Snow 47 Blower Not Throwing Snow Very Far

[RWEST]

My brother picked up a "47" blower over the weekend, and installed it on his 755. When he tried it out, it only throws snow about 1 foot!!

Comparing it with the 47 on the another 755 we have, he noticed there is about 1/2" clearance between the impeller blades and the cylinder the impeller rotates in, while the other 47 (which throws snow admirably) only has about 1/4" clearance in the same area. Thoughts/ideas?

 

[George2615]

Is the 47" blower the same brand as the other one. If not, maybe it operates with a different gear box ratio and requires a higher RPM for the PTO. Also the clearance of 1/2" seems a bit much. Perhaps this blower needs a new impeller with a closer tolerance. Its possible that this blower may require a 1000 RPM PTO instead of a 540. Try rotating the good blower PTO shaft by hand and count the number of turns it takes to make one revolution of the blower impeller then do the same on the one he just picked up. If they are the same then the impeller is worn out and needs replacing

 

[Spudland_Dave]

What did the 47" Blower in question come off of?
I started had started shopping for a 47" Blower for my F935 (which ultimately led me to buy a 3520 Cab...go figure)....but I think there are a few variations/configurations of gearboxes for the 47" Blowers...from the sounds of it, your not turning fast enough.

A quick stroll thru the JD Parts catalog might be your best next step...

 

[RWEST]

It's a front mount blower, which is where it's mounted now, came off a 755, and, according to the previous owner, "it worked fine".

 

[Shawk]

My brother picked up a "47" blower over the weekend, and installed it on his 755. When he tried it out, it only throws snow about 1 foot!!

Comparing it with the 47 on the another 755 we have, he noticed there is about 1/2" clearance between the impeller blades and the cylinder the impeller rotates in, while the other 47 (which throws snow admirably) only has about 1/4" clearance in the same area. Thoughts/ideas?

If everything is hooked up ok... it sounds to me like you simply may have a sheer pin broke somewhere??? Take a peak....

 

[mfreund]

I don't think a 1/4 " difference in impeller is the problem. I'm with Shawk, sounds like shear pin broken. If that is not it I would compare the # if turns the PTO shaft makes to turn the auger 1 turn and compare to other 755. That way you know if it is the right blower. There are some (for 650/750 I think) that turn the opposite way. I would think that would be VERY apparent if that was the problem. All the rest are for the 2000 rpm mid PTO.

Let us know what you find, I am curious

 

[RWEST]

Okay, last night we had a fabricator friend make up/weld some flat to each of the impeller blades, to bring the clearance down to ~1/4". Big difference - now it really throws the snow!!

 

[Redneck in training]

I don't think a 1/4 " difference in impeller is the problem. I'm with Shawk, sounds like shear pin broken. If that is not it I would compare the # if turns the PTO shaft makes to turn the auger 1 turn and compare to other 755. That way you know if it is the right blower. There are some (for 650/750 I think) that turn the opposite way. I would think that would be VERY apparent if that was the problem. All the rest are for the 2000 rpm mid PTO.

Let us know what you find, I am curious

FYI The force it throws snow is proportional to speed squared. The volume of snow it is able to throw is proportional to speed. Thus power required to throw snow is proportional to speed cubed. In other words to double the speed the required power demand increases eight times and it should throw twice as much snow four times as far. Needles to say that this is valid for ideal case and maximum flow of snow.

 

[mfreund]

Glad you got it fixed, I am suprised that little of impeller would make that big of a difference!! Lesson learned

Next question,

What caused the wear. That would be a lot of use for snow to wear down impeller 1/4". Or am I wrong again

 

[RWEST]

What caused the wear. That would be a lot of use for snow to wear down impeller 1/4".

We're still trying to figure that one out. One of the problems with buying something used is you have to take the other guy's word for its prior history. The guy said he'd never gotten into rocks or anything, but I dunno..

Actually, all this is a moot point - my brother slipped on the ice yesterday and broke his arm, so he won't be doing much snowblowing, or anything else that requires a right arm, for a while. Brother #2 or I will be doing it with our blowers (mine is a 60" Lucknow 3-pt; Brother #2's is a 72" front mount monster on a Kubota 4740).