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Brush Hog Mower Question

F

fusion1

Member
A few weeks ago I was mowing with my 6' mower and the lower plate that the blades mount
came off,
I had to order a new castle Nut, I inspected the splines on the plate and the output shaft and all looked good, reinstalled the plate and castle nut with a new cotter pin
mower seemed to work good 3-4 acres of mowing , yesterday it did same thing again
any ideas what is going on here.
 

Assuming you've the proper thick lock washer, you have to torque to least 250#. My old Bush Hog (brand name, no copy) wants 250 on that nut. Holding it is the creative part of the problem. Larry
 
Had a similar problem with my neighbors cutter a few years back.its usually either the nut or shaft threads that might look ok but have some wear.short term fix was pipe thread tape on the shaft threads to tighten everything up.dont know if the shaft can be machined and threaded for a smaller diameter nut or better to replace it
 
You maybe should of stopped after the first acre and re-torqued the nut. I recently installed new blades on our Bush Hog, and those nuts are torqued to 600 foot pounds, I suspect the center nut is somewhat more. I greased the bolts well and tightened them, and after 30 minutes checked them, and they were fine. I use a 3/4 ratchet/socket and a 3 foot pipe. It's an educated guess, I have been working on machinery for about 60 years.
 
No lock washer on it , the new castle nut has a flat washer on it
and I use the cotter pin to secure
I will try a new nut and after running it for 30 min 0r so will recheck the torq.
 

Best to check your operator's manual, if you have, or can find, one. Enough torque is critIcal to hold the blade bar to the gearbox shaft especially it it is a taper fit. Multiple checks would be advisable.
 
Any time a hub and shaft are run loose there is a measure of wear, it may not look worn, but it is likely no longer in spec.

Cleaning the grease and rust off, then applying some blue or red Loctite will help. Also torque the nut to spec and never back off to align the cotter pin hole. If the hole is directly covered with the castle, either take it tighter or put a different thickness hardened washer under to get the hole to align.
 
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