7000 Series Tach Swap?

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   Maybe I just have too much free thinking time on my hands this winter, but I’m wondering if a 100 series tractor with an  alternator driven mechanical tachometer would swap into place on a 7000 series, if the gauge was swapped as well? I know that is going backwards in technology, but the mechanical aspect seems nice, and does away with electrical issues. 

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CrestonM Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Sep 2014 Location: Oklahoma Points: 8459	Post Options Post Reply Quote CrestonM Report Post Thanks(0) Quote Reply Topic: 7000 Series Tach Swap? Posted: 08 Feb 2022 at 8:22pm
	Maybe I just have too much free thinking time on my hands this winter, but I’m wondering if a 100 series tractor with an alternator driven mechanical tachometer would swap into place on a 7000 series, if the gauge was swapped as well? I know that is going backwards in technology, but the mechanical aspect seems nice, and does away with electrical issues.

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KJCHRIS Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 21 Dec 2015 Location: WC Iowa Points: 979	Post Options Post Reply Quote KJCHRIS Report Post Thanks(0) Quote Reply Posted: 08 Feb 2022 at 8:41pm
	Creston, you'd need to find what RPM the Alternator turns at several different engine RPMs. Like Low Idle, 1200 and Hi Idle as example. Then install DN alt and start to find its RPM at same Eng RPM, then change alt pulley diam to adjust. I think it'll get complicated. Plus the Delco DN alternator w/tach drive is only 32Amp & 54Amp, and I think your cab accessories ie., A C in cab, stereo system, and Stadium lights will want more power.
	AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,

shameless dude Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 10 Apr 2017 Location: east NE Points: 13607	Post Options Post Reply Quote shameless dude Report Post Thanks(0) Quote Reply Posted: 08 Feb 2022 at 11:20pm
	do you need a tach?

CrestonM Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Sep 2014 Location: Oklahoma Points: 8459	Post Options Post Reply Quote CrestonM Report Post Thanks(0) Quote Reply Posted: 09 Feb 2022 at 10:24am
	That’s a good point about not producing enough amps. Shameless, I guess a seasoned operator doesn’t really “need” one, but being a 7080, I’d like to have one to get an idea of at least where on the throttle quadrant 2,500 RPM is. I’d like to keep it below that. Edited by CrestonM - 09 Feb 2022 at 10:24am

8070nc Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 21 Mar 2019 Location: North Carolina Points: 663	Post Options Post Reply Quote 8070nc Report Post Thanks(0) Quote Reply Posted: 09 Feb 2022 at 10:47am
	If you cant work out the tach thing you could use an optical tach with a piece of reflective tape on the crank pulley. Thats what I did on a generator to get close enough to 1800 rpm to check hertz electrically. If it is a roosa pump it it should be relatively easy to set the high idle stop so you could just push the fuel lever up all the way and not worry about it
	1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor

Adam Stratton Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: SW MO Points: 1363	Post Options Post Reply Quote Adam Stratton Report Post Thanks(0) Quote Reply Posted: 09 Feb 2022 at 9:07pm
	I've been very tempted by the "mini tach" it has a "counter" that clips to injection line. Supposed to track rpm and hours and maybe a few other things. I've got several tractors that the tachs have quit on that I run by ear and feel and always err on the side of caution but might want to do some research that direction

Alvin M Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 24 Jun 2018 Location: PA Points: 815	Post Options Post Reply Quote Alvin M Report Post Thanks(0) Quote Reply Posted: 10 Feb 2022 at 5:06pm
	I use the Isspro R85215 they plug in the alternator you can adjust the rpms on the unit sold 2 today they dont make them any more new #need a sender have few left of the old r85215 left

rw Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 28 Oct 2009 Location: United States Points: 385	Post Options Post Reply Quote rw Report Post Thanks(0) Quote Reply Posted: 12 Feb 2022 at 7:50am
	I want a tach sensor/gauge for my PTO shaft on my 7045. Need it for spreading dry fertilizer.

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 22285	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 12 Feb 2022 at 8:12am
	What PTO speed to you want?? 1,021 RPM PTO is 2,300 engine RPM. 540 PTO speed is 557 RPM at 2,300 engine RPM. These are accurate numbers if your tachometer is accurate.

8070nc Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 21 Mar 2019 Location: North Carolina Points: 663	Post Options Post Reply Quote 8070nc Report Post Thanks(0) Quote Reply Posted: 12 Feb 2022 at 10:17am
	If you want exact pto rpm you can get a tach and magnetic pickup from isspro. They have kits with glue on magnets for the pickup. I know glue on magnets so id get extras. Glue the magnets on the flange of the pto. That way when you change 540 to 1000 or vice versa it will still work. At least thats what id do if i needed it. With that you can mount the tach head in the cab so you can see it. Thats a rough place to put that pickup but i dont know any other place to put it. Just my thoughts
	1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 22285	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 12 Feb 2022 at 10:39am
	Dry fertilizer spinner speed is always better too fast than too slow. Overlap at the ends is pretty thin and evens out with each round. How the product lands on the spinners is very important.

rw Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 28 Oct 2009 Location: United States Points: 385	Post Options Post Reply Quote rw Report Post Thanks(0) Quote Reply Posted: 12 Feb 2022 at 2:57pm
	All exactly right points Dr. You've got me thinking. I think I will get a photo tach and check some things out. Maybe I should fix the belts and pullies to the crank water pump and alternator that I kinda believe are worn because the RPM needle moves up and down 200 to 300 RPM with the air conditioner fan from off to high. That is why I do not trust the tach and wanted measure the rpm on the output. As you said and I agree, I have my doubts about the rented spreader being set right for the rates I select, but that is not really within my control. Knowing and controlling the pto speed within a few seems like something that might be worth a try. The batteries stay up and it doesn't overheat belt doesn't squeal so I was passing on the pulleys and belts. Could be a ground issue possibly. It has a power shift so I can pretty well hold the rpms on the turns and up and down a grade. Had a problem with and got a drone shot of field of oats and fertilizer that I broadcast and it shows up real well that the areas behind the tractor were light judging by the density of the oats and the color of all the plants. Everything in the field emerged and grew that way, The alfalfa and grass went on with a brillion seeder it had lush strips and weak strips 50 foot on center. The arches at the ends where I turned with the spreader really showed up. A good reason to split the middles or have custom applied with a boom spreader. I use a light bar for guidance and step off the spaces to verify the guidance. Thanks for the input.

GM Guy Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 31 Jul 2012 Location: NW KS / S.C. ID Points: 1988	Post Options Post Reply Quote GM Guy Report Post Thanks(0) Quote Reply Posted: 12 Apr 2022 at 10:34pm
	I'm no math wiz, but if you plan to run a 540 RPM spreader on a 1000 RPM PTO with a adapter (low RPM to save on fuel) I think I had it calculated to run 1270 Engine RPM to equate to 540 Shaft RPM. I pull a Willmar 500 with my 7040, and figured the 426 wouldnt mind the low RPMs with that light of load. In regards to the tach, I prefer to keep stuff original I guess... lol Hy-Capacity offers 3 different pulleys, factory replacements for the factory delco (early) and Niehoff (late) and they offer a conversion pulley when retrofitting a Niehoff unit to Delco.
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