Engine RPM vs PTO rpm
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bmaverick
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- Yanmar YM2610 ■YANMAR GURU■ EXTRAORDINAIRE
Just like California said, you don't have to run your attachments at a FULL 540, that's the MAX. I typically run them at 500. At 540, I broke many sheer pins with the bush hog. When I slowed to 500, the pins kept just fine. The bush hog mower is rated at 540, but I can't afford to keep getting pins. Likewise, the gear box on attachments will give you longer years of use at 500 vs. full tilt at 540.
My dad had a Ford 8N. He too didn't run at 540, but 500. Glad to learn his understanding of keeping equipment well used and maintained.
California
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Given the title of this thread here's some information that may help someone someday.
A couple of scans from the YM240 manual, that I posted long ago. I just found them while looking for something else.
I expect this information is reasonably close for any of the YM's if no better information is available.
A couple of scans from the YM240 manual, that I posted long ago. I just found them while looking for something else.
I expect this information is reasonably close for any of the YM's if no better information is available.
bmaverick
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The YM numbers above YM2010 with multi-speed PTOs have a bit different hour-meter RPM tach PTO gauge. Even the YM4310 is way different too because of the OE Yanmar turbo.
This model has the 4-speed PTO
1=542
2=685
3=1005
4=1268rpm
Here's one from a YM2500/YM2610
A YM3810 tach
A YM336 has a tach similar to the John Deere derivatives.
A YM2820 tach is square like the F/FX Series. The YMxx20 machines are really a different level of CUT.
A YM4220 turbo diesel has the same square tach as the YM2820
A simple YM1401 tach, too bad it has moisture on the inside. YM1510 has the same tach.
If you need to find out what Yanmar has what gauges, jump over to the Hoye site and look at the gauge panel for that tractor. There isn't a one-size-fits-all.
Just found a YM1610 with square gauges. Wonder if the round gauges are the oddity while the square are more of the norm.
This model has the 4-speed PTO
1=542
2=685
3=1005
4=1268rpm
Here's one from a YM2500/YM2610
A YM3810 tach
A YM336 has a tach similar to the John Deere derivatives.
A YM2820 tach is square like the F/FX Series. The YMxx20 machines are really a different level of CUT.
A YM4220 turbo diesel has the same square tach as the YM2820
A simple YM1401 tach, too bad it has moisture on the inside. YM1510 has the same tach.
If you need to find out what Yanmar has what gauges, jump over to the Hoye site and look at the gauge panel for that tractor. There isn't a one-size-fits-all.
Just found a YM1610 with square gauges. Wonder if the round gauges are the oddity while the square are more of the norm.
Last edited:
normde2001
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It all has to do with achieving correct mower blade tip speed, (some say OISHA mandated), and depends on gear ratio of the implement, (do the math). I believe a 4' rotary mower blade is generally 16,500 fps. (max 19,000fps for a 18" mower blade).
bmaverick
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By looking at the other hour-meter and tach gauges, this information seems to be what you need. Now, you could back it down to 1800 if you like to keep both the tractor engine and attachment/implement to have a longer life. Just keep the blades sharp. Do you have an 'over-run' clutch on the PTO spline output gear? If not, PLEASE get one. It will save you $$$$ if the PTO breaks from an over-run problem.