They are small metal bolts that break on purpose. What are snow blower shear pins? They are a key safety part that protects your machine’s engine and gears from big damage.
If you own a snow blower, you will see these pins. They connect the auger to the main drive shaft. Their job is to be the weak link in the chain.
When the auger hits a rock or a chunk of ice, the pin snaps. This stops the force from reaching the engine. It’s a cheap part that saves you a lot of money.
I’ve broken many of these over the years. Let me explain everything you need to know about them. This guide will cover what they are, why they matter, and how to fix them.
What Are Snow Blower Shear Pins Exactly?
Let’s get into the details. What are snow blower shear pins in simple terms?
They look like regular bolts or pins. But they are made to break under a certain amount of force. You will find them on single-stage and two-stage snow blowers.
They sit on the auger shaft. One pin goes on each side of the machine. This design protects both the left and right auger.
When you ask, “what are snow blower shear pins?”, think of a fuse. A fuse in your house blows to save your electronics. A shear pin breaks to save your snow blower.
The Occupational Safety and Health Administration (OSHA) talks about machine guarding. Shear pins are a form of built-in safety for your equipment.
Without them, a sudden jolt could wreck your gearbox. It could even bend the auger itself. Replacing a pin costs a few dollars. Fixing a gearbox costs hundreds.
Why Do Snow Blowers Need Shear Pins?
Snow blowers deal with unpredictable stuff. You never know what’s under the snow.
A hidden rock, a garden hose, or a solid ice chunk can stop the auger fast. The spinning parts have a lot of momentum. Something has to give.
That’s where the shear pin comes in. It is designed to be the part that fails. It gives way before anything expensive does.
Think of it as a sacrifice. The pin breaks so your machine can live to fight another day. It’s a brilliant and simple bit of engineering.
I learned this the hard way. I once sheared a pin on a buried newspaper. It was annoying in the moment. But it saved me from a huge repair bill.
According to the Consumer Reports guide to outdoor power equipment, this is a common feature. It’s a standard safety measure on most snow blowers.
How to Know If Your Shear Pin is Broken
The signs are pretty clear. One side of your auger will not turn.
You will see snow throwing from one side only. The other side just sits there. The machine might also make a loud clunking sound.
Go look at the auger shaft. You will see a hole where the pin used to be. The pin itself might be sheared in half on the ground.
Sometimes, the broken piece stays in the hole. You might need a punch tool to get it out. Don’t try to run the machine with a broken pin.
You will just cause more damage. The auger will spin loosely on the shaft. This can wear out the parts and make new holes.
Always keep a few spare pins in your garage. You don’t want to be stuck in a storm. Knowing what are snow blower shear pins includes knowing how to spot a broken one.
Step-by-Step Guide to Replacing a Shear Pin
Replacing a pin is a simple job. You can do it yourself in about 15 minutes.
First, turn off the engine and pull the spark plug wire. Safety first. You don’t want the auger to spin while your hands are near it.
Find the hole in the auger and the matching hole in the drive shaft. You need to line them up perfectly. Sometimes you need to turn the auger by hand to get the holes to match.
Take your new shear pin. Slide it through the aligned holes. The pin should go in smoothly. If it doesn’t, the holes are not lined up right.
Next, secure the pin. Most models use a cotter pin or a hairpin clip on the end. Slide this through the small hole at the tip of the shear pin.
Bend the legs of the cotter pin apart so it can’t fall out. That’s it. You have now fixed your snow blower. Knowing what are snow blower shear pins means knowing how to put in a new one.
The Environmental Protection Agency (EPA) has tips for maintaining outdoor equipment. Proper upkeep, like replacing wear parts, helps your machine last longer.
Common Mistakes People Make With Shear Pins
I see people make the same errors every winter. The biggest one is using a regular bolt.
Never replace a shear pin with a standard hardware store bolt. A regular bolt is too strong. It won’t break when it should.
That force will travel into your gearbox. You will break something much more costly. Always use the correct shear pin for your model.
Another mistake is not checking both sides. Sometimes only one pin breaks. But you should check the other side while you’re at it.
People also forget to use the retaining clip. The shear pin can work its way out without it. Then you lose the pin and have to start over.
Don’t force the pin if it doesn’t slide in. You might have the wrong size. Forcing it can damage the holes and make future repairs harder.
Where to Buy Replacement Shear Pins
You have a few good options. The best place is a dealer for your snow blower brand.
They will have the exact part you need. Bring your model number with you. It’s usually on a sticker on the frame of the machine.
Big box home improvement stores often carry common sizes. Look in the outdoor power equipment aisle. They sell generic packs that fit many models.
Online retailers are great too. You can search by your snow blower’s make and model. I like to buy a pack of five or ten.
They are cheap in bulk. I keep the extras in a labeled bag in my toolbox. You never know when you’ll need another one.
Knowing what are snow blower shear pins is useless if you can’t find them. Always have spares ready before the snow flies.
Are There Different Types of Shear Pins?
Yes, there are a few main kinds. The most common is the straight pin with a groove for a clip.
It looks like a bolt with the head cut off. Another type has a built-in spiral or spring. This is called a “roll pin” or “spring pin.”
Some older machines use a simple cotter pin as the shear device. The type you need depends on your machine’s design. Check your owner’s manual to be sure.
The size matters a lot too. They come in different diameters and lengths. A pin that is too thick won’t shear when it needs to.
A pin that is too thin will break too easily. You’ll be replacing it all the time. Using the right part is key.
When you ask “what are snow blower shear pins,” remember they are not all the same. Get the correct one for your machine.
How to Prevent Shear Pins from Breaking Too Often
You can’t stop them from breaking completely. That’s their job. But you can reduce how often it happens.
Clear your driveway before you snow blow. Pick up sticks, toys, and garden hoses. The less debris, the lower your risk.
Don’t try to blow snow that is too deep or heavy in one pass. Take smaller bites. Go slower over areas where you know rocks might be.
If you hit something, stop immediately. Don’t keep trying to force the auger through. Back up and see what you hit.
Remove the object by hand if you can. Then continue blowing snow. A little caution goes a long way.
According to the Consumer Product Safety Commission (CPSC), clearing the work area is a basic safety step for all power equipment.
What to Do If You Keep Breaking Pins
Breaking one pin now and then is normal. Breaking them every time you use the blower is a problem.
First, check your technique. Are you taking on too much snow at once? Are you going too fast?
Next, check the area you are clearing. Is it full of gravel or other hard objects? You might need to adjust the skid shoes on your blower.
Raise them up a bit. This creates a gap between the auger and the ground. It helps prevent the auger from scooping up rocks.
If pins keep breaking on flat, clear pavement, you might have a machine issue. The auger bearings could be seized. This puts extra strain on the pins.
A bent auger shaft can also cause constant breakage. In this case, you need a pro to look at it. Knowing what are snow blower shear pins helps you diagnose bigger problems.
Safety Tips When Working With Shear Pins
Always disconnect the spark plug before you start. This is the number one rule. It prevents the engine from starting accidentally.
Wear safety glasses when driving out an old pin. Small metal pieces can fly. Gloves are a good idea too, to protect your hands.
Use the right tools. A punch and a small hammer work best. Don’t use a screwdriver as a punch. It can slip and hurt you.
Make sure the machine is on a flat, stable surface. You don’t want it rolling while you work on it. Set the parking brake if it has one.
Keep kids and pets away from your work area. They might not understand the danger. Focus on the task until it’s done.
The National Safety Council emphasizes safe tool use. Taking a few minutes to be safe is always worth it.
Frequently Asked Questions
What are snow blower shear pins made of?
They are usually made of a softer grade of steel. This steel is strong enough for normal use. But it will snap under a sudden, high impact.
Can I use a nail instead of a shear pin?
No, you should never use a nail. A nail is not designed to shear cleanly. It could damage the holes or cause other parts to fail.
How many shear pins does a snow blower have?
Most two-stage snow blowers have two shear pins. One is on the left auger, one on the right. Some single-stage models might only have one.
What are snow blower shear pins cost?
They are very cheap. A single pin often costs between $2 and $5. Buying a pack of them brings the price down even more.
Do all snow blowers have shear pins?
Most do, but not all. Some newer or high-end models use a different kind of clutch system. Always check your owner’s manual to be sure.
What are snow blower shear pins’ main purpose?
Their main purpose is to protect the drivetrain. They break so your engine and gears don’t have to
