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Old 08-20-2018, 01:53 PM   #1
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Slide Shear Pin Details

After breaking a shear pin on a slide I searched around for the proper pins for a few extras, just in case, and per Chuck’s suggestion. I could find the size, 5/16” X 1.5” without any problem. However, it was a bit more of an issue to find them with the proper hardness. I was told by Entegra that I needed a grade 5 hardness. Every place I looked did not have a hardness stated, but instead, had a grade of steel, low carbon, alloy, etc. Many of the companies that handle the Clevis pins (also known as shear pins) couldn’t answer the hardness question so I did a bit of research to find out what I could.

Apparently the hardness we need can be found in medium carbon grade steel. I’m getting a quote on a bunch of them and I’ll let you know what I find out.
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Old 08-20-2018, 06:57 PM   #2
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Shear pin

If you are really worried about hardness put grade 8 nut and bolt, does same job
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Old 08-20-2018, 09:02 PM   #3
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Ed, ...a shear pin will do what it is designed to do under a load, break. I wouldn't worry about the number as much as why it sheared to begin with. A softer pin will shear before a harder pin, both will still shear before any damage is done. I purchased medium grade off the shelf at Ace and would not have a problem using one if needed. Main thing is to have spares so as not to be stranded with a slide that won't move. Then find the reason the pin sheared.
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Old 08-20-2018, 09:06 PM   #4
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If you are really worried about hardness put grade 8 nut and bolt, does same job
I am aware that I can go harder, but I am also aware that shear pins are there for a reason. I’ve replaced enough of them on my John Deere tractor snow blower to completely understand their purpose. If it is a choice between replacing a pin for a few dollars or having to replace a slide motor, I’ll opt for the pins.

As the father of two engineers I’m well aware of the training they go through to try to make things work right. If the engineers say that a Grade 5 hardness is required then I feel that is what I should be seeking.

In the profession of tax work we have a saying, “Pigs get fat and hogs get slaughtered. Be a little piggie, not a great big hog.” For us that means that we need to comply with the law but we do have some leeway in interpretation. Engineering is not quite as forgiving in leeway in interpretation.
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Old 08-23-2018, 09:39 AM   #5
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I am aware that I can go harder, but I am also aware that shear pins are there for a reason. I’ve replaced enough of them on my John Deere tractor snow blower to completely understand their purpose. If it is a choice between replacing a pin for a few dollars or having to replace a slide motor, I’ll opt for the pins.

As the father of two engineers I’m well aware of the training they go through to try to make things work right. If the engineers say that a Grade 5 hardness is required then I feel that is what I should be seeking.

In the profession of tax work we have a saying, “Pigs get fat and hogs get slaughtered. Be a little piggie, not a great big hog.” For us that means that we need to comply with the law but we do have some leeway in interpretation. Engineering is not quite as forgiving in leeway in interpretation.



As an engineer I can tell you that if a shear pin goes regardless of what caused it you have a problem......and you may need to circumvent it to move the coach. A bolt, a nail, a grade 3 or 5 or 8 bolt or any clevis pin is going to be essential to start the process. Quit obsessing over the hardness of whatever you put in there temporarily to get the slide moving and the coach in motion.

The fact that the shear pin failed means the "engineers" on the system overlooked some failure mode because the pin shouldn't have to fail anyway so their help or decision on harness is questionable in any case. No system should be designed to shear the pin so you are re-engineering the system if one fails in any case. You just became the new engineer on the job......probably the first one to really look at it because the last guy did it that way because "that is always the way we do it...."


The shear pins I have looked at on our coach show pretty heavy wear and fretting from normal use so I replace them with whatever shear pin is available to avoid failure from a surface defect causing a fatigue failure later on. And I keep grade 8 bolts and nuts as well as some shear pins from ACE on hand for an emergency. And some common sense.
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Old 08-23-2018, 09:55 AM   #6
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Slide Shear Pin Details

Are these "shear pins" actually shear pins or have they become shear pins by default? Does Entegra actually call them shear pins or are they just the weak link in the system? My drive cog broke on the bed slide but the pin did not shear. Just curious.

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Old 08-23-2018, 10:22 AM   #7
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Are these "shear pins" actually shear pins or have they become shear pins by default? Does Entegra actually call them shear pins or are they just the weak link in the system? My drive cog broke on the bed slide but the pin did not shear. Just curious.

Richard

yes
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Old 08-23-2018, 11:14 AM   #8
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Well said Al. I have had the same slide system on two coaches totaling 15 years. I carry spare pins for emergencies but thankfully never had to use one. Why it sheared would be my main concern.
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Old 08-23-2018, 11:51 AM   #9
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My guess is that even though I followed the stated procedure of slides out, then level, I was on a slope and it torqued the slide enough to break one pin.

I'm kind of becoming an expert on shear pins and their hardness. I chatted with Lippert and I was surprised when they said that I could go harder, Grade 8, without damaging anything. I'm going to check the broken pin when I get home tonight to see how many slashes are on the head of the pin. That provides the indication of the hardness of the pins. Without looking I've got a hunch the pins being used are actually a Grade 2. Finding a Grade 5 or 8 hardness pin is about equal to finding an RV without any issues whatsoever.

My "obsession" over the hardness is only due to not wanting to be in a position where I'm hung up somewhere with a slide out because I have used a pin (and yes, Entegra does call them shear pins) that was too hard and I caused either the gear box or the motors to fail.

I did find the proper length and strength bolt and used that for the time being. Just in case I also bought a spare.
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Old 08-24-2018, 10:47 AM   #10
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Funny, I'm one a few owners who had their rod shear, while the shear pin remained intact. It occurred at the factory while rebuilding my main LR slide out (DS) and they had to drive hours to obtain a replacement rod. Be careful not to use a pin harder than the one specified. There's about a 1,500 lb difference between a Grade 5 and Grade 8. See chart.
Happy travels. JimClick image for larger version

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Old 08-24-2018, 09:24 PM   #11
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Funny, I'm one a few owners who had their rod shear, while the shear pin remained intact. It occurred at the factory while rebuilding my main LR slide out (DS) and they had to drive hours to obtain a replacement rod. Be careful not to use a pin harder than the one specified. There's about a 1,500 lb difference between a Grade 5 and Grade 8. See chart.
Happy travels. JimAttachment 216209

Jim, was the shear pin that didn't shear the factory one or a replacement that was harder?


if the factory shear pin did not shear in this case then my opinion remains the same. If the rod broke because of a harder replacement pin then what was wrong that caused the rod to break because the implication that the shear pin would have protected it is somewhat flawed as the system should handle the load without breaking the pin or the rod in either case.
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