[AT] Adventures with shear pins

Herb Metz metz-h.b at comcast.net
Sun Jul 27 10:05:02 PDT 2014


I pull a 6' single spindle bush hog with single 2' arm welded to the spindle 
with pivoting 2' cutter arms on each end.
I bought it slightly used; previous owner did not notice gearbox leak and it 
self destructed.  They replaced with 100 HP gearbox; more than adequate for 
my D-14 Allis. I tested slip clutch initially; need to check again (five 
years later). Have hit many rocks, but nothing fixed.
I prefer the mower that is a bit too big for the tractor, as I can always 
change gears or take a partially swath.
Herb


-----Original Message----- 
From: Mike
Sent: Sunday, July 27, 2014 12:26 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Adventures with shear pins

If run grade 2 shear bolts with my John Deere rotary mower I will
replace at least 2 every time I mow, changed to grade 5 and the problem
went away. I don't have a manual for it since I bought it at an auction,
so I don't know what JD recommends. As to Ralph's point I changed to
ny-lock nuts to keep them from coming loose.

Mike M

On 7/27/2014 11:58 AM, Ernst Borchert wrote:
> Good morning, I pull a 6' Howe trailer rotary cutter behind my Allis
> Chalmers WD 45 to cut heavy brush and when I hit something heavy either 
> the
> 1/2 bolt on the mower or the Allis shears. I have been running this
> combination for ten years without any damage to the mower or tractor. I 
> use
> #8 bolts from TSC.
> Have a great week
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Ralph Goff
> Sent: Sunday, July 27, 2014 10:46 AM
> To: Antique tractor email discussion group
> Subject: Re: [AT] Adventures with shear pins
>
> On 7/27/2014 8:07 AM, charlie hill wrote:
>> I've been through a few other brush cutters since that one and I have
>> never yet had a sheer bolt to sheer when I hit something regardless of
>> having a slip clutch or not.  In fact I've hit stuff so hard with that
>> old
>> D-10
>> that with the engine running at wide open throttle it shut off dead in
>> it's tracks,  Sheer pin never budged.  Not even the brass ones.
>>
>> The best thing I've found is the slip clutch but they didn't have them
>> back in the
>> old days or at least I didn't know about them until the 80's.   The only
>> trouble
>> with slip clutches is that if you set them loose enough to do any good
>> they tend to slip when you don't want them too.  It gets down to how
>> much risk to your equipment you are willing to absorb in order to get
>> maximum production.
>>
>> Charlie
>>
>>
> Sounds like your shear pin was working loose. We had that a lot on square
> balers. A new shear pin would seem to "stretch" and work itself loose 
> after
> a few bales. Finally we started using double lock nuts on the shear pin 
> and
> it did make a difference. Those balers just used a common 5/16 or was it 
> 3/8
> bolt. My newer NH 847 round baler takes a rather odd sized shear pin on 
> the
> gear box and I have not found a right sized substitute other than the
> original NH parts. Luckily it does not break many shear pins.
>
> Ralph in Sask.
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