54 mmm blade removal question...!

tpeachey · Apr 26, 2013

I am replacing the blades on a 54 inch mmm under a Kubota BX 1860 and need the socket size to remove the current blades. Any other advice or tips would help. Thanks in advance...

TripleR · Apr 26, 2013

I am not sure about the BX1860, but the BX2660 takes a 30 mm socket. I use an impact driver to remove them, but if you don't you can use a piece of 2x4 to block and hold the blades. On the outside blades, I have also held the nut on the pulley on the top side while loosening the blade bolt. Be sure to replace the cupped washers like they came off.

I torque them to 75-80 foot pounds.

Kenonf · Apr 26, 2013

The blade bolts are reverse thread on my RC60-71B mid mount mower, I am not sure about yours, just wanted to give you a heads up. And there is a blade orientation diagram in your mid mount mower manual, yes it does matter how the blades are In orientation to each other.
Ken

oldnslo · Apr 26, 2013

My BX1850 was also 30mm and where standard right hand thread. Huge head on the bolt but smallish threads. I would guess 12mm so like tripleR said, easy on the torque when tightening them.

bellweather · Apr 26, 2013

Kenonf,
I have the 54" MMM and there is no orientation from blade to blade, which to me makes sense since they are all driven by a single belt (without timing teeth)? My mower must be different from yours. Also, I don't recall reverse threads on the bolts, but I will check the manual so thanks for the heads up.

Danner · Apr 26, 2013

TripleR said:
I am not sure about the BX1860, but the BX2660 takes a 30 mm socket. I use an impact driver to remove them, but if you don't you can use a piece of 2x4 to block and hold the blades. On the outside blades, I have also held the nut on the pulley on the top side while loosening the blade bolt. Be sure to replace the cupped washers like they came off.

I torque them to 75-80 foot pounds.

I cam here to post this.

You can get an electric impact wrench at Harbor Freight that will do the job.