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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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...............
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, $$$$ and you're taking it all apart yet again to boot. The good part,, Only 12 bolts to take off (14 if you take the hanger arm completely off) and nothing left inside the case! 30 minutes and stripped clean...
Good luck and please let us know what you discover.. Did you change the auger bearings?
Franks post is important too. They have to be phased correctly, and u-joints are a common problem and easily tested.
What happens when you lift the blower up while it's engaged?
When you think of it, there aren't many items involved with a snow blower. I hope your gear box isn't bad, $$$$ 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?
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.
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.
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.It depends.
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