Bush hog blades worn on back side.

[countrybumpkin]

Any chance you can post some pics of the blades?

 

[SPYDERLK]

If anything like large mower blades, the "non cutting," side has a twist up to create air movement. This slight bit of non horizontal blade surface is very susceptible to being sand or gravel blasted removing metal over time.

Dave M7040

Any chance you can post some pics of the blades?

My thought as well : Are these lift blades/twisted or just plain flat out at the cutting end?

 

[MossRoad]

You inherited the mower. Maybe the previous owner install the blades incorrectly for a while, then put them on correctly later on, but before you got it?

 

[SPYDERLK]

You inherited the mower. Maybe the previous owner install the blades incorrectly for a while, then put them on correctly later on, but before you got it?

Some cannot be turned over due to the design shape utilized to keep the cutting edge well below the stump jumper hub.

 

[BufordBoone]

I found one set of blades I believe had been used and one that I believe had not been used. This mower has two spindles so I need two sets of blades.

One photo shows a comparison of what I believe is an unused blade and a used blade.

The other photos show the tip of one of the blades that is still installed on the mower.

 

[mcfarmall]

If I was spending my own money...I wouldn't replace them. I'd run them until they looked like fillet knives.

 

[SPYDERLK]

I have a 3126 Bush Hog brand rotary mower. I inherited this mower with the farm.

I took a look at the blades today and believe they need to be replaced (thought that was likely before I looked).

Something I noticed that I don't understand: The back of the blades is worn down. What I mean by that is the opposite side from the cutting edge (as verified by rotation direction) is worn down.

Anyone have any idea what causes this? I don't find it in the owner's manual. My most probable explanation is operator error.

I found two blades I believe are new (well, old but never installed) and two that are obviously used...but not nearly as much as the ones on my cutter.

My cutter is a two-spindle, offset, semi-mount 10' version. I think I'll order 4 new blades but would like to know what caused this type of wear.

This forum has been great. Thanks.

I found one set of blades I believe had been used and one that I believe had not been used. This mower has two spindles so I need two sets of blades.

One photo shows a comparison of what I believe is an unused blade and a used blade.

The other photos show the tip of one of the blades that is still installed on the mower.

View attachment 547760View attachment 547761View attachment 547762

Your answer is in the thread.

 

[John Fitzgerald]

It's grit and sand wearing the lift side away. I have had the same thing happen to lawn mower blades. After several sharpenings on the cutting edge, the lift edge is worn badly and I get new blades. I would sharpen those rotary cutter blades and run them another season or two. Rotary cutters don't depend much on the lifting of the grass/brush by the curved back of the blades.

 

[BufordBoone]

Thanks for the replies. It makes perfect sense.

I really appreciate the folks on this forum.

 

[BufordBoone]

Update: My local dealer had new blades in stock. What I had were a couple of fairly worn blades, a couple of lightly worn blades and two sets of blades (on the mower) that are severely worn.

I'll trash the blades on the mower, sharpen the lightly worn blades and I picked up a couple of new blades.