Measuring/calculating PTO speed (not PTO speed = Machine speed / implement speed)

[OldNick]

In this case, it doesn't have any marks. It may be written on a sticker somewhere though.

Hinomoto N279 Dash

View attachment 783571

Well if it has markings elsewhere, I can't find them

 

[OldNick]

Y

The tachometer should have an indicator that shows what engine speed is needed for 540 pto rpm. This one is at 2500 engine rpm:

View attachment 783570

es but in what PTO gear? Anyway I see no such markings on my Tach

 

[OldNick]

^^^^Yup.....get a tach if you dont have an owners manual.

But an unfamiliar machine to you....I'd do some web searching and see if you can find an operators manual

HAH! You reckon I have not tried? I am currently not being replied to by tomanuals.com, because they are they the only ones who even offer a manual.

 

[ptsg]

Y

es but in what PTO gear? Anyway I see no such markings on my Tach

It's very common for these smaller Japanese tractors to have 4 PTO speeds. Something like 540 - 750 - 860 - 1000. All achieved at the rated RPM, probably in the 2500 engine RPM range like Ruffdog says.

It's also common to use the 750 RPM with less engine RPM to achieve 540 PTO RPM with less engine RPM, also known as 540E (E for economy).

 

[OldNick]

That or similar^

Just don't get anywhere close to that spinning shaft, especially at 540. I'd probably mount it somehow to take some measurements, no way I'd hold it close to the shaft.

But isn't that why you use a laser? I know caution is needed, but try table saws and other stuff. "Stay away" is just common sense.

I have to admit that the proliferation of techno solutions does produce a loss of awareness. And that farming is still up there as the most dangerous job.

 

[ruffdog]

It's very common for these smaller Japanese tractors to have 4 PTO speeds. Something like 540 - 750 - 860 - 1000. All achieved at the rated RPM, probably in the 2500 engine RPM range like Ruffdog says.

It's also common to use the 750 RPM with less engine RPM to achieve 540 PTO RPM with less engine RPM, also known as 540E (E for economy).

It should be noted that running a higher pto gear at a lower engine speed will greatly reduce available HP.

 

[WranglerX]

OK. That laser thingy looks cheap enough to give a go without killing my bank balance. Even at the USD Aud exchange rate, I have a couple of jobs for it, right now. Thank you

Check to see if there is a optical tachometer app for a cell phone .....

 

[ruffdog]

I have an old mechanical tachometer for reading rpms of the end of shafts. The new mechanical ones cost more than the electrical ones.

 

[WranglerX]

I have an old mechanical tachometer for reading rpms of the end of shafts. The new mechanical ones cost more than the electrical ones.

Like this?..

 

[5030]

I use a Stewart Warner direct contact tachometer to measure pto speeds.