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Combine differences

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Looking into buying a combine what are the differences between a 1680 and 1688 besides the age?  1688's seem to bring quite abut more money then the 1680s

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     Early 1680's had IH 466 engine from 1986 to 1990?, then they got the CDC 8.3.  The high RPM's that the IH engine had no problem running at, gave the Cummins 8.3 some problems so they they changed the gearing in the PTO box to lower the operating RPM's  of the Cummins in the 1688 models. The 1688 also had the 12" longer chaffer and shoe and the fan changed from the paddle fan to the squirrel cage fan to increase airflow for the longer chaffer and shoe. That's the main changes that I can think of.

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most 1680's came with beaters in the back the 1688 the chopper came standard on most of them anyways I've never seen one with a beater have seen 2188's with beaters though

 

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Have run both.  The 1688 has a better engine.  More power at a lower RPM 2400 rated vs 2600.   That is the main difference between  a late 1680 and 88.  Go for the 1688 if you can find one.

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The 1680 with big numbers on the side will have IH engine and short shoe.

1680 with small numbers on side will have 8.3 cummins and long shoe.

Other then small electronic changes a late 1680 with an 8.3 cummins is virtually the same as a 1688.

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4 hours ago, Cliff Neubauer said:

Didn't the 88s get a closed center hydraulic system or did that not come out till the 2100s?

Yes they did even in 92 the last few 1680s even did to I know I had one 

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Closed center hydraulics were not installed on Axial-Flows until the 2100 series. Now, the 1992 1680s(and 1688s) had a different hydraulic system than the 1991 and prior 1680s which was more or less the same system that IH came out with in 1981. The late 1680/1688 hydraulics had a bigger hydraulic pump and the valve stack was turned sideways-also the header valve had an adjustable raise rate screw in addition to the adjustable lower rate that the older EOH systems had.

We were told that the reason the 2188s had the same engine HP as the 1688s because it was felt in testing that the closed-center hydraulic system used 15hp less than the open-center system-so the 2188 would seem to have more HP to the operator than the 1688.

As far as values, 1688s have always enjoyed a pretty high resale value among Axial-Flows. Some of the reasons have been mentioned here as far as improvements over the 1680s(more HP, slower engine RPM, cross-flow fan, HD long sieve drives that came out on 1992 1680s). One big reason is that they were only built for 2 years-1993 and 94. I can also remember back in the late 1990s/early 2000s 1688s had higher values than early 2188s-the early 2188s had a lot of problems and not all farmers wanted to deal with all the electronics on the 21xxs and newer.

Also, there were some early 1680s with Cummins engines that still had the short sieves. I've got 2 of them around here.

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