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Thread: Slasher cutter bar LH nut
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27th May 2011, 09:47 PM #1
Slasher cutter bar LH nut
We are re furbing an offset slasher ( it sticks out a couple of feet past the tractors tires ) here at school.It sported a Morse 40 HP gearbox.It was disassembled to allow measurement and repair.
Naturally because I placed the bits in a big tin for safe keeping,some cherub has played with them and relocated /lost ( having nothing better to do) some things are now missing.
The most critical part. Its a 1"UNS 14 TPI LEFT hand castellated nut.
I am thinking a certain cherub needs to be castellated!
If I can't buy one a new one shall need to be made and its ooking likely. Can those in know tell me will a bit of Cold Rolled hex be ok to use to machine our thread . I am thinking
1 3/4 " AF hex .
I ask this, as the nut holds the splined assembly for the slasher cutter bar in place. Will cold rolled do or is the nut being made for a slasher , a very special goodie?
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27th May 2011, 10:05 PM #2Dave J Guest
I think it will be fine with it being splined as well.
Dave
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28th May 2011, 03:44 AM #3Turning useful pieces of steel into scrap metal.
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Are you sure it is a left hand thread as these slasher gearbox out-put shafts usually have a conventional right hand thread?
Turning useful pieces of steel into scrap metal.
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28th May 2011, 07:43 AM #4Most Valued Member
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Unless you need the Nut to be a specific A/F size standard nuts are 1 1/2" and a touch over 1" long.
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28th May 2011, 08:16 AM #5
When I rang the fasteners crowd the bloke said that from his memory the nut was a touch bigger than normal because of the castellations.It was he that suggested that it was around the 1 3/4" AF mark.
The bloke that owns the slasher told it was a left hand nut and not to lose it it ( after I found it was missing).
However in possession of this new snippet of info, I will be sure to go back and double check the thread.
Grahame
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28th May 2011, 08:49 AM #6Most Valued Member
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!" uns x 14 might not be correct it could possably 1" x 14 UNF.
As you have the spline it wont be hard to tell by just looking if its UNS or UNF,there is the chance that the nut may of been Slotted rather than Castellated,if that was the case the A/F is still the same but the Height/Thickness will be different the slotted is a touch under 7/8".
Realy it wouldnt matter very much what Dimensions you use as long as it does the job.Last edited by pipeclay; 28th May 2011 at 08:58 AM. Reason: More info
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28th May 2011, 10:20 AM #7
The intention is in the event of a replacement being unobtanium, I will revert to plan B and make one, but only if I have to .
The concern for me is that the base material of the ( cold rolled steel ?) hex bar of correct AF for the job is of the correct quality and won't fail under the extreme use it will undoubtedly receive.
I have found a parts source for slashers in WA ( AGPARTS ) and found the parts breakdown for what looks very much like this gearbox .It does not indicate that the nut is Left hand but surely is 1" x 14 TPI.
On the Sutton pocket card I have the listing for UNS occurs in the UNF table and only one and one diam & pitch entry only (guess which one it is?) is referenced at the bottom of the table and listed as UNS
I will contact Agparts for more info on Monday.If indeed my checking on Monday reveals our slasher is only a right hand thread ,then I am home and hosed.
I intend to fit the split pin through the constellation so there is a snug tit and Loctite it give it absolutely no opportunity to misbehave.
Given how dangerous these units can be I am cognisant of inherent responsibilities in the repair of the unit.
I will take some photos and post them when I get a moment to scratch myself.
Cheers
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28th May 2011, 12:32 PM #8Turning useful pieces of steel into scrap metal.
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As I stated previously, these output shaft threads are usually right handers. There is no advantage in being a left hand thread, it would cost more to produce. Double check the thread and just don't rely on the word of someone that may not even know what a left hand thread looks like.
Turning useful pieces of steel into scrap metal.
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28th May 2011, 12:40 PM #9
Graham, if it's 1"UNS, Caterpillar use that size on their pulling gear.
Most workshops I have worked in had a ready supply of nuts, taps etc. to suit that size.
Unlikely that you would find lh threads in the pulling gear though, so might'nt be of much help.
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28th May 2011, 02:44 PM #10logic
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In that case you will need a left hand UNF Tap. Not easy to find.
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28th May 2011, 08:35 PM #11
Hi Guys,
Given what was said about the nut more likely being a right hand jobbie I have proceeded to the local fastener outlet and have obtained a
RH 1" x14t pi nut.
Its not castellated but I can fix that. When Monday comes around we shall see.
Until then thanks for all the help .
Grahame
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28th May 2011, 08:43 PM #12
Does the shaft have a key-way cut into it, if so you can use two nuts with a tabbed washer between them, plenty of those used on slashers.
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28th May 2011, 09:18 PM #13
No key way but there is a splined shaft (guessing 1.5 " ) which then tapers down to the thread section.
The splined female hub is welded to the cutter bar frame .The blades pivot or flail of the opposite ends of this bar.
Grahame
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29th May 2011, 09:42 AM #14Pink 10EE owner
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Grahame if it is a 1" 14 nut I have a tap here that size I could post to you if you needed to make a new nut..
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29th May 2011, 11:52 AM #15
Thank you RC
I take it your tap is R hand.
Thank you very much for your offer.
I'll know more tomorrow.
I obtained a new R hand nut 1" x 14TPI on Saturday morning.Nearly everyone whom I have talked to and has any has experience with slashers are saying that the out put shaft nut is a Rh and they never heard of a LH nut used there especially with a castellated nut and split pin.
I only assumed a LH thread cos that,s what the owner said to me .
"Don't lose the nut as it is left hand "he said ,and that was after I went looking for it and found that the marked tin ( slasher parts) I had the bits in.All that was left was the empty tin.
Possibly some little cherub from another class has probably grabbed it and maybe welded it to some thing and then dumped it in the scrap would be my guess.I don't think my kids would have touched it as they now have a sense of ownership and pride in their own project.
I will test fit the nut on Monday and we will see what the result is.
Am hoping like blazes that the thread is indeed a RH.
I want to get the slasher out of my shop as its been there 2 months now.
In the mean time an odd snap of gearbox mount plate to boxed angle section before the 6mm deck plate goes on.I have suggested the owner to dice his old fergie tractor and get a bulldozer as that's what he will need to hump it around.
Grahame