Removing Blades from Rotary Cutter
- Thread starter trook
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twoone
Silver Member
HI" GW,
Should say neighbor: My problem was my arms were not long enough to reach around also I did not have a 450# torque wrench and tried to apply the same torque putting it on as taking it off. I must say that every time I use the machine I wonder about it. yes included in my tool shop is my favorite cheater bar and best tool investment. take care, Paul
Should say neighbor: My problem was my arms were not long enough to reach around also I did not have a 450# torque wrench and tried to apply the same torque putting it on as taking it off. I must say that every time I use the machine I wonder about it. yes included in my tool shop is my favorite cheater bar and best tool investment. take care, Paul
clemsonfor
Super Member
When i went to change my lower seal a few months ago, i used my fingers to remove mine!!! 
I dont remember what i put them on with, did not get close to 450 im sure, but thats not how tight they were adn i will just recheck them frequetly.
I dont remember what i put them on with, did not get close to 450 im sure, but thats not how tight they were adn i will just recheck them frequetly.twoone
Silver Member
Gee I wonder what they were when you removed them bet you did not take them off with your finger's or did you? I hate to think about that thing coming loose or? werling around like it does. Come's a thought how fast are the blades spinning? all we know is that the pto is turning at 540rpm. Paul
clemsonfor
Super Member
They were finger loose!!!!! Thanks to my dealer "prep" assembly. I still needed a wrench as the grit on the threads was to much to overcome with fingers and all the lube on there from the bad seal.
I think most under 40 hp gear boxes are 1:1.7 ratio, so you can figure it out. If your turning 540 at the shaft that means the blades are 915ish RPM. Which base upon blade diameter and some calculations you can figure blade speed, but im to lazy to do all that.
twoone
Silver Member
You know am not to sure but being so loose there must have been a lot of vibration to the gear case and that probably caused the seal to go. I would have been down the dealers throat and really give him a piece of my mind and have him rebuild the gear case. Things being as they are there must be a lot of accesseve wear on the shoulder bolts as well. seems the whole thing will take a beating the way it is, If the dealer wont back you up I'ed clean up the bolts or replace them if necessary and make sure there tight . Like I said that's a lot of steel werling around. Paul
gwdixon
Elite Member
I have a 1/2" impact wrench and the 1 1/2 socket, but the wrench is only rated for about 250lbs. I'm afraid this will not be enough
If the impact wrench will take off the nut you should be OK putting it back on. Just let the wrench rattle on the nut for 15 seconds or so.
That should cycle your compressor also. Then hit the nut with the compressor fully charged. Also, be sure to oil your impact wrench right before using it on the nut. That will get the most out of your wrench.
gwdixon
Elite Member
The blade tips are going from 15,000 to 18,000 fpm. That is 170 to 200 mph. It also depends on the length of the cutter blades and the gearbox gear ratio.
These numbers are from the Landpride RCR2596 owner's manual and a Howse 8' mower that was researched just a short time ago. The Landpride has dual 4' blades w/3 gearboxes while the Howse had a single (well, actually two) blades.
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twoone
Silver Member
Hi" Gw,
I was referring#13&15 to clemsonfor he took the nuts off with his fingers. Thanks for math I was afraid before but now I know why. Paul
I was referring#13&15 to clemsonfor he took the nuts off with his fingers. Thanks for math I was afraid before but now I know why. Paul
hidden hollow
New member
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- May 24, 2011
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- Tractor
- john deere
Some of these responses worry me. I understand trying to sharpen the blades while they are on the brush hog but if the blades are in anyway seized up and they don't swing easily on their bolts you will not get a good cut and you will be taking a chance on not having your mower continue working. If you hit something with seized blades all the impact of the hit is transferred to the gear box and then to the clutch on the mower. If the clutch is not set correctly and checked at the least every season all that impact also goes to your PTO. So please make sure that you blades swing freely and that they are sharp. Sharpe blades cut with less strain on the tractor to say nothing of leaving a clean cut. I take my blades off every time they need to be sharpened. Before they go back on the mower, I balance them so that I get a smooth running mower. Another thing that I always check is the fluid in the gear case. If it has any white color to it there is water in there. I have seen a lot of tractor implements that the dealer leaves out in the weather prior to selling them. They get sold and then they are returned because the gear case gave up the ghost. It was full of water. I guess from snow and ice freezing and thawing around the breather hole in the gear case.