Snowblower operating speed

Berry

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Equipment
B7200HST B2551 Blower Scraper Flail Mower Chipper Log Splitter
Jun 7, 2020
133
7
18
Bancroft Ontario
Time for the snow blower; I'm running a B7200HST with a 2 speed mid PTO driving a B2551 snow blower. My PTO is rated at 1546 and 2455 with engine RPM of 2500. My question is, what speed do you operate the mid PTO, high or low. The reduction on the input ahead of the reducer is 40:1. With that the impeller is about 60 rpm On high, it just seems so fast for the drive shaft. She is an old girl!!!
 

DeepWoods

Well-known member

Equipment
B2650HSDC Woodland Mills WC68 Wood Chipper
Apr 10, 2019
335
265
63
Bigfork Minnesota
On my B2650HSDC, the mid pto runs at engine rpm, so when I blow snow at full throttle I'm at 2500 rpm. If I get into deep snow I can drop 500 rpm easily, and have to back off on the forward motion of the tractor to regain rpm. I only have 19.5 up on the pto, so full throttle it is.
 

Dave_eng

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M7040, Nuffield 465
Oct 6, 2012
5,225
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Williamstown Ontario Canada
I want to point out a couple of facts which may not be completely clear.

This blower was made for both 3 pt hitch and mid pto front mount.

The worm gear box between the auger halves is designed to run at 540 rpm which is the standard rear pto speed.

When used in a mid pto application, a chain reduction sprocket set was placed between the mid pto shaft and the back of the blower to lower the rpm that the blower sees to 540 rpm.

The chain reduction ratio would be approximately 4.6 to 1. This from 2,500 mid pto rpm divided by rear pto rpm of 540.

Please count the teeth on the two sprockets and advise as a ratio of 40:1 seems most unlikely.

Dave

forum B2551 blower.jpg
 

Berry

Member

Equipment
B7200HST B2551 Blower Scraper Flail Mower Chipper Log Splitter
Jun 7, 2020
133
7
18
Bancroft Ontario
I want to point out a couple of facts which may not be completely clear.

This blower was made for both 3 pt hitch and mid pto front mount.

The worm gear box between the auger halves is designed to run at 540 rpm which is the standard rear pto speed.

When used in a mid pto application, a chain reduction sprocket set was placed between the mid pto shaft and the back of the blower to lower the rpm that the blower sees to 540 rpm.

The chain reduction ratio would be approximately 4.6 to 1. This from 2,500 mid pto rpm divided by rear pto rpm of 540.

Please count the teeth on the two sprockets and advise as a ratio of 40:1 seems most unlikely.

Dave

View attachment 51367
Dave you are absolutely right my ratio is 4:1, 40 teeth on one gear and 10 on the other. I calculated operating engine at 2210 to obtain the final 540. Thank you for the response. I dont know what I was thinking about today as I had checked the ratio last spring. Memory goes with time. Thanks agsin
 

Berry

Member

Equipment
B7200HST B2551 Blower Scraper Flail Mower Chipper Log Splitter
Jun 7, 2020
133
7
18
Bancroft Ontario
On my B2650HSDC, the mid pto runs at engine rpm, so when I blow snow at full throttle I'm at 2500 rpm. If I get into deep snow I can drop 500 rpm easily, and have to back off on the forward motion of the tractor to regain rpm. I only have 19.5 up on the pto, so full throttle it is.
Dave was right on with the ratio and speeds, it all works out and matches close to your 2650. I ran today on high PTO, 2100 RPM approx on the long shaft just seams so fast. LOL waiting for clearance from the control tower for take off!!
 

Berry

Member

Equipment
B7200HST B2551 Blower Scraper Flail Mower Chipper Log Splitter
Jun 7, 2020
133
7
18
Bancroft Ontario
Dave you are absolutely right my ratio is 4:1, 40 teeth on one gear and 10 on the other. I calculated operating engine at 2210 to obtain the final 540. Thank you for the response. I dont know what I was thinking about today as I had checked the ratio last spring. Memory goes with time. Thanks agsin
 

Berry

Member

Equipment
B7200HST B2551 Blower Scraper Flail Mower Chipper Log Splitter
Jun 7, 2020
133
7
18
Bancroft Ontario
P.S. thanks for the manual, I've been looking for this for some time.
 

Dave_eng

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M7040, Nuffield 465
Oct 6, 2012
5,225
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113
Williamstown Ontario Canada
Dave you are absolutely right my ratio is 4:1, 40 teeth on one gear and 10 on the other. I calculated operating engine at 2210 to obtain the final 540. Thank you for the response. I dont know what I was thinking about today as I had checked the ratio last spring. Memory goes with time. Thanks agsin
It is easier to assess from a distance where you do not hear the whine of the pto drive and blower fan :)

Dave
 
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nbryan

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Equipment
B2650 BH77 LA534 54" ssqa Forks B2782B BB1560 Woods M5-4 MaxxHaul 50039
Jan 3, 2019
1,227
763
113
Hadashville, Manitoba, Canada
I always run the mid-pto at 2500 rpm for the front mount blower, a B2782B, the operating rpm for the tractor.
 

NicO

Member

Equipment
Kubota B7200
Jan 29, 2021
31
0
6
BC, Canada
Dave you are absolutely right my ratio is 4:1, 40 teeth on one gear and 10 on the other. I calculated operating engine at 2210 to obtain the final 540. Thank you for the response. I dont know what I was thinking about today as I had checked the ratio last spring. Memory goes with time. Thanks agsin
I want to point out a couple of facts which may not be completely clear.

This blower was made for both 3 pt hitch and mid pto front mount.

The worm gear box between the auger halves is designed to run at 540 rpm which is the standard rear pto speed.

When used in a mid pto application, a chain reduction sprocket set was placed between the mid pto shaft and the back of the blower to lower the rpm that the blower sees to 540 rpm.

The chain reduction ratio would be approximately 4.6 to 1. This from 2,500 mid pto rpm divided by rear pto rpm of 540.

Please count the teeth on the two sprockets and advise as a ratio of 40:1 seems most unlikely.

Dave

View attachment 51367
Hi there,
If I’m convinced that my blower was used in the front with PTO electric clutch by the previous owner, what gear ratio will it be so that I can be sure? AND, if I want to use it on the rear, will I need to change this gear ratio? Any other things I should be doing?
I need to have a 3pt hitch frame made up as I don’t have one.
cheers
 

Dave_eng

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Equipment
M7040, Nuffield 465
Oct 6, 2012
5,225
1,011
113
Williamstown Ontario Canada
Hi there,
If I’m convinced that my blower was used in the front with PTO electric clutch by the previous owner, what gear ratio will it be so that I can be sure? AND, if I want to use it on the rear, will I need to change this gear ratio? Any other things I should be doing?
I need to have a 3pt hitch frame made up as I don’t have one.
cheers
For rear 3 pt operation you will need to completely remove the reduction chain drive as shown in my earlier post.

After doing that, as far as pto operation speed, you are good to go.

Dave
 

NicO

Member

Equipment
Kubota B7200
Jan 29, 2021
31
0
6
BC, Canada
For rear 3 pt operation you will need to completely remove the reduction chain drive as shown in my earlier post.

After doing that, as far as pto operation speed, you are good to go.

Dave
Great thank you!

will it be a specific 3pt frame I need, or are they fairly generic. Looks like I might need to get one specially fabricated to fit.
 

jabloomf1230

Active member

Equipment
B 3200
Sep 28, 2014
125
34
28
Voorheesville, NY
I always run the mid-pto at 2500 rpm for the front mount blower, a B2782B, the operating rpm for the tractor.
That's also what I do. As long as you don't lug the engine, it seems okay also to run at a lower RPM like 2100, but then you may be more prone to clogging the chute and having ice buildup on the rotors. It really depends on the water content of the snow.
 
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kubotasam

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Equipment
B2410, B7100dt, B7500,Woods BH750,Landpride 2660RFM, Tiller, B2781 Snowblower
Apr 26, 2010
1,202
128
63
Alfred Maine
Great thank you!

will it be a specific 3pt frame I need, or are they fairly generic. Looks like I might need to get one specially fabricated to fit.
Here are some pictures of the rear mount B2551 snow blower I had a few years back
IMAG0063.JPG
IMAG0065.JPG
IMAG0068.JPG
 

Attachments

Dave_eng

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M7040, Nuffield 465
Oct 6, 2012
5,225
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113
Williamstown Ontario Canada
Great thank you!

will it be a specific 3pt frame I need, or are they fairly generic. Looks like I might need to get one specially fabricated to fit.
Amazon sells this one which for $69.99 is worth checking out.

Amazon

The big issue is the distance between the lower lift pins at 21" compared to what you need to fit your hitch.

forum 3 pt hitch frame .jpg


Dave
 

nbryan

Well-known member

Equipment
B2650 BH77 LA534 54" ssqa Forks B2782B BB1560 Woods M5-4 MaxxHaul 50039
Jan 3, 2019
1,227
763
113
Hadashville, Manitoba, Canada
That's also what I do. As long as you don't lug the engine, it seems okay also to run at a lower RPM like 2100, but then you may be more prone to clogging the chute and having ice buildup on the rotors. It really depends on the water content of the snow.
I just engage pto at 1200ish and throttle up to somewhere near 2500 rpm, parked. If starting cold a minute at 2000 and that's it. Then 2500ish all the way. Then I get going and let my hst pedal position (speed) manage the load so there's no lugging.
 

Dave_eng

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M7040, Nuffield 465
Oct 6, 2012
5,225
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113
Williamstown Ontario Canada
I just engage pto at 1200ish and throttle up to somewhere near 2500 rpm, parked. If starting cold a minute at 2000 and that's it. Then 2500ish all the way. Then I get going and let my hst pedal position (speed) manage the load so there's no lugging.
Just want to make certain you are aware of Kubota's trans/hydraulics warm up recommendations.
forum warmup.jpg

You deviate from these recommendations at the risk of expensive damage.
Dave
 
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nbryan

Well-known member

Equipment
B2650 BH77 LA534 54" ssqa Forks B2782B BB1560 Woods M5-4 MaxxHaul 50039
Jan 3, 2019
1,227
763
113
Hadashville, Manitoba, Canada
Just want to make certain you are aware of Kubota's trans/hydraulics warm up recommendations.
View attachment 54140
You deviate from these recommendations at the risk of expensive damage.
Dave
Yes, I take great care to warm my tractor before using. That chart is pretty much what I do.
I was referring to the snow blower warming up at less than full engine rpm for a minute or so. Not the tractor! Getting the grease and gear oil flowing a bit before hitting the snow.
 

Dave_eng

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M7040, Nuffield 465
Oct 6, 2012
5,225
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113
Williamstown Ontario Canada
Yes, I take great care to warm my tractor before using. That chart is pretty much what I do.
I was referring to the snow blower warming up at less than full engine rpm for a minute or so. Not the tractor! Getting the grease and gear oil flowing a bit before hitting the snow.
Glad to hear what your common practice is. I did not read your post like that and was concerned. Not everyone has nor reads an Operators' manual.

Dave
 
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jabloomf1230

Active member

Equipment
B 3200
Sep 28, 2014
125
34
28
Voorheesville, NY
I was surprised that no one before Dave_eng mentioned warm-up time before. Another option that is handy is a block heater. On most of the smaller tractors, the Kubota OEM part is a quick install on a nice Spring day.