 inch, then I've got enough threads on front left bolt to jack the front left corner up by 1/2 inch as well. This should let me raise the left side of the concaves further up before the moveable threaded casting runs into the inside of the sheet metal Then I'll see if I can raise it high enough to make it tick.

schwinnj

Posted 6/25/2017 20:26 (#6089969 - in reply to #6089792) Subject: RE: IH Rotor Pinch Point Adjustment?

Northwest Ohio

I was considering Gorden bars over the front couple of segments as a next step.
Trying to avoid changing grates, if I can help it. School Of Hard Knock

Posted 6/28/2017 20:48 (#6095175 - in reply to #6089964) Subject: RE: IH Rotor Pinch Point Adjustment?

just a tish NE of central ND

You have to get the rotor tight enough where it can tick and just back it up so it clears otherwise unthreshed kernels will pass-through

How to Tell Where the Pinch Point Is Case Ih

Source: https://talk.newagtalk.com/forums/thread-view.asp?tid=715078&DisplayType=flat&setCookie=1

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