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656 v.s. 706

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John

11-30-2003 14:46:37

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what is the differences between a 656 and 706? i know the trannies are different, but what about the engines? i know there similar in horsepower but what cubic inch are they (gas)? any info will be appreciated

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wolfy

11-30-2003 18:32:51

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Re: 656 v.s. 706 in reply to John, 11-30-2003 14:46:37

The 656 gas has the 263 cu in but only revs to 1800 rpm; tests at 63.85 hp (Nebraska test). At only 1800 rpm & 263 cubes, it is quite economical for rather powerful gaser. The early 706 gas had the 263 revved up to 2300 rpm.About 73.82 hp. The 706 had much heavier rear end & axle carriers,etc; 16 speeds vs. 10 in the 656. Nebraska test on 706G said 10.45 hp hr/gal which is actually amazing. A 3020 Diesel only tested at 10.61 hp hr/gal! The later 706 gas & the 756 gas had the 291 cu in & were a bit thirstier. Probably at least 1500 lbs difference in weight. 6500ish vs 8200ish.

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todd hamilton

11-30-2003 17:56:23

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Re: 656 v.s. 706 in reply to John, 11-30-2003 14:46:37

Greetings from the Case board. I have an SC like the one Dad had when I was a kid. However, in the extended family were 2 gas 706s, 1 gas 656 standard 5 speed, and 1 gas 656 hydrostatic. The hydro wouldn't pull the hat off of your head so it does not count in this discussion. It was handy for three things; hay baler, corn planter, cultivating. Grandpa's standard 656 pulled a 4 16s plow and is still in use by my cousin to this day. Uncle Mike's 706 pulled a 5 14s plow and required an engine overhaul every 2 or 3 years. I spent many hours operating both and my ex-brother-in-law also had a 706. To get more horsepower in the 706s the engine RPM for PTO was 2150 compared to the 656 at 1850. A 706 will outrun and outpull a 656 due to the higher RPM, 8 speed transmission, and heavier weight. However, they did wear the engines much faster due to the higher RPM. Our family also ran the corn picker on Uncle Mike's 706 which ran the hours up on the tractor at high RPM. So for performance the 706 is better and for reliabilty the 656 is better.

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Hugh MacKay

11-30-2003 16:06:47

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Re: 656 v.s. 706 in reply to John, 11-30-2003 14:46:37

John: I did a large percentage of my farming with a 656 diesel and its older cousin a 560 diesel. Both these tractors had the 282 diesel engine with 5 speed and TA. Absolutly the most economical horse power I ever had on farm. They were virtually trouble free tractors. 656 went over 10,000 hours to its first major rebuild. At that time I did tractor from end to end. Every thing including TA and pto were still working at that time. I had the dealer redo the complete tractor.

The 560 blew up at 11,000 hours, it had pistons and sleeves at 7,000 hours. I had run that tractor at 90 hp since new. It saw a lot of hard work it was never designed for. PTO clutch pack every two years. In the end it distributed engine parts across the barn yard.

I have operated a few 706's some. To me they always seemed as though that chassis was just a bit to much, for the 282 engine. Then you have to realize what I was used to. The fact that IH put 310 german in later 706's and my experience with 560, I would say no to a 706 with 282.

I will say no to all of them in gasoline models.

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12-01-2003 19:07:32

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Re: Re: 656 v.s. 706 in reply to Hugh MacKay, 11-30-2003 16:06:47

how did you get 90 hp out of your 560?? did U turbo it?? Mine has only pulled 58 to 62 when on the dyno

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Hugh MacKay

12-02-2003 02:53:05

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Re: Re: Re: 656 v.s. 706 in reply to hr, 12-01-2003 19:07:32

John: An IH technician did this for me. Basically he moved the 282 pump to 706 or 660 specs and rpm. Then he did the rest with pump settings. I am not up on the terminology and don't know exactly what he did. The other thing you must remember this tractor was new. During the 50s, 60s and 70s it was very common for a new Farmall to exceed its rated hp by as much as 20% Out of 9 new Farmalls that came to our farm during that period, only one never exceeded it's rated hp. Only one of them was 20% over as well, and it came from factory that way. The 560 is the only one I ever tampered with. Extra hp was needed, and at the time it had to come economically. My 560 was a 63 so transmission problems had been corrected by then. To me pto was the weak link, I rebuilt that every 2 years until I bought new 1066 in 1975.

I wouldn't recomend doing this to an old tractor. My 560 was around for 11,000 hours in 17 years, and was basically a scrapyard special by then. The engine blew up at that time and I couldn't see spending $5,000. on a tractor without a modern draft controlled 3 point hitch. I know the dealer had a used 766 with roughly 3,000 hours. I didn't buy it but as I recall it was under $10,000.

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Jimmy King

11-30-2003 15:09:19

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Re: 656 v.s. 706 in reply to John, 11-30-2003 14:46:37

My hotline book shows 656 gas with a 263cid 63hp and a 706 gas 291cid 76hp. now I don't know any thing about a gas but in Diesel a 656 has a 282 cid 62 hp and a 706 D the early ones had a 282 cid 70 hp higher RPM the later ones had a German 310 cid 76 hp.

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CNKS

11-30-2003 14:58:50

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Re: 656 v.s. 706 in reply to John, 11-30-2003 14:46:37

706 was built from 63-67, Gas engine, 263 cid, LP, 291 cid, diesel 282 followed by 310 cid. 656 was built from 1965-1973: 263 cid gas and LP, 282 diesel. Figures taken from Ken Updikes ID Guide. 706 was rated at about 10 more hp than the 656 and was 1200 lbs heavier--never driven either, someone else can fill in the details.

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RDC

11-30-2003 16:46:56

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Re: Re: 656 v.s. 706 in reply to CNKS, 11-30-2003 14:58:50

All 656 gas tractors used the C-263, all diesels used the D-282. Early 706 gas used the C-263 and later ones used the C-291. Early diesels used the D-282 and later ones used the German D-310. While the early 706' shared the same engines as the 656, the 706 was rated for more HP. I have an early 706 with the D-282 and I think the added weight of the 706 makes it seem underpowered when compared to the 656. Don't get me wrong, it's a good running engine but the German D-310 would be better. I've run both models with gas engines and I don't think I could afford to feed them long, the diesels are much more economical. My 2 cents.

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