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Farmall A PTO question

M

Mike Burns

New User
Regarding my Farmall A with a belly mower, is there any speed difference between mounting the drive pulley on the rear or side of the pto? I am trying to gain some rpm for the deck belt and this would be the easiest solution, if it is by chance faster. Thanks in advance.
 
There is only rear PTO. The "side" output shaft is for the belt pulley. The belt pulley does turn at a higher speed than the PTO. I"ve seen them driven both ways. A bigger pulley on the PTO shaft would also turn the mower belt faster.
 
Red Dave,

Thanks for the reply. I am currently using the rear output shaft to drive the top of two pulleys on the belly mower and then another belt on the same double pulley to drive the deck. I have the largest pulley that I can fit on the rear, 9" diameter, and is driving a set of 4 1/2 pulleys for the blades. I need to get the blades spinning faster and, short of putting a 3 inch pulley on the top of the mower deck, would like to know if moving the drive pulley to the side shaft would give me an increase. Any thoughts? Thanks!
 
I'm sure it can be done, but you've got to take into consideration that the belt pulley shaft turns at a rated speed just over twice that of the PTO, 1147 rpm vs 541. I doubt very seriously you want your blades running twice as fast as they are now. But those are the numbers.
 
woods 59a belly mower on super a runs on the belt pulley shaft, the one that is out the side of housing. if your mower is a woods the manual and set up instructions is on their web site. hope this helps. leroy
 
The mower that we bought with our 1966 140, an IH Danco C-4, had the same set up you describe, one belt to a bull idler, then a platform belt to the spindles and was designed to be driven from the 1147 rpm side belt pulley. It would be nice to know the spec RPM of your blade spindles and work backwards to the drive pulley. It's just math.
 
I have a similar setup on my Super A...bought with Woods L503 mower and the "belt pulley" drive, although this is a single groove "B" sheave with a QD (flanged) taperlock to the spline.

This is an odd setup at best...there is very little official info about the Woods L503 mower although all parts appear to be "factory" and not modified to fit.
 
Thanks for the reply. Mine was originally a rear mount Woods mower that was converted to a belly mower by using just the deck, pulleys, and spindles. I need them to spin faster but did not know what rate the belt pulley shaft spun and now seem to have a consensus that it is 1147 rpm. Now I just need to revise my configuration and should be all set. Thanks for the information and quick reply.
 
Thanks for the reply. Mine was originally a rear mount Woods mower that was converted to a belly mower by using just the deck, pulleys, and spindles. These were driven by an enormous pulley via driveshaft off the rear PTO of a Kubota and spun the pulleys that I have now, which I kept from the original configuration. I need mine to spin faster then they are now but did not know what rate the belt pulley shaft spun and now seem to have a consensus that it is 1147 rpm. My drive pulley is 9 inches across and is driving a 4 1/2 inch double pulley that drives the deck belt so switching to the side will double my current rate. Now I just need to revise my configuration and should be all set. Thanks for the information and quick reply.
 
Thanks for the reply. Mine was originally a rear mount Woods mower (RM59) that was converted to a belly mower by using just the deck, pulleys, and spindles. I need them to spin faster but did not know what rate the belt pulley shaft spun and now seem to have a consensus that it is 1147 rpm. Now I just need to revise my configuration and should be all set. I appreciate your quick response. The key was finding out that the belt pulley shaft is twice as fast. Thanks again!
 
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