snapped chain.....twice

[Sumpter]

I'll see if i can find some of fully threaded bolts and try them out. Good idea.

 

[MF RED in MT]

We have snapped the chain twice on the new blower. The shear bolts are Grade 5 - 5/16" which is recommended. Both times it has been a rock. I wonder it I need softer bolts or a stronger chain. My belief is that the bolt should shear before the chain breaks. The bolts broke the first time the chain broke but not the second time. Any suggestions?

Hey Sumpter, my vote is to go for softer rocks, :laughing:. What I do is pound my snow marker poles (about every ten to fifteen feet of so) into the ground before it snows so I can use them for guides, :thumbsup:. Just a dumb question, but are you at an idle RPM when you engage the snowblower, :confused2:. Hope you figure out your problem, :thumbsup:. KC

 

[Sumpter]

Hey Sumpter, my vote is to go for softer rocks, :laughing:. What I do is pound my snow marker poles (about every ten to fifteen feet of so) into the ground before it snows so I can use them for guides, :thumbsup:. Just a dumb question, but are you at an idle RPM when you engage the snowblower, :confused2:. Hope you figure out your problem, :thumbsup:. KC

Snow marker poles would be nice but not feasable. We plow about 5 miles a road, or I should say old forest service road that someone made into a 5 and 10 acres per lot subdivision years ago. The roads are barely better than primitive. So we have the blower as high as it will go and in float.
I do have the tractor at idle, engage and throttle up. :thumbsup:

 

[MF RED in MT]

Snow marker poles would be nice but not feasable. We plow about 5 miles a road, or I should say old forest service road that someone made into a 5 and 10 acres per lot subdivision years ago. The roads are barely better than primitive. So we have the blower as high as it will go and in float.
I do have the tractor at idle, engage and throttle up. :thumbsup:

Wow, I could only afford the snow markers for a 5 mile road if I placed them every 1/4 mile, but that would not help, . KC

 

[Sumpter]

Once the berms get bigger that will be my snow markers and all will be good here. Supposed to get another foot of snow today. :thumbsup:

 

[SPYDERLK]

I'll see if i can find some of fully threaded bolts and try them out. Good idea.

Buy a little long. Good for any inclusive length.

McMaster-Carr

 

[DemcoEd]

i would be concerned useing that style of bolt. The threads will eventually "cut" the hole and make for a sloppy fit. Once that happens you will be constantantly replacing bolts. Shear pin design protection requires a solid fit/tolerence meaning the bolt has to fit correctly in the hole. Once the whole gets sloppy the poor fit will make it impossible to have the shear pin hold the power it was meant too.

 

[SPYDERLK]

i would be concerned useing that style of bolt. The threads will eventually "cut" the hole and make for a sloppy fit. Once that happens you will be constantantly replacing bolts. Shear pin design protection requires a solid fit/tolerence meaning the bolt has to fit correctly in the hole. Once the whole gets sloppy the poor fit will make it impossible to have the shear pin hold the power it was meant too.

The hole should be harder than the bolt- otherwise the shear would smear the edges of the hole. Nevertheless all shear holes suffer over time. I dont tighten my bolts, leaving them free to turn a little in the hole. I agree. If the thread was always in the same place it would slowly wear threads into the hole.
larry

 

[TGReaper]

We have snapped the chain twice on the new blower. The shear bolts are Grade 5 - 5/16" which is recommended. Both times it has been a rock. I wonder it I need softer bolts or a stronger chain. My belief is that the bolt should shear before the chain breaks. The bolts broke the first time the chain broke but not the second time. Any suggestions?

I am having a real problem with this. I can not imagine a # 60 chain standing up to twin 5/16 shear bolts. There should be another system to protect the chain and auger.
When you find the problem please don't forget to let us know all the details.

Dan

 

[SPYDERLK]

I am having a real problem with this. I can not imagine a # 60 chain standing up to twin 5/16 shear bolts. There should be another system to protect the chain and auger.
When you find the problem please don't forget to let us know all the details.

Dan

It depends on how big the driven sprocket is. -- Anyway, catastrophic overload vanishingly seldom happens simultaneously at both shearpoints.
larry