47 blower problem possibly solved?

saselker · Feb 17, 2007

the key that was worn on mine was in the gearbox but it is not necessary to actually open it up to replace it. I removed the left and right augers from the shaft than slid the shaft out of the gearbox. The worn key will be in the shaft where the gearbox was. There is actually a hollow hub that the bearings and gears ride on...the shaft fits into that. Now there is another key that holds the gear to the hub but in my case that was not worn, I would check it though you will be able to tell if there is any "slop". Take a look in jdparts.com, the diagrams are pretty good showing the keys and such.

I am of the opinion that the keys wear due to the hammering these things take from the driveline(accel decel 4x times a revolution). The only real cure would to correct that. Just for kicks do a search on ebay for "deere 47" you'll find some listings for the earlier style 47 blowers-in the pictures you'll see the different style hitch these use. Notice how they use parrallel links to keep the blower (and impeller shaft) horizontal at all times. this keeps the driveline angles the same at both ends of the short shaft eliminating the accel decel hammering...this is not the case with the new style quick hitch...so much for the "improvement" I myself will be investigating the possibility of using a constant velocity joint at the machine end of the driveshaft or alternativly fabricating a new hitch that functions like the old style. My machine is quiet now but it is only a matter of time before the keys wear again. I don't believe JD will be adressing this any time soon as that would require them to admit they made a blatent design error.
All that being said I am still very happy with it overall and would not trade it for one of those belt drive arrangements. Like you I am a bit over the top when it comes to making things right.

Labrat · Feb 18, 2007

My tractor was in the shop twice for the noise and vibration in the blower in early 04. They replaced several parts including the mid shaft and the front gearbox. The dealer said there was nothing more they could do. Now in 07 it appears they are no closer to a resolution. The deflection in the mid pto shaft aggravates me as much as the positive/negative torque pulsations as saselker posted.
As much as I like the tractor I will probably send it packing before it starts horking up parts and costing major $$$$ in repairs.
Luckily the farm show is this week. I will be looking at trading my machine.
I’m really starting to take a shine to one of those red 2415’s. The rep at the tractor show last year told me they will be available with a front blower and Curtis is making cabs for them.

turbo36 · Feb 25, 2007

All this discussion on this motivated me to take a look at my 47" blower. I got it just over a year ago and noticed it made a lot more noise the my 455 with the same model blower. I made a call to my dealer and got the explanation "that because of the more severe angle on the 2305 the blower will make more noise" so I figured a set of ear plugs would solve the problem. Well after a year of this the thing was driving me nuts so I pulled the blower off to take a look at the chain and such to see if there was any obvious problems. One quick tug on the big sprocket gave me my answer; it was completely loose and just floating on the shaft, the set screws were loctited in place so they gave the impression the were tight against the shaft but they weren't. Upon further investigation I discovered the internal bore on the sprocket was so much larger then the shaft the sprocket would wobble .
The tractor went back to the dealer and they put on a new sprocket and key, alsothey greased and adjusted the chain ( apparently they run quieter with a little slop). Now it is amazingly quiet!!! I wish I had forced the issue while it was under warranty.

I would advise everyone that has noise to check for play in the big sprocket.

Shawk · Feb 26, 2007

Ran the blower on my 2305 and it was as quite as my 2520/47" blower. Everything was aligned as recommended in another thead, greased really well and the machine was even quieter than I thought it was... wacky alignment requirement... but all is well

Labrat · Feb 26, 2007

At the end of winter I plan on having the mid driveshaft cut and a carrier bearing installed. If that doesn't work I may replace the drive chain with a gear belt.

Nothing is loose or lacking grease on my unit. you can tell by the gobs it leaves on the garage floor.

As I couldn't put a deal together at the farm show I will have to keep this tractor until they make a blower as wide as the 2320.

rlcowder · Feb 28, 2007

Well the dealer and I went over the whole thing and cannot find anything out of whack. He put the blower on a 595 and it ran quite. On a 2035 same noise. The final determination is that the angle of the shafts is not the best design and that is when the noise is comming from and then it is magnified in the blower. I give up. If I can I will sell the blower to someone who wants to mount it on machine other than a 2305 or 2210. It ran perfect on the X series. I just can't stand the noise so I won't be using it again. There goes $$$$ down the drain.