Randall replied:
>>> Must be one heavy lawnmower, if it can pull 1600 pounds on turf tires !
Actually, my favorite lawn mower is a 4wd Kubota with fat traction tires
(!). and it would only have to pull the 800 pound capability of the Cub.
.
>>> Note that the test only mentions the rated horsepower, the actual
drawbar
horsepower demonstrated in their test G is more like 8.75.
I'll explain the test procedure: the 25% miraculous gain in test G dbhp
was
achieved by the allowance of unlimited cast iron and/or liquid tire-fill
weight. . . in some cases, tractor are loaded with ballast weights
approaching the weight of the tractor itself; not practical for daily use
and really tough on the tractor.
>>> Of course, tractive effort is not the same thing as drawbar horsepower,
a
5hp tractor can out-pull a 15hp tractor ... if it weighs more and has the
right gears ... it just does it slower.
True, and a kitten-on-a-treadmill could . . . etc., etc., but the Cub is
at
a distinct disadvantage here . . It's lowest gear (the test tractor in
#386)
is a really rapid 2.14 mph, that's high gearing. Serious tractors will
have one or more gears under one mph.
>>> I certainly can't claim to know, but I thought the 1200 rpm PTO was
something of a standard in the 15hp and under class.
AFAIK, only on the Cub and maybe two semi-rare Japanese units. The 6
spline
1 1/8" or 1 3/8" PTO running at approximately 540 rpm was a pretty
universal
standard for decades on all sizes of serious tractors. To lower the
u-joint and driveline stress, a 1000 rpm standard was adopted in the
sixties for larger tractors . . like 70 HP and up. Some tractors had
coaxial drives for the PTO . . An owner could have a 540 rpm stub AND a
1000
rpm stub, each engaging it's proper driveshaft.. The standard required the
different splines to prevent over-speeding of 540 implements by mistake.
Some 540 tools would be destroyed if run at 1000.
(The Servis G60 stalk shredder for one)
I'm getting out-of-date on the new stuff but I'll try to be helpful on
anything up through the eighties.
Tony in Texas
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