Large Leaf Blower PTO HP question

[pyro29]

So I'm looking at a giant vac 4000 blower. I have a mahindra 4035, which has 33 PTO HP. Giant vac specs call for 40 HP for this model. Does anyone have any experience with running an oversized implement? Will I just not get full output or is this simply a bad combination?

Thank you for the advice.

 

[Dave M7040]

So I'm looking at a giant vac 4000 blower. I have a mahindra 4035, which has 33 PTO HP. Giant vac specs call for 40 HP for this model. Does anyone have any experience with running an oversized implement? Will I just not get full output or is this simply a bad combination?

Thank you for the advice.

pyro29

The answer to your question lies in the Fan curves. This is a radial blade fan.

The horsepower requirements, which is the line with the red arrow pointing to it, shows that the fan power requirements increase with the air flow through the fan identified as % of free delivery (i.e.. air flow) by the green arrow. The more air flow the greater the power requirements.

If someone was giving you the unit then you could try some things to make it work but they would detract from its performance so not too wise.

Cutting down on how much air can get into the fan will reduce the power requirements. However, this will mean that the speed of the air coming out the fan discharge will be slower and may not move the leaves like you want it to.

I expect that what would happen when connected to your tractor, (keeping in mind the manufacturer says it needs 40+ HP and you have 33 under idea conditions), is that the pto speed would slow down like the tractor was under a very heavy load until it got to the rpm representing the peak torque point of your engine and just stay there. Likely the air blast from the fan would be much reduced.

You could cut down on the size of the exit air flow nozzle which would reduce the volume of air going through the fan and still keep the velocity up.

Any reason to go with the 4000 unit instead of something smaller?

It would be a bad combination!

Dave M7040

 

[pyro29]

Dave,

Thank you for the opinion. The reason for the 4000 was two part; first, the unit is for sale at a GREAT price, probably because it is a monster; and second, it is (was) my preferred manufacturer (before they were bought out by SCAG.

LEAF BLOWER----3 POINT

 

[Dave M7040]

Dave,

Thank you for the opinion. The reason for the 4000 was two part; first, the unit is for sale at a GREAT price, probably because it is a monster; and second, it is (was) my preferred manufacturer (before they were bought out by SCAG.

LEAF BLOWER----3 POINT

Useful if you could find out what tractor was operating it.

I still think it is too big for you unless you are running a golf course and would buy a bigger tractor just to run it.

A good comparison would be the people who want to use their small tractor's hydraulics to operate a wood splitter.

Their tractors hydraulic system pump is too small so the time to extend the splitter cylinder is excessive. Now they want to add a high capacity pto driven hydraulic pump only , if they are lucky, hear from someone like me who says you don't have the power to run the big pump.

Instead of racking up run time hours on your expensive tractor, buy a gas powered wood splitter and you will have high productivity.

I learned these lessons from being 70 years old and an engineer. When younger I too wanted to get everything possible out of my tractor.

Dave M7040