Case Ih 1688 Combine Manual
Crop types and conditions will determine the ideal concave and threshing setup—a crucial factor in optimal crop. Our Case-IH 1688 Axial Flow Combine Service Manual is a high-quality reproduction of factory manuals from the OEM (Original Equipment Manufacturer).
When my dad bought his 1688 4 years ago, it came with a 1680 manual, and although it is uselful for most of the combine, there are a few things that we would still like to have the proper information for. One of the biggest things is the factory engine speed. The guy that dad bought the combine from had it sped up to almost 2800 rpm and from what I can find after hours of google searches is that the 1688's were turned down to 2200 rpm. We did turn it down to 2300 but seems like we loose too much rotor and fan speed (rotor maxes out at 940 and fan at 950 when running 2300engine rpm). So we need to find out if something else has been changed (eg. Slow down kit).
If anyone has a manual they would like to sell or possibly give some elaboration on how these machines were set up as apposed to a 1680 would be tons of help. Thank you in advance! This sounds a lot like a 1680 not a 1688. I wonder if the engine and the top end separator drive aren't from a 1680. Did someone put in a cross flow fan?
The 1680 didn't come with that. Does it have a gearbox on the unloading auger vertical auger or is it helical open gears?
Case 1688 Combine For Sale
Does the valve spool box next to cab have a hinge or is it bolt down? Are the hydraulic valves inside the box mounted vertically or horizontally? If stacked one on top of the other it is a 1680. 1688 has them mounted horizontally. What does the serial number on the LH side of the combine tell you?
I would suspect if you have a 1680 manual and the machine has been setup to run the Cummins engine at greater than 2300 - it is a 1680 and not a 1688. The only thing I can think of is that it maybe one of the first few models of 1688 which may not have had the changes but I really doubt that they would have placed a new model out with old materials. The radiator is and the air cleaner is way bigger on the 1688. The 1680 had the same air cleaner as a 1460 - way too small for that much HP! Its definitely a 1994 1688, I think what happened was the people dad bought it from were trying to spin the rotor as fast as possible, when we got it home we realized that the rotor transmission was cranked all the way to the left, thinking that they would pull the belt tighter and spin faster, the concaves were way out of adjustment (1/2 inch on pipe side and rub bars would hit somewhere in the center of the concave) And then the engine speed was cranked up way to much.
Its been so frustrating trying to get a clean sample out of this machine without either filling the hopper with white caps or throwing out massive amounts. The old worn out 1480 would be almost clean enough to put right into the air drill without cleaning and would never throw over.
It was last fall that we changed the engine rpm, so how we did it escapes me at the moment, I'm sure it was just tightening/loosening the retaining nuts on the cable at the throttle on the pump, and it didn't make the lever in the cab any tighter when at full throttle. RunningREDharD, is your rotor maxed out at 950? Or will it spin faster? We may need a new fan belt to get the rpm up to 1200, but we rebuilt the entire rotor drive last summer and put a new belt on but still can't get over 1000 rotor rpm with the engine at 2200. But then again if the sheive measurements and settings are different between 1680 and 1688 then that could be part of the issue.
Which would lead me back to needing the proper manual or I may as well just have a john deere 9600 manual to go. Thanks a lot for the help guys, I really appreciate it, its a darn good machine if we could just get it to run properly.
You are logged in as a guest. ( ) 1688 combine Jump to page: Now viewing page 1 50 messages per page:: - Message format Posted 5/25/2017 08:34 (#6036795) Subject: 1688 combine southern Illinois Got a new to me 1688. Wanting to get familiar with it because go to some wheat to cut in couple weeks or so. I was needing a little help setting it for wheat. I didn't receive a owners manual with it. Does anybody know the setting to use for concave. Fan and so forth.
I got tired of waiting on my neighbor to harvest my crops so I bought this 1688. Haven't messed with a combine since the early 80's and it was a 815. So any help would be appreciated. Any tips or tricks. Or them NO-NO's. Posted 5/25/2017 08:44 (#6036821 - in reply to #6036795) Subject: RE: 1688 combine I would suggest you go to your case ih dealer and get the operators manual. Posted 5/25/2017 09:35 (#6036893 - in reply to #6036795) Subject: RE: 1688 combine W IL Yeah i would suggest just getting an operators manual.
I know some setting I have found online but you will want the manual regardless. If dealer is out of line on their price here is one i found online just doing a quick search. Might be others out there as well. Posted 5/25/2017 09:39 (#6036904 - in reply to #6036795) Subject: RE: 1688 combine WC MN & VoTS, AZ $102.18 from the CASE-IH manual website Enter the following on the left to search Model 1688 Type Operator's Manual Language English Region NAFTA Product Line Harvesting Equipment Edited by Schuerman Farms 5/25/2017 09:39 Posted 5/25/2017 09:59 (#6036957 - in reply to #6036795) Subject: RE: 1688 combine Central KY I found a guy thru the Red Power forum that I bought service manuals for a Case IH tractor and combine from, very reasonable. Feel free to email me for his contact info. Never met him, but have been very happy with what he has sent me. He might be able to help you out.
Posted 5/25/2017 10:52 (#6037059 - in reply to #6036795) Subject: RE: 1688 combine Grand Island, Nebraska This is off of the CaseIH Productivy Guide. (Settings 1.jpg) Attachments - (170KB - 24 downloads) (166KB - 26 downloads) Posted 5/25/2017 12:06 (#6037176 - in reply to #6036795) Subject: RE: 1688 combine wc mn I may have an owners manual for you, and a parts book even! Posted 5/25/2017 12:33 (#6037233 - in reply to #6036795) Subject: RE: 1688 combine Operators, parts and service manuals can be had from CIH if you don't mind paying too much. Otherwise, they seem to be widely available as reproduction print or CD versions. There's always of course ebay where used manuals are usually available fairly cheap.
A used but clean 1688 operators manual should be had for $25. You really need to get at least the operators and parts manuals. Otherwise, for wheat harvest. Concave - 1/2. Westwood mower service manual. LW, SW, SW or SW, SW, SW concaves. Slotted grates. Rotor speed - 850 rpms.
Fan - 1100rpms. Chaffer - 3/8, 1/2, 1/2. Set the sieves by closing all the way shut then opening to the desired gap. Sieve gauges (plastic and metal ) have been available but I don't know where to get them anymore. A tape measure is okay. Your mileage may vary.; ) CIH used to have a plastic sieve gauge but the thin end always breaks off. Deere had a nice metal gauge but the part number seems to be no good anymore.
I always tried to use a gauge to not necessarily set sieves at a particular value, but more to return them to exactly where they'd been if you had to open them up for some reason. Edited by biscuit 5/25/2017 18:31. (5-25-2017 2-25-04 PM.jpg) Attachments - (93KB - 28 downloads) Posted 5/25/2017 12:42 (#6037252 - in reply to #6036795) Subject: RE: 1688 combine NC IA Don't know why everyone is avoiding the question- Start here- Standard rotor 900, speciality rotor 950+. Small wire concaves, set on 1. (after zeroed out and check position of indicator in relationship to the number scale. ) very front portion of chaffer nearly closed, play with main chaffer section and shoe.
(ideal to have short-finger small-grain chaffer & shoe sieves. ) Fan speed 1120+ Don't know if you have a rock trap or not, but if you do make sure it has the serratted bars on the rock trap beater. But yes I agree get an owners maunal. Posted 5/25/2017 18:49 (#6037780 - in reply to #6036821) Subject: RE: 1688 combine northern ohio lake erie We found some books at a tractor show/ flea market Posted 5/25/2017 20:40 (#6038026 - in reply to #6037252) Subject: RE: 1688 combine southern Illinois Thanks for all the replys I will get a owners manual from where u guys suggested. And thanks Jalopy. For the preliminary settings.
And no it does not have a rock trap Posted 5/25/2017 21:13 (#6038113 - in reply to #6036795) Subject: RE: 1688 combine just a tish NE of central ND Squeeze rotor unt8ill ti 'ticks' while running and back ti off untill its gets quiet. Fan 900 rpms+ so that you clean with a LOT of air to lift the chaff all up off of the sieves so it floats out the back instead of riding off the rear of the sieve with t he wheat on top of it.Chaffer open so unthreshed heads drop through and, 'open pretty far'Bottom sieve open so threshed wheat easily falls through and unthreashed chunks have to drift into the return auger in back, and fine tune it from there., Posted 5/26/2017 08:17 (#6038743 - in reply to #6036795) Subject: RE: 1688 combine Central New York.
Case Ih 1688 Combine Problems
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