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

[Louis]

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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