[AT] Adventures with shear pins

[Ernst Borchert]

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.
_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at


---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com