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granville


Joined: Oct 30, 2009
Points: 30

shifting gears without stopping
Original Message   Dec 31, 2009 11:31 am
I have a JD 1130 . My wife was using today and I noticed her shifting forward gears without stopping. Will it hurt the machine?  In the manual it says not to do it. She said she had done it several times  and it always worked . I just hope she hasn't caused any damge.
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samdog


Joined: Feb 9, 2010
Points: 55

Re: shifting gears without stopping
Reply #8   Feb 11, 2010 2:41 am
The friction disc drive was patented in 1904 by John Lambert. Here is a quote from the John-meister himself:

"In practice I have found that this combination of aluminum and fiber bearing surfaces gives the maximum
degree of friction and durability, thereby especially adapting the gearing for use on motor vehicles of the
heavier kind, where the friction surfaces are at times subjected to great strains, and must, therefore, have
a frictional contact of a high degree of efficiency in order to avoid slipping. It will be observed that the
aluminum is advantageous also, because it will not tarnish or rust appreciably, but will always present a
smooth, clean surface to the fiber periphery, so that wear will be reduced to a minimum."

and John oughta know -- his Lambert touring cars were quite sucessful. Here's one with the friction disc exposed:

 

 Now if John says they must have a high degree of frictional contact, I believe him.
So shifting while the disc is firmly in contact would cause excessive wear to the components.
Toro would agree -- they say not to do it in my manual.

Here's a snowblower friction disc:

 

It seems obvious from the size of the spring holding the rubber wheel to the plate that moving it without releasing
it is going to cause wear. After all it's tight enough to carry a load of 9, 10, 11 or more foot-lbs of torque.

Anyway that Lambert friction wheel would be an awesome mod for high speed travel over to the neighbor's driveway!

tkrotchko


Location: Maryland
Joined: Feb 9, 2010
Points: 143

Re: shifting gears without stopping
Reply #9   Feb 11, 2010 5:49 pm
The friction disk drive is brilliant in it's simplicity.  When I first took apart a snow blower, I didn't get it until I move the gearshift lever and watched what happened. 

What really made me smile is when I shifted into reverse and it's so obvious what happens that you can't believe it at first.
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