If your snowmobile suspension is starting to squeak or feel stiff, it might be time to grease the fittings. A grease zerk, also known as a grease fitting, allows you to inject fresh grease into pivot points and bushings. O'Reilly Auto Parts carries a range of zerks suitable for snowmobile suspensions. This guide explains what to look for, how to choose the right one, and how to install it correctly.
What Is a Grease Zerk and Why Does Your Snowmobile Suspension Need One?
A grease zerk is a small threaded fitting that connects a grease gun to the lubrication point. Snowmobile suspensions have multiple moving parts—A-arms, ski shocks, and rear suspension linkages—that rely on grease to reduce friction and wear. Without adequate lubrication, bushings wear out prematurely and suspension performance suffers. Most snowmobiles have factory-installed zerks, but they can get damaged or clogged over time. Replacing them is a simple way to keep your suspension in top shape.
Common Reasons for Replacing a Grease Zerk
- Stripped threads from overtightening.
- Broken or bent fitting after hitting a rock or stump.
- Clogged zerk that won't let grease through.
- Missing zerk that fell out or was never installed.
Types of Grease Zerks for Snowmobile Suspension
Not all zerks are the same. You need one that matches the thread size and type of fitting on your snowmobile. Most snowmobile suspensions use standard zerks with 1/4-28 or M6 threads, but it's best to check your manual. Here are the common types available at O'Reilly Auto Parts:
Straight Zerks
These are the most common. They have a straight body and are used where the grease gun can easily access the fitting. If your original zerk was straight and the area is open, this is the simplest replacement.
45° and 90° Angled Zerks
Angled zerks are useful when the suspension geometry blocks direct access. A 45° or 90° zerk lets you attach the grease gun from a better angle. For snowmobile suspensions, 90° zerks are often used on lower A-arms where space is tight.
Flush or Button Head Zerks
Flush zerks sit nearly flush with the surface. They're used where a protruding zerk could get snagged. Some snowmobile suspensions use them on slider shoes or other low-clearance areas.
Thread Sizes: SAE vs. Metric
American snowmobiles often use SAE threads (1/4-28, 5/16-24), while many newer models use metric (M6x1.0, M8x1.25). O'Reilly stocks both. Bring your old zerk to compare, or check the thread pitch before buying.
Finding the Right Grease Zerk at O'Reilly Auto Parts
O'Reilly Auto Parts carries a variety of zerks in their help section or by the grease guns. Here's how to find the right one:
Step 1: Identify the Thread Size and Type
Remove the old zerk with a wrench or socket. Take it to the store and match it against the thread gauge or ask a counter person. If you can't remove it, look up your snowmobile model's spec sheet online or in the service manual.
Step 2: Choose the Angle and Style
Decide whether a straight or angled zerk works best. Check the clearance around the hole. If the old zerk was straight but you had trouble reaching it, consider a 45° or 90° version.
Step 3: Select the Right Material
Most zerks are made of hardened steel or stainless steel. Hardened steel is fine for most applications, but if your snowmobile sees a lot of salt or moisture, a stainless steel zerk resists corrosion better. O'Reilly carries both.
Step 4: Check for a Ball Check Valve
Good zerks have a spring-loaded ball that prevents grease from leaking back out. Ensure the replacement has this feature. Cheap zerks may omit it, leading to grease loss.
How to Install a Grease Zerk on Your Snowmobile Suspension
Installing a new grease zerk is straightforward. Here's a step-by-step:
Tools Needed
- Wrench or socket that fits the zerk hex (usually 3/8" for 1/4-28, but check).
- Thread sealant or PTFE tape (optional, for metal-to-metal threads).
- Grease gun with compatible grease.
Step-by-Step Installation
- Clean the area around the hole. Remove any dirt or old grease.
- Apply thread sealant if desired. Use a drop of Loctite or a wrap of PTFE tape. This prevents leaks and makes future removal easier.
- Hand-tighten the zerk into the hole. Do not cross-thread.
- Tighten with a wrench just until snug. Over-tightening can strip the threads or break the zerk.
- Pump a small amount of grease through to confirm flow and clear any debris.
- Wipe off excess grease.
Common Installation Mistakes
- Using too much force—zerks are small and can snap.
- Installing without sealant, which can cause grease to seep past threads.
- Forgetting to check for blockages before installing.
Maintaining Your Snowmobile Suspension Zerks
Regular maintenance extends the life of your suspension. Here are tips:
Grease Schedule
Grease your suspension after every 300–500 miles or at the start of each ride day, especially if you ride in wet or slushy conditions. Over-greasing is better than under-greasing, but wipe away excess to avoid attracting dirt.
Inspect Zerks Regularly
After each ride, check that zerks are intact and not bent. Look for signs of grease leakage around the threads, which indicates a worn zerk or loose fitting.
Replace Damaged Zerks Promptly
A missing or broken zerk lets dirt enter the joint. If you notice one, replace it immediately to avoid costly bushing replacement.
Final Recommendation
For most snowmobile suspensions, a straight 1/4-28 hardened steel zerk from O'Reilly Auto Parts works well. If you have tight access, pick up a 90° angled zerk of the same thread size. Always bring your old zerk to the store for exact match. Stick with name brands like Dorman or OEM quality—they hold up to vibration and cold. Keep a few extra in your tool kit for trail repairs. With the right zerk and regular greasing, your snowmobile suspension will ride smooth all season long.