I wonder if they replaced the gearbox with the parallel one and the blower drive input is going the wrong way. When I got a used 47, I had to buy a shaft reverser instead of a $700 main gearbox replacement. Just check the auger rotation direction. You can do this by hand with the engine off.
JD 47-inch blower problems
- Thread starter Z71
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oldnslo
Super Member
In looking at the JD parts website it looks like the sprockets would be two very different sizes but it also does not show the tooth count. I did not see more than one set of sprockets listed but possible dealer the incorrect units.
Does the fan seem to throw the snow OK or does it also seem weak?
Good luck is resolving this issue
Does the fan seem to throw the snow OK or does it also seem weak?
Good luck is resolving this issue
How about this global warming theory: They left the shaft key out of the chain sprocket drive shaft. With light snow or none at all, the set screw for the sprocket can roll the auger and fan, but under load, the sprocket slips and you now have a snow pusher.
It does blow but compared to my neighbors machine not as fast and as far, his machine does not leave a bank of snow in front. Going to run a sidexside test tomorrow to Don's machine, has same HP tractor and same blower, just 5 yrs newer model and his has never needed auger rebuild.
A local guy (owns a JD tractor) who works on tractors mentioned maybe a governor that controls the pto speed? Is there such a thing?
The bill, looks like he used JD parts or at least charged me for JD parts
Part numbers jive with JD Parts listing and pics for a 47" blower. Hard to mix up speed ratio with any parts. I see there are 3 drive pins (fan and 2 on the auger that need to be in place to turn all the rotary pieces. If engine speed is correct, fan and auger would be at the proper rpm with no load. If loaded and there is slippage of some form (as in missing shaft key) then the drive system would slow down or halt. A video shot from the front would tell it all. Can't wait to see the comparison results !
oldnslo
Super Member
100% agree with zzz that something is slipping causing the blower to slow down. Question is what is slipping, something on the input drive to the blower or something on the blower itself.
Take a video or have someone watch both the infeed auger and blower fan while pushing into a pile of snow.
Take a video or have someone watch both the infeed auger and blower fan while pushing into a pile of snow.
