Stihl 028 Av Super Oil Pump Gear – Essential Guide To Replacement
Your Stihl 028 AV Super chainsaw relies on a tiny, yet critically important component: the oil pump gear. This guide will walk you through everything you need to know about this vital part, from understanding its function to diagnosing common problems, performing a successful replacement, and implementing best practices for its long-term care, ensuring your saw continues to perform reliably.
Every Stihl 028 AV Super owner knows the power and reliability these machines offer, making quick work of tough jobs. However, even the most robust tools have wear parts, and a failing oil pump gear can quickly turn your trusty chainsaw into a dry, damaged mess.
If you’ve noticed inconsistent chain lubrication, excessive bar and chain wear, or even smoke from friction, your stihl 028 av super oil pump gear might be the culprit. Understanding this small but mighty component is key to keeping your saw running efficiently and safely.
This comprehensive guide will empower you with the knowledge and practical steps to tackle common issues, perform a replacement, and ensure your Stihl 028 AV Super continues to deliver optimal performance and longevity for years to come.
Understanding the Stihl 028 AV Super Oil Pump Gear: Its Role and Importance
The stihl 028 av super oil pump gear is a small, often overlooked, but absolutely critical component in your chainsaw’s lubrication system. It’s the unsung hero that ensures your bar and chain receive a consistent supply of oil.
Without proper lubrication, friction rapidly builds up, leading to excessive heat. This heat can quickly damage your guide bar, chain, and even the saw’s engine components.
How the Oil Pump System Works
When your Stihl 028 AV Super engine runs, it drives a worm gear. This worm gear, in turn, engages with the oil pump gear.
The rotation of the oil pump gear activates the oil pump, drawing chain lubricant from the oil tank.
This oil is then precisely delivered to the guide bar and chain, ensuring smooth operation and preventing premature wear.
Why a Healthy Oil Pump Gear Matters
A properly functioning oil pump gear guarantees adequate lubrication. This translates directly to several benefits of stihl 028 av super oil pump gear in good condition.
- Extended Bar and Chain Life: Reduced friction means less wear and tear.
- Improved Cutting Performance: A well-lubricated chain cuts more smoothly and efficiently.
- Prevented Engine Damage: Overheating from lack of lubrication can transfer to engine components.
- Enhanced Safety: A properly functioning saw is a safer saw.
Common Problems with Stihl 028 AV Super Oil Pump Gear
Even with regular maintenance, the stihl 028 av super oil pump gear can develop issues over time. Recognizing these common problems early can save you significant time and money.
Being attentive to your saw’s performance is the first step in effective troubleshooting.
Signs of a Failing Oil Pump Gear
Several indicators point to a problem with your oil pump gear or the lubrication system as a whole.
- No Oil Flow to the Bar: This is the most obvious sign. Check for oil spray when running the saw over a clean surface.
- Inconsistent Oil Flow: Sometimes oil flows, sometimes it doesn’t, or it’s very weak.
- Excessive Bar and Chain Wear: If your bar and chain are wearing out faster than usual, lack of oil is often the cause.
- Smoking Bar/Chain: Friction-induced heat can cause the bar or chain to smoke during operation.
- Increased Effort to Cut: A dry chain requires more force to cut through wood.
- Visible Damage to the Gear: Upon inspection, the gear teeth might appear worn, stripped, or cracked.
Causes of Oil Pump Gear Failure
Understanding the root causes helps prevent future issues and informs your repair strategy.
- Wear and Tear: Over time, the plastic or metal gear teeth simply wear down from constant operation.
- Debris Contamination: Sawdust, dirt, or metal shavings can get into the oil pump mechanism, causing damage.
- Improper Chain Oil: Using oil that is too thick or contains contaminants can strain the pump.
- Overheating: Prolonged use without proper lubrication can cause the plastic gear to warp or melt.
- Manufacturing Defects: Though rare, a faulty gear from the factory can fail prematurely.
How to Diagnose and Inspect Your Oil Pump Gear
Before you dive into replacement, a thorough diagnosis is crucial. This section will guide you on how to stihl 028 av super oil pump gear inspection and troubleshooting.
Safety is paramount when working with chainsaws. Always disconnect the spark plug wire before beginning any inspection or repair.
Initial Oil Flow Check
- Clear the Area: Find a clear, light-colored surface (like a piece of cardboard or concrete).
- Fill Oil Tank: Ensure the chain oil tank is full with fresh, appropriate bar and chain oil.
- Start the Saw: Start the Stihl 028 AV Super and let it idle for a few moments.
- Test Oil Flow: With the engine running, hold the saw with the guide bar pointing down and slightly rev the engine. You should see a fine spray of oil being flung off the chain tip onto the surface.
- Observe Results: If there’s no oil, inconsistent oil, or very little oil, proceed to further inspection.
Inspecting the Oil Pump Gear
Accessing the oil pump gear requires some disassembly. This is a good time to practice stihl 028 av super oil pump gear tips for careful disassembly.
- Disconnect Spark Plug: Always the first step for safety.
- Remove Clutch Cover and Bar/Chain: Loosen the two nuts holding the clutch cover, remove the cover, guide bar, and chain.
- Remove the Clutch: This is often the trickiest part. You’ll need a piston stop tool and a clutch removal tool (or a suitable wrench). Insert the piston stop into the spark plug hole. Turn the clutch counter-clockwise to loosen it. *Note: Stihl clutches are often reverse-threaded.*
- Remove the Worm Gear: Once the clutch is off, you’ll see the worm gear (often plastic) that drives the oil pump. Carefully remove it.
- Access the Oil Pump Assembly: The oil pump assembly is usually located behind the clutch drum area, often secured by a few screws. Remove these screws.
- Inspect the Gear: Carefully pull out the oil pump assembly. The stihl 028 av super oil pump gear itself will be visible. Look for stripped teeth, cracks, excessive wear, or deformation.
If the gear looks damaged, replacement is necessary. If it looks fine, the issue might be with the oil pump itself, the oil lines, or blockages in the bar’s oil channels.
Step-by-Step Replacement Guide: Installing a New Stihl 028 AV Super Oil Pump Gear
Replacing the stihl 028 av super oil pump gear is a manageable DIY task for many, but it requires patience and the right tools. Follow this stihl 028 av super oil pump gear guide carefully.
Remember, precision is key. Don’t force anything; if a part isn’t coming out easily, re-check your steps or consult a service manual.
Tools You’ll Need
- Spark plug wrench
- T27 Torx wrench (for Stihl screws)
- Flathead screwdriver
- Piston stop tool
- Clutch removal tool (often a specialized spanner or impact driver)
- Circlip pliers (internal type, if applicable to your pump)
- Clean rags
- New stihl 028 av super oil pump gear and possibly a new worm gear
- Optional: New oil lines and oil filter for complete overhaul
Disassembly Steps (Review from Diagnosis)
You’ll need to get to the point where the old oil pump assembly is removed. Refer to the “Inspecting the Oil Pump Gear” section above for detailed steps on removing the clutch cover, bar/chain, clutch, and worm gear.
- Disconnect Spark Plug.
- Remove Clutch Cover, Bar, and Chain.
- Remove Clutch: Use a piston stop and clutch tool, turning counter-clockwise (left-hand thread).
- Remove Worm Gear: It usually slides off the crankshaft.
- Remove Oil Pump Assembly: Unfasten the screws holding the oil pump housing. Carefully pull the entire assembly out.
Replacing the Gear
Once the oil pump assembly is out, the gear replacement can proceed.
- Separate the Old Gear: The oil pump gear is usually held onto the pump shaft by a circlip or simply slides off. Carefully remove the circlip using circlip pliers if present, then slide off the old gear.
- Clean the Area: Thoroughly clean the oil pump housing and any oil passages. Remove any old oil, sawdust, or debris. This is crucial for stihl 028 av super oil pump gear best practices.
- Install New Gear: Slide the new stihl 028 av super oil pump gear onto the shaft. Ensure it sits correctly and, if applicable, secure it with the circlip.
- Inspect Other Components: While you’re in there, check the oil lines for cracks or hardening. Consider replacing them and the oil filter if they show signs of wear.
Reassembly Steps
Reassembly is essentially the reverse of disassembly.
- Reinstall Oil Pump Assembly: Carefully position the oil pump assembly back into its housing and secure it with its screws. Ensure the oil lines are properly routed and connected.
- Reinstall Worm Gear: Slide the worm gear back onto the crankshaft. Ensure it’s correctly seated.
- Reinstall Clutch: Hand-tighten the clutch onto the crankshaft, then use the clutch tool to tighten it securely. Remember, it’s a left-hand thread, so tighten by turning clockwise. Remove the piston stop.
- Reinstall Bar and Chain: Mount the guide bar and chain, ensuring the chain tension is correct (snug but still able to be pulled by hand around the bar).
- Reinstall Clutch Cover: Secure the clutch cover with its two nuts.
- Reconnect Spark Plug Wire.
After reassembly, fill the oil tank and perform the initial oil flow check again to confirm successful lubrication.
Maintenance and Care Tips for Longevity
Proper care extends the life of your stihl 028 av super oil pump gear and the entire lubrication system. Adhering to a robust stihl 028 av super oil pump gear care guide is essential.
Preventative maintenance is always better than reactive repairs.
Regular Cleaning and Inspection
- Clean the Oil Port: After each use, clean the oil outlet port on the guide bar and the oil entry hole on the bar itself. Sawdust and debris can easily clog these.
- Inspect Bar Grooves: Ensure the guide bar groove is clean and free of packed sawdust, which can impede oil flow.
- Check Oil Filter: Periodically check the oil filter inside the oil tank. A clogged filter restricts oil flow and strains the pump. Replace it if it’s dirty or damaged.
- Visual Gear Inspection: Whenever you have the clutch cover off for chain maintenance, take a quick look at the worm gear for excessive wear.
Using the Right Lubricants
The type of oil you use significantly impacts your oil pump’s health.
- Always Use Quality Bar and Chain Oil: Stihl recommends its own brand, but any high-quality, purpose-designed bar and chain oil is suitable. These oils are formulated with specific tackifiers and anti-wear additives.
- Avoid Used Motor Oil: Never use used motor oil or other non-specialized lubricants. They lack the necessary properties, can contain contaminants, and will cause premature wear and potential damage to your pump and bar.
- Adjust for Temperature: In colder weather, a lighter viscosity bar oil might be beneficial to ensure consistent flow. In very hot conditions, a slightly heavier oil might be preferred.
Sustainable and Eco-Friendly Practices
For those mindful of environmental impact, consider these sustainable stihl 028 av super oil pump gear and overall saw care practices.
- Biodegradable Bar Oil: Many manufacturers, including Stihl, offer biodegradable bar and chain oils. These break down more naturally in the environment.
- Proper Disposal of Old Parts: Dispose of old oil pump gears, oil filters, and used oil responsibly. Check with your local recycling centers for proper disposal methods. This aligns with eco-friendly stihl 028 av super oil pump gear principles.
- Regular Maintenance: Keeping your saw well-maintained reduces fuel consumption and emissions, contributing to a smaller environmental footprint.
When to Call a Professional
While many oil pump gear issues can be tackled by a diligent DIYer, there are times when calling a professional is the smartest move.
Don’t hesitate to seek expert help if you encounter difficulties or feel unsure about any step.
Situations Requiring Professional Help
- Difficulty with Clutch Removal: If the clutch is seized or you lack the proper tools, a professional can remove it safely without damaging the crankshaft.
- Unexplained Oil Flow Issues: If you’ve replaced the gear and worm gear, cleaned all passages, and still have no oil flow, the problem might be deeper within the oil pump assembly or other internal components that require specialized tools and expertise.
- Engine Component Damage: If the lack of oil has led to damage beyond the bar and chain, such as to crankshaft bearings or piston, professional assessment is crucial.
- Lack of Confidence: If you’re uncomfortable with any part of the disassembly or reassembly, it’s always safer to let a certified Stihl technician handle it.
A professional technician has the specialized tools, diagnostic equipment, and experience to quickly identify and resolve complex issues, ensuring your Stihl 028 AV Super is repaired correctly and safely.
Frequently Asked Questions About Stihl 028 AV Super Oil Pump Gear
We’ve covered a lot, but here are some quick answers to common questions about this essential component.
How often should I check my Stihl 028 AV Super oil pump gear?
You should check your oil flow before each use. A visual inspection of the worm gear can be done whenever the clutch cover is off for routine chain maintenance. A full inspection of the oil pump gear itself is typically only needed if you suspect a lubrication problem.
Can I use a non-OEM oil pump gear for my Stihl 028 AV Super?
While aftermarket gears are available, it’s generally recommended to use genuine Stihl parts or high-quality OEM-equivalent parts. Inferior gears may not fit correctly, wear out quickly, or fail prematurely, potentially causing more significant damage.
What if my chainsaw is leaking oil? Is that related to the oil pump gear?
An oil leak is usually not directly caused by the oil pump gear itself. More often, leaks stem from cracked oil lines, a damaged oil tank, a loose oil cap, or a faulty oil pump seal. However, a damaged oil pump housing could also be a source of leaks.
Is it normal for my Stihl 028 AV Super to use a lot of bar oil?
Chainsaws consume bar oil at a relatively high rate; it’s designed to be used up during operation. A good rule of thumb is that your oil tank should empty at roughly the same rate as your fuel tank. If you’re going through oil much faster than fuel, you might have an oil leak or an over-active pump (less common).
What’s the difference between the oil pump gear and the worm gear?
The worm gear is a plastic gear mounted directly on the crankshaft, driven by the engine. It then meshes with and drives the oil pump gear, which is part of the oil pump assembly and directly activates the pump mechanism to deliver oil.
Conclusion
The stihl 028 av super oil pump gear might be a small part, but its role in your chainsaw’s performance and longevity is immense. Understanding its function, recognizing the signs of failure, and knowing how to properly inspect and replace it are vital skills for any serious Stihl 028 AV Super owner.
By following this comprehensive guide, you’re not just fixing a part; you’re investing in the continued reliability and efficiency of your valuable tool. Remember to prioritize safety, use the right tools, and don’t hesitate to seek professional help if a task feels beyond your comfort level.
Keep your Stihl 028 AV Super well-lubricated, well-maintained, and ready for any challenge. Happy cutting!
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