Posted by Billy NY on July 07, 2014 at 16:59:45 from (66.67.105.23):
In Reply to: shear pins posted by Nick167 on July 07, 2014 at 07:19:41:
You many want to consider that, this is one of the more abusive pto driven implements you can attach to a tractor. Depending on the conditions, what you will be cutting, and or the hidden, unforseen rocks, objects or the worst case scenario, any stumps and all the rest, that it either slips properly via a slip clutch or it shears when it needs to. I saw a very expensive repair with a JD 2020 last year, which I now suspect was an unknown, possibly grade 5 or 8 in the driveline of this old but really heavy duty rotary mower, it destroyed the shaft coupler, and it was a split and complete tear down, for a very inexpensive bolt, pin or slip clutch.
My old Rhino has a shear pin hole in the drive line and I use shoulder bolts with left hand thread that shear, which have nylon line nuts, these will shear before a grade 2 bolt will in the drive line, it will lay both blades down under the deck, with the remains of the hardware, last time it was a hard round rock, that surfaced the last time the field was in crops. The blades are connected to a blade holder that has as stump pan, no doubt those pans can help reduce some impact. I ran a tail wheel through this mower, and though I did slow it down quickly, the grade 2 nor the blade bolts sheared, it did a lot of damage to the deck, another 50 cent pin, that failed, cost a lot more in repairs, should have been replaced, it got past me, new tail wheel, and a bunch of labor to straighten the sidewall of the mower and a bunch of miscellaneous welding to the deck, caught some welds on the blade holder that would have failed, wish that grade 2 or blade bolts sheared that time! Not to mention if it was paying job the down time over a darned 50 cent pin.
I've taken saplings and heavier brush/bushes, starting up high and lowering into them in the succeeding passes, in 12 years with this mower, I have sheared that grade 2 bolt one time as I recall, it does fit nicely too, no slop. I think the best advice is to play it safe, they can do some damage in short order per the above. If you are dealing with a lot of conditions where it will impact and shock load the drive line, don't have a stump pan, I'd seriously consider a slip clutch, make sure it works correctly or get a pile of grade 2's to keep on hand, at over 3K in repairs like the above, and or depending on what you have for a tractor, something to consider, that buys a lot of bolts/pins and or slip clutches.
Another thing, depending on what you are running for a mower, with so many different kinds out there, the book for it may provide the specifications of what should be used anyway, one page in the book for mine certainly helped me avoid a lot of problems, as well as making it perform as designed etc.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
