540 RPM or 960 RPM on 4' Snow blower~???

[joekimtkd]

One of my friend told me to try 960 RPM on PTO for 4' LAZY snow blower~!

I had a chance today to try 960 RPM and OH MY GOD~~~!!! I think it throws snow 50 to 60 feet away easily on 1500 engine RPM.

With 540 RPM on PTO will throw snow maybe 20 feet, If I'm lucky.

If I use 960 RPM on PTO, wouldn't it loosing torque by a half~?

This snow blower is very small as 42" auger and added wing makes 52" wide now.

When I use it on 540 RPM on PTO, it runs very lazy. I have to give throtle hard to make it to work.

but on 960 RPM on PTO, it runs very nicely and throws snow amazingly on 1500 engine RPM.

I believe 2200 rpm on engine makes 540 rpm on PTO.



So if it runs on 1500 engine rpm, on 540 rpm PTO speed (A) will be,
A = (540 x 1500) / 2200 = 368 rpm.

And if it runs on 1500 engine rpm, on 960 rpm PTO speed (B) will be,
B = (368 x 960) / 540 = 654 rpm.

And I'm not sure about rated PTO rpm on that snow blower.
I think that snow blower was custom made some how.

Do you think that is safe to run on 960 rpm on PTO~~~~~??????????

I was soooooo happy today, ALSO sooooooo scared~!

Joe.

 

[Michael]

See the gear box, see the chain drive, see the sprocket, see them fly apart at the higher speed, see you sitting over the top of all this. See yourself being injured or killed by the flying parts.


USE 540 RPM ONLY!! You do not know if the parts are designed for the higher speed.

 

[eserv]

Well, that isn't entirely true! A rig has to turn fast enough to do the job! My snowblower runs at 1000 rpm but it is designed for that speed. I don't know the ratios on your machine and I can't tell from the picture if it is single or duel stage. In either case the fan that is blowing the snow should be turning at 540 to 600 rpm to do a good job. Of course, wear goes up at square of the speed so things will wear faster and fly further when they come apart at the faster speed. also keep in mind that a rock or childs toy thrown by your blower will go much further than the snow goes!
ED

 

[dusty-t]

I have a 4 ft blower on my B8200. It is a ford blower that I put extensions on to make it a little wider than the tractor. It has a gear box no chain. I run it at mid range on the pto. If I run it at 540 I have to rev the snot out the tractor to get it to throw any distance. I think the middle speed on the pto is about 875 rpm. So at mid throttle I am still spinning the blower fast enough to blow snow but if I hit wet stuff all I have to do is rev it up so it doesn't plug. And grease it more often. And with any snow blower if you are not paying attention to where your snow is going then your are headed for trouble. Even ice chunks in the snow can take off like a rocket. You watch the big machines and they throw a lot farther and a lot faster than we would with a 540 machine at a thousand rpm. My blower runs smooth at 875 if it was vibrating or giving me the heebee jeebee's in any way I would not do it. You have to know your machine and what it is and is not capable of, including taking some one's head off. whether at 540 or 3000 rpm. dusty

 

[dusty-t]

Wow I just read back on this thread and saw your post Joe and the picture. If nothing else get some guards on those chains. They are going to break at some point in the life of the blower and can be very dangerous whether at 540 or 960 rpm. dusty

 

[hav24wheel]

On my L275 I have a single speed PTO, its a 540 rpm. With that said, the engine has to be up around 2700 rpm for the pto to be turning at 540 rpm. On the tach there is a thick line, at the point the pto should be run at. The blowers, and other atatchments should work great at the rated speed. But if you are only running the motor at 1500, with the pto set at 540 rpm, its far from that speed, so I would say it you are set at runnin 1500 rpm, do some math, and figure out what pto setting will get the blower closest to the rated speed at your desired engine speed.

 

[joekimtkd]

I believe 2200 rpm on engine makes 540 rpm on PTO.

So if it runs on 1500 engine rpm, on 540 rpm PTO speed (A) will be,
A = (540 x 1500) / 2200 = 368 rpm.

And if it runs on 1500 engine rpm, on 960 rpm PTO speed (B) will be,
B = (368 x 960) / 540 = 654 rpm.

Following calculation is to figure out on PTO speed vs. engine RPM.

540 = (C x 960) / 540
960 C = 540 x 540
C = (540 x 540) / 960 = 303 rpm
C is PTO speed of 540 rpm selected on actual 540 rpm speed on PTO.


303 = (540 x D) / 2200
540 D = 303 x 2200
D = (303 x 2200) / 540 = 1234 RPM.
D is engine rpm on 303 rpm on 540 rpm selected on actual 303 rpm speed on PTO.

So, if I set it on 960 rpm PTO and keep engine speed on 1234 rpm will get me exact 540 rpm on actual PTO speed.

On the other hand, select 540 rpm PTO and keep engine speed on 2200 rpm will get me same 540 rpm on actual PTO speed.

Now, question is 1234 rpm engine speed to get 540 rpm on PTO?
or 2200 rpm engine speed to get 540 rpm on PTO?

To me, lower engine RPM is the winner~ BUT, What do you think~?

And it is 2 stage snow blower, Ed. and I always watch if peoples or cars around me first before engaging snow blower. I do use snow blade more now though.
and it is look alike custome made snow blower. so I can't find any specification plate.

and Thanks for the tip on chain guard. Thank you, Dusty and Vic.
You guys are my life saviour again.......
I will tell my welding guy to make one. and snow blade side wing. and loader hydraulic pipe guard too...

Thank you for your help.

Happy new year again.

Joe.

 

[hav24wheel]

If your not lugging the engine too much at the lower engine rpm, I'd say go for it. but if the engine is lugging, than use the higher engine rpm, as long as the actual PTO rpm is 540.

 

[dusty-t]

We just don't want you to get bored with your equipment Joe. I agree with you about running the tractor at the lower rpm. You and I have about the same size blower, but your tractor has about 3 more pto hp than mine and mine has no problem with having enough torque at 15 or 1800 rpm. So your tractor should have no problems either.