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Discussion Starter · #1 ·
2009 47” snowblower. Purchased new. It’s been a good until this years install. Blower is now making a loud rhythmic banging noise, after one snow fall.
I decided to install new auger bearings, and a new enclosed chain unit. it’s still making the noise. I am perplexed on what is causing it. Sounds like it’s coming from the impeller area.
Thinking of replacing the gear box now. Can’t figure out what else it could be.
Gear box oil did have some fine glitter but nothing big. Repainted the entire inside Housing. The Auger or the impeller does not appear to be hitting anywhere noticeable.
 

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If you disconnect the PTO shaft and rotate the unit by hand does it make the same banging noise? If so, check carefully to make sure the impeller isn't contacting the housing and also make sure the inside tips of the auger are not contacting the bevel gearbox.
 
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Please update your GTT profile so its clear what machine the snow blower is used on, etc. so we know hitch type and other details.

Just to be clear, did the repainting happen before the season and if so, to what extent was the blower disassembled during the repainting? Also, it sounds like the new chain case and auger bearings were an attempt to resolve the new noise, or were they part of the pre season repainting project and after their install, the new noise was noticed? The Auger bearings can make strange noises if not torqued correctly or not aligned correctly.

The gear box is pretty expensive and I wouldn't replace that unit unless there was a confirmed failure within the gear box. Have you ruled out the noise could be coming from the carrier bearings on the hitch or the tractors PTO shaft?

There is a serial number break on the 47" snow thrower at 150000 or lower and 1500001 and higher. While the gear boxes are the same for these two series of machines, make sure the parts you did replace were consistent with the serial number of your 47" snow thrower. Since I wasn't sure what tractor you have the snow blower mounted on, I selected the x750 simply to get into the 47 snow throwers used in the last 15 years or so...............

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Discussion Starter · #4 ·
Please update your GTT profile so its clear what machine the snow blower is used on, etc. so we know hitch type and other details.

Just to be clear, did the repainting happen before the season and if so, to what extent was the blower disassembled during the repainting? Also, it sounds like the new chain case and auger bearings were an attempt to resolve the new noise, or were they part of the pre season repainting project and after their install, the new noise was noticed? The Auger bearings can make strange noises if not torqued correctly or not aligned correctly.

The gear box is pretty expensive and I wouldn't replace that unit unless there was a confirmed failure within the gear box. Have you ruled out the noise could be coming from the carrier bearings on the hitch or the tractors PTO shaft?

There is a serial number break on the 47" snow thrower at 150000 or lower and 1500001 and higher. While the gear boxes are the same for these two series of machines, make sure the parts you did replace were consistent with the serial number of your 47" snow thrower. Since I wasn't sure what tractor you have the snow blower mounted on, I selected the x750 simply to get into the 47 snow throwers used in the last 15 years or so...............

View attachment 821710
The noise started while removing the first snowfall here in SW Michigan (last week). When the unit was disassembled. I paint the inside of the housing, removing some rust, etc. In addition to replacing the auger bearings, I replaced the chain sprocket with the new enclosed chain case. Yes, the new bearings and enclosed chain parallel unit was installed in an attempt to fix the noise. The blower has been used on my previous x585 and now my x738 purchased in 2019.
Serial Number on the blower is 212780.
i did not replace the 2 grease bearings in the steel impeller. I read a old post mentioning a set screw or bolt fixing the impeller to the gear shaft, along with the key of course. I am not aware this unit has a bolt for the impeller.
 

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Any chance your driveshafts are out of phase? You could possibly have a loose / bad u-joint? I'd remove the front implement (short) driveshaft and the mid-driveshaft and thoroughly inspect them. The mid-driveshaft may be bent or rubbing somewhere underneath the tractor.
 

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Discussion Starter · #6 ·
The noise started while removing the first snowfall here in SW Michigan (last week). When the unit was disassembled. I paint the inside of the housing, removing some rust, etc. In addition to replacing the auger bearings, I replaced the chain sprocket with the new enclosed chain case. Yes, the new bearings and enclosed chain parallel unit was installed in an attempt to fix the noise. The blower has been used on my previous x585 and now my x738 purchased in 2019.
Serial Number on the blower is 212780.
i did not replace the 2 grease bearings in the steel impeller. I read a old post mentioning a set screw or bolt fixing the impeller to the gear shaft, along with the key of course. I am not aware this unit has a bolt for the impeller.
my post here was confusing. The shear bolt is the only thing keeping the impeller attached to the drive chain and the augers. Correct?

If the impeller was bolted to the shaft. That would defeat the shear bolt system.
Ill inspect the drive shaft / u joint connection next.
 

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If all else fails unbolt the sacrificial bolt (shear bolt) that keeps the impeller spinning and spin the impeller by hand. easy to try, Like John stated, is the impeller rubbing against the case itself? The impeller itself is not bolted to the shaft. I had the front drive shaft that was bad make that noise a couple years ago and I also had the PTO drive shaft also go bad especially the way the 738 shaft seems a little short and wobbles on the spline end, It's not on by much. The bearings were good but the female part of drive shaft had worn pretty bad, vibrated the entire tractor.
Franks post is important too. They have to be phased correctly, and u-joints are a common problem and easily tested.
What happens when you lift the blower up while it's engaged?
When you think of it, there aren't many items involved with a snow blower. I hope your gear box isn't bad, $$$$ and you're taking it all apart yet again to boot. The good part,, Only 12 bolts to take off (14 if you take the hanger arm completely off) and nothing left inside the case! 30 minutes and stripped clean...
Good luck and please let us know what you discover.. Did you change the auger bearings? :rolleyes:
 

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my post here was confusing. The shear bolt is the only thing keeping the impeller attached to the drive chain and the augers. Correct?

If the impeller was bolted to the shaft. That would defeat the shear bolt system.
Ill inspect the drive shaft / u joint connection next.
the impeller is connected by a shear bolt but the shaft will still power the auger regardless.
 

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Did you forget the bushing reference number 24 that fits behind the impeller when you did the enclosed chain case upgrade?
View attachment 821750
With the newer chain case that part is not required in fact if you did put it on (if you even could) the impeller would hit the font of the case.. The output shaft is already the correct length without the spacer or bushing.
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Riddle me this the bushing belongs there according to the parts diagram with the enclosed chain case.
It depends. :) There were TWO versions of the enclosed chain case. An earlier part number (AUC11644) with a flush front drive collar and a later part number (AUC16953) with an extended drive collar. The earlier version needed the bushing to take up the space between the impeller and the drive collar. The later version does not. The part number was revised rather quickly so I doubt there are many of AUC11644 out there. The parts illustration could definitely be a bit clearer on the use of the bushing.

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It depends. :) There were TWO versions of the enclosed chain case. An earlier part number (AUC11644) with a flush front drive collar and a later part number (AUC16953) with an extended drive collar. The earlier version needed the bushing to take up the space between the impeller and the drive collar. The later version does not. The part number was revised rather quickly so I doubt there are many of AUC11644 out there. The parts illustration could definitely be a bit clearer on the use of the bushing.

View attachment 821764
Well when I switched my 47 blower over to the Agrimetal impeller mine has the bushing and I bought this blower new in summer 2018 didn’t realized they made a change on the enclosed chain case. Thought maybe the OP was missing that bushing and impeller was rubbing against the blower housing.
 

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Discussion Starter · #14 ·
I really appreciate all the help guys. Amazing resource of knowledge!!
Ford mechanic friend helped me trouble shoot. We disconnect all shear bolts. U joint, new auger bearings and it was Still making the loud bang. We pulled the augers and the side plate off the gear box. Unfortunately the pinion gear is shredded along with three teeth on the main gear.
We are capable of rebuilding but too many hours in it already.
Any Suggestions on where to obtain a new or rebuilt gear box, with pinion, bearings and seals, would be helpful. 47” DE18720 \ 2009 - Serial number 212780.

Dam this has been quite a project. Blower gears Lasted 13 Michigan winters with a 500 yard asphalt driveway. Guessing 6-8 different shear bolt Episode did not help over the years.
 

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not cheap, around 550-600 bucks new. Green farm parts, mutton,, I would try a local JD dealer first and see. You've got enough new parts and $$$ into your blower to stop now..
 

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not cheap, around 550-600 bucks new. Green farm parts, mutton,, I would try a local JD dealer first and see. You've got enough new parts and $$$ into your blower to stop now..
Wow, replacement bevel gearboxes were around $900 when I bought my blower back in 2012. Then the price came down to around $400-ish at some point. Now I see the price is back up to $734.

GFP is currently running a big sale where you can get it for $653.
 

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I don’t know if it’s still running but GFP had a sale going this past week. Discount code was “hugesale.” I think the discount was ~12-15%. Minimum order required. Maybe $100 If I recall. I stocked up.


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Wow, replacement bevel gearboxes were around $900 when I bought my blower back in 2012. Then the price came down to around $400-ish at some point. Now I see the price is back up to $734.

GFP is currently running a big sale where you can get it for $653.
yup, you are right, I just saw a little over 6 bills at GFP because of the sale SGS just posted.. It's a racket John, but they know you need that part so......
His lasted quite a long time with breaking shear pins like he did,, He must have put a good one in the last time it went...
I thought the gear boxes were actually higher than they are..
 
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Discussion Starter · #19 ·
First gear and bearing replacement for this blower. I’m very careful about sticks and limbs, as the asphalt driveway snakes thru the woods back to the house. There are always trees that shed larger limbs that hide under the snow. I only use JD shear Bolts.
The new gear drive is installed with the new enclosed chain. Much quieter and smooth running.

I have one more favor to ask of the experts.
JD changed the gear drive part #, which was not a problem, easy to cross reference. But the top bracket that attaches the gear drive to the underside of the blower housing has also changed. The old bracket mounts different than the original to the gear drive housing. It’s on the side now instead of on top of the gear case.
I now need the part number for the new bracket. Easier than fabricating new or modifying the old.
 

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Is #33 what you are referring to? JD Parts seems to indicate this is the older style bracket and that #32 is the newer style. In any event, both part numbers are shown below.

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