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JD 60 has no lugging power

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Dwight

01-16-2002 07:20:46




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I have a 60 that seems to have no lug when a load is put on it. What we do is use a steel skid with a tractor sitting on it and tug pull to check out the running of the tractors. Compression is good (120 psi cranking speed), timing is correct, carb settings seem to have no difference in effect, all gaps, etc. are correctly set. Breather is even currently unhooked. I know this is not much info, but I am stumped. I've never had one that did this. My 1950 model A seems to be a bunch stronger (both the 60 and the A were tested in 2nd gear). Any suggestions?

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G Taylor

01-19-2002 08:36:39




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
A worn cam/lifters and/or weak valve springs will give great compression tests but impared breathing at working rpms.



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DON

01-18-2002 12:04:17




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
Check to see if the govoner spring has pulled the carb wide open under full load. A week spring will not pull it open and cost you a lot of power,put on a new one rather than try to adjust it.Don



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mrm

01-16-2002 14:37:04




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
Lots of good ideas but be sure to use a timeing light to set timeing and check for advance through
rpm ranges to make sure advance isn't stuck. If the JD A has cast iron pistons and your 60 has aluminum ones cast iron pistons lug better. Would be nice to dyno both and check for HP diff.
I've drove lots of late B's and 50's and the B's
always seem to put more power to the ground,some of this is probabaly because their lighter.

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LDL

01-18-2002 20:30:09




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 Re: Re: JD 60 has no lugging power in reply to mrm, 01-16-2002 14:37:04  
Cast iron pistons do not lug better than aluminum. You only need enough weight built into an engine to give it structural integrety and to smooth it out. Anything more is just dead weight. Do the math.



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mrm

01-19-2002 18:12:34




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 Re: Re: Re: JD 60 has no lugging power in reply to LDL, 01-18-2002 20:30:09  
Thats your opinion! But the fact of the matter is
I can tell what pistons are in a JD "A" by driving it!



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ChuckW

01-16-2002 14:36:02




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
if you want to get some real ignition, change over to electronic...you want have standard ignition ever again....recommend Genessee Electronics.



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na

01-16-2002 14:28:15




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
of course it doesnt have lugging power, it is a deere



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Dwight

01-16-2002 20:11:07




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 Re: Re: JD 60 has no lugging power in reply to na, 01-16-2002 14:28:15  
Thanks for nothing. You apparently have the mindset of my 5 yr. old



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Jack

01-16-2002 10:08:08




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
Dwight,I have a similar problem with my 70 and the timing,points,fuel,rocker arms and plugs are set right and I have a paper element on it but only turns 43 hp on the dyno.I am beginning to suspect the cam may be my culprit.When I rebuilt my 70 I looked at the cam and it looked good but my eyes are not calibrated and I should have had it checked.I have considered getting a pulling cam from Denglers.If you find your problem,let me know what it was if you don't mind.

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poorerbut

01-16-2002 12:56:42




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 Re: Re: JD 60 has no lugging power in reply to Jack, 01-16-2002 10:08:08  
Hey, Jack. Did you check your coil ? I thought
my '53 was a little sluggish when I first got her
back together and went through the whole ordeal
rechecking what I hadn't already replaced or rebuilt without any luck. I hadn't mic'd the
cam lobes, (didn't even think about it) while it
was down, but I did swap coils, just on a whim,
and it made a noticable difference. I won't say
100% that the coil was the problem, and it could
have been a combination of different things, but
it sure pulls the harrowgator(?) a lot better.
I've never had her on the dyno, so I couldn't
give you any idea on hp, but from 3rd to 4th gear was a big change for me. Just a thought. pb

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Deere Puller

01-16-2002 09:58:19




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
We had a 620 that suffered from the same problem several years ago - we found out once she was home from the auction! (Probably why it went in the first place). After overhauling the carb, checking the distributor & air cleaner, we decided to take a peek inside. What we found was that the cam was worn considerably, affecting both lift and duration to the point that it simply wouldn't work hard. Under idle it was OK (not great, but acceptable). You may want to pull the tappet cover & 1st check the valve lash. It should be .020 hot, which if the tractor isn't going to be worked hard or long at any one time is OK as a cold measurement. If the valves are in adjustment, take the lash to .000 just before LH Impulse and measure the max lift as the crank is turned & compare to spec. This will give you an idea of what your cam is actually doing & whether it may be the culprit, as it was on our 620. Good Luck

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phil

01-16-2002 09:18:16




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
Dwight, it might be a weak spark. As the throttle opens wide, the manifold vacuum drops to almost nothing. A full charge of air/fuel flows into the cylinder so the compression will be at its highest. High pressure means high impedance across the plug air gap. Maybe you could remove a plug wire & compare the spark of the 60 to the A. Or gap the plugs down to about .020 to see if it has an effect.

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Dwight

01-16-2002 09:22:20




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 Re: Re: JD 60 has no lugging power in reply to phil, 01-16-2002 09:18:16  
Both have Distributors. What would need to be replaced if the spark is weak?



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Dwight

01-16-2002 09:22:15




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 Re: Re: JD 60 has no lugging power in reply to phil, 01-16-2002 09:18:16  
Both have Distributors. What would need to be replaced if the spark is weak?



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phil

01-16-2002 10:11:38




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 Re: Re: Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 09:22:15  
I would proceed in this order - plugs, points & condenser, plug wires, rotor, distrib cap, coil. For some reason, I get poor results from filed points, so I always replace points rather than try to file them. Plug wires are often a problem. Be sure not to use the 'radio suppression' wires, you need solid copper wire.



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Ted K

01-16-2002 08:39:54




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 Re: JD 60 has no lugging power in reply to Dwight, 01-16-2002 07:20:46  
Is the governor working properly?



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