[AJD] Two Cylinder JD's and Power Driven Equipment

[Troy Bogdan]

As a primarily vegetable type farmer, my primary tillage comes from a 6' 
rototiller (similar to your multivator).  A rototiller basically replaces 
both the plow and the disc and does everything in one or two passes 
(depending on soil type and conditions).  We can go from sod to seed bed in 
about 3-4 passes.

I have a 1953 JD 70 that runs that rototiller and has run that rototiller 
for 15 years and although it takes all 50 horses of my tractor to run it, I 
have never, ever had to replace a shaft, bearing or u-joint on that or any 
of my other machines.  I have probably plowed well over 1500-2000 acres over 
the life of that tiller so far and it is still going without worry.

BTW,  you can see for yourself what this tiller looks like on the back of my 
70 in Spencer's "Antique Tractor Bible," I think he shows the rototiller in 
there at least twice, in two different photos.

Just my 2 pence,  Farmer Troy

----- Original Message ----- 
From: "Louis" <louis at kellnet.com>
To: "'Antique John Deere mailing list'" 
<antique-johndeere at lists.antique-tractor.com>
Sent: Wednesday, February 06, 2008 7:13 AM
Subject: Re: [AJD] Two Cylinder JD's and Power Driven Equipment


> We used to grow about 15 acres of strawberries.  They were on raised beds.
> After the picking season was over, we renovated the strawberry fields. 
> One
> of the machines that we used was called a Multivator.  Basically it was 
> five
> rototiller heads mounted on a toolbar (4 row machine).  All the heads were
> powered by a hex shaft that ran from a central gearbox.  The gearbox was
> powered by the PTO.  We always ran this machine on our JD 3010 diesel. 
> The
> 3010 handled it real good.  During renovation, the 3010 broke down.  I had
> just bought a 720 diesel tractor.  I hooked the Multivator up to the 720,
> wow did that ever work that tractor to death. I noticed the Multivator 
> heads
> weren't running as smooth are normal.
>
> Here are my thoughts.  The engine on the 3010 runs at 1900 RPM for rated 
> PTO
> speed.  While the engine on the 720 runs at 1100 RPM for rated PTO speed.
> The 3010 basically has a 3.5:1 ratio from engine to PTO.  The 720 
> basically
> has a 2:1 ratio from engine to PTO.  That is going to take a lot more 
> torque
> to keep the PTO shaft running at rated speed on the 720 than it is on the
> 3010.
>
> Now when it comes to pulling a load (draft) the 720 would walk all over 
> the
> 3010 hands down.  PTO work, forget it.
>
> With all that said, I can see where you would ruin U-joints faster, since
> they are taking a "side" load.  Where a bearing is normally taking a
> rotational load.  I didn't run the Multivator on the 720 long enough to 
> find
> out.  We got the 3010 fixed ASAP, and got that back on the job.
>
> Lou
>
>
> -----Original Message-----
> From: antique-johndeere-bounces at lists.antique-tractor.com
> [mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of
> Duane Ledford
> Sent: Tuesday, February 05, 2008 8:04 PM
> To: antique-johndeere at lists.antique-tractor.com
> Subject: [AJD] Two Cylinder JD's and Power Driven Equipment
>
>
>
> Thought I would ask you folks what your opinion and knowledge is about 
> this.
> Have
> ran across several individuals who claim that if you use any type of PTO
> driven or
> belt driven equipment on a two cylinder JD, that the bearings of the
> equipment will
> be ruined.  Their reasoning is that the uneven firing of the two cylinder
> engine
> pounds on the bearings, universal joints, etc.  I might be able to see 
> this
> if you
> were lugging the tractor for an extended time.  But if this is true, 
> wouldnt
> every
> bearing in the tractor be subject to this pounding, therefore need 
> frequent
> replacing?  Bearings wear out, but I really haven't seen any more 
> frequency
> in JD's
> bearings needing replaced over any other brand.  Has anyone done or heard 
> of
> a
> study of this "rural myth?"  Would be interesting to see measured results 
> of
> the
> differences in stress on equipment between the pulsing  two cylinder 
> engines
> over
> the smoother running four and six cylinder ones.  What has been your
> experience?
> What do you think?
>
>
>
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