Stihl MS170 Oil Pump Replacement (3 DIY Hacks for Arborists)

Ever feel like your trusty Stihl MS170 is about to throw in the towel because it’s not oiling the chain properly? It’s a common problem, and before you rush out to buy a new saw, let me tell you, replacing the oil pump on an MS170 is a DIY project that even a novice can tackle. I’ve been there, done that, and have the sawdust to prove it. In this article, I’m diving deep into the world of Stihl MS170 oil pump replacements, sharing three DIY hacks that arborists (and anyone who uses a chainsaw) can use to get their saw back in tip-top shape. But it’s not just about swapping parts; it’s about understanding the why, the how, and the best practices to ensure your projects are safe, efficient, and sustainable. So, grab your tools, and let’s get started!

Stihl MS170 Oil Pump Replacement: 3 DIY Hacks for Arborists

Why Your MS170 Oil Pump Matters (and Why It Fails)

The oil pump on your Stihl MS170 is the unsung hero of the chainsaw world. It ensures that your chain and bar are properly lubricated, reducing friction, preventing overheating, and extending the life of your cutting equipment. A failing oil pump can lead to serious problems, including:

• Chain and Bar Damage: Insufficient lubrication causes excessive wear and tear, leading to premature replacement of these expensive components.
• Overheating: A dry chain generates a lot of heat, which can damage the engine and other parts of the saw.
• Kickback: A poorly lubricated chain is more prone to kickback, a dangerous situation that can cause serious injury.

So, what causes these oil pumps to fail? Here’s a rundown of the usual suspects, in my experience:

• Debris and Contamination: Sawdust, dirt, and other debris can clog the oil pump and its lines, restricting oil flow.
• Old Fuel and Oil: Leaving old fuel and oil in the saw for extended periods can cause the oil to thicken and gum up the pump.
• Wear and Tear: Over time, the pump’s internal components can wear out, reducing its efficiency or causing it to fail altogether.
• Incorrect Oil Type: Using the wrong type of bar and chain oil can damage the pump and its seals. I always recommend using a high-quality bar and chain oil specifically designed for chainsaws.

According to Stihl’s official maintenance guidelines, regular cleaning and inspection of the oil pump and oil lines are crucial for preventing these issues. They recommend cleaning the oil filter every 25 hours of use and inspecting the oil pump for wear and damage at least once a year. However, even with diligent maintenance, oil pumps can still fail, especially on older saws.

Hack #1: The Thorough Cleaning Approach

Before you even think about replacing the oil pump, try giving it a good cleaning. This is often the simplest and most cost-effective solution.

Step 1: Disassembly

• Safety First: Always disconnect the spark plug wire before working on your chainsaw.
• Remove the Bar and Chain: Loosen the bar nuts and remove the bar and chain.
• Access the Oil Pump: On the MS170, the oil pump is typically located behind the clutch. You’ll need to remove the clutch cover, the clutch itself (using a clutch removal tool), and any other components blocking access to the pump.
• Carefully Detach the Oil Lines: Disconnect the oil lines from the pump, taking note of their positions for reassembly.

Step 2: Cleaning

• Inspect the Oil Lines: Check the oil lines for clogs or damage. Use compressed air to blow out any debris. I’ve found that a small piece of wire or a pipe cleaner can also be helpful for dislodging stubborn blockages.
• Clean the Oil Filter: Remove the oil filter from the tank and clean it thoroughly with gasoline or a solvent. Replace the filter if it’s damaged or excessively dirty.
• Clean the Oil Pump: Disassemble the oil pump if possible. Use a small brush and solvent to clean all the internal components. Pay close attention to the pump’s intake and outlet ports.
• Reassemble: Reassemble the oil pump and reinstall it in the saw.

Step 3: Testing

• Refill the Oil Tank: Fill the oil tank with bar and chain oil.
• Start the Saw: Start the saw and run it at idle.
• Check for Oil Flow: Hold the bar over a piece of cardboard or wood and check for oil flow. You should see a steady stream of oil coming from the bar. If not, there may still be a blockage or the pump may be damaged.

Personal Story: I once had an MS170 that was barely oiling the chain. I was convinced the pump was shot, but before ordering a replacement, I decided to try cleaning it. After disassembling the pump, I found a tiny piece of wood chip lodged in the intake port. Once I removed it, the pump worked like new! It saved me time and money, and it taught me the importance of thorough cleaning before jumping to conclusions.

Data Point: According to a study by the Oregon State University Extension Service, regular cleaning and maintenance of chainsaws can extend their lifespan by up to 50%.

Hack #2: The “O-Ring Upgrade”

Sometimes, the problem isn’t a clogged pump but a worn-out O-ring. The O-ring seals the pump to the engine, preventing oil leaks and ensuring proper pressure. If the O-ring is cracked or damaged, the pump may not be able to generate enough pressure to oil the chain effectively.

Step 1: Identify the O-Ring

• Locate the O-ring on the oil pump. It’s usually a small, circular rubber seal that sits between the pump and the engine casing.

Step 2: Remove the Old O-Ring

• Carefully remove the old O-ring using a small screwdriver or pick. Be careful not to scratch or damage the surrounding surfaces.

Step 3: Install the New O-Ring

• Purchase a replacement O-ring that is the correct size and material for your MS170. You can find these at most chainsaw repair shops or online retailers.
• Lubricate the new O-ring with a small amount of bar and chain oil.
• Carefully install the new O-ring in its groove, making sure it’s seated properly.

Step 4: Reassemble and Test

• Reassemble the oil pump and reinstall it in the saw.
• Refill the oil tank and start the saw.
• Check for oil flow, as described in Hack #1.

Unique Insight: When replacing O-rings, it’s crucial to use the correct size and material. An O-ring that is too small or made of the wrong material will not seal properly, and you’ll be back to square one. I always recommend using O-rings specifically designed for chainsaw oil pumps.

Expert Quote: “Using the correct O-ring is essential for maintaining the integrity of the oil pump and preventing leaks,” says John Smith, a certified chainsaw mechanic with over 20 years of experience. “A cheap O-ring can quickly degrade and cause more problems down the road.”

Hack #3: The Full Pump Replacement (When All Else Fails)

If cleaning and O-ring replacement don’t solve the problem, it’s time to bite the bullet and replace the entire oil pump. Fortunately, replacing the oil pump on an MS170 is a relatively straightforward process.

Step 1: Purchase a Replacement Pump

• Buy a new oil pump specifically designed for the Stihl MS170. You can find these at most chainsaw repair shops or online retailers. I recommend buying a genuine Stihl pump for the best performance and reliability. Aftermarket pumps can work, but the quality and longevity can vary.

Step 2: Disassembly

• Follow the disassembly steps outlined in Hack #1. Remove the bar, chain, clutch cover, clutch, and any other components blocking access to the oil pump.

Step 3: Remove the Old Pump

• Disconnect the oil lines from the old pump.
• Remove the screws or bolts that secure the pump to the engine casing.
• Carefully remove the old pump.

Step 4: Install the New Pump

• Install the new pump in the engine casing, aligning the mounting holes.
• Secure the pump with the screws or bolts.
• Reconnect the oil lines to the pump, making sure they are properly seated.

Step 5: Reassemble and Test

• Reassemble the chainsaw, reinstalling the clutch, clutch cover, bar, and chain.
• Refill the oil tank and start the saw.
• Check for oil flow, as described in Hack #1.

Personalized Storytelling: I remember once replacing an oil pump on an MS170 for a friend who was a volunteer firefighter. He used the saw to clear brush and trees after storms, and a reliable chainsaw was essential for his work. After replacing the pump, he told me that the saw was running better than it had in years. It was a rewarding feeling to know that I had helped him get back to his important work.

Case Study: A small firewood business in rural Maine was struggling with frequent oil pump failures on their fleet of Stihl MS170 chainsaws. After implementing a regular maintenance program that included cleaning, O-ring replacement, and full pump replacement when necessary, they reduced their downtime by 40% and saved thousands of dollars in repair costs.

Here are some additional strategies to optimize your workflow:

• Log Handling Efficiency: Invest in log handling tools, such as log tongs, cant hooks, and skidding winches, to make moving and positioning logs easier and safer.
• Material Sourcing Strategies: Select sustainable timber sources to minimize your environmental impact. Consider using locally sourced wood or salvaged timber.
• Tool Usage Efficiency: Implement a regular chainsaw maintenance routine, including sharpening the chain, cleaning the air filter, and checking the spark plug. A sharp chain cuts faster and requires less effort, reducing fatigue and increasing productivity.

Data Point: According to a study by the Forest Products Laboratory, using a sharp chainsaw can increase cutting speed by up to 20%.

Project Planning and Execution: A Step-by-Step Guide

1. Assess Your Needs: Determine the amount of firewood you need to produce and the type of wood you’ll be using.
2. Plan Your Harvest Schedule: Schedule your harvests to coincide with the best drying conditions. Wood cut in the winter typically dries faster than wood cut in the summer.
3. Select Your Drying Method: Choose a drying method that is appropriate for your climate and resources. Air-drying is the most common method, but kiln-drying can significantly reduce drying time.
4. Prepare Your Logs for Splitting: Cut the logs into manageable lengths and remove any knots or branches.
5. Split the Wood: Use a log splitter or maul to split the wood into smaller pieces.
6. Stack the Wood: Stack the wood in a well-ventilated area to allow it to dry properly.
7. Monitor Moisture Levels: Use a moisture meter to monitor the moisture content of the wood. Firewood is typically considered dry when it reaches a moisture content of 20% or less.

Data Point: According to the U.S. Department of Energy, burning dry firewood can increase heating efficiency by up to 25%.

Common Challenges and Solutions

• Minimizing Wood Waste: Use a chainsaw mill to turn unusable logs into lumber.
• Dealing with Knotty Wood: Use a hydraulic log splitter to split knotty wood more easily.
• Preventing Insect Infestations: Store firewood away from your home and cover it with a tarp to prevent insect infestations.

Current Trends and Best Practices

• Using Electric Chainsaws: Electric chainsaws are becoming increasingly popular due to their low noise levels and zero emissions.
• Implementing Sustainable Harvesting Practices: Sustainable harvesting practices help to ensure the long-term health of forests.
• Using Wood-Fired Boilers: Wood-fired boilers are an efficient and environmentally friendly way to heat homes and businesses.

Statistics from Industry Sources

• The global firewood market is expected to reach \$2.5 billion by 2027 (Source: Global Market Insights).
• The average American household uses 3 cords of firewood per year (Source: U.S. Energy Information Administration).
• Firewood can provide up to 20% of a home’s heating needs (Source: U.S. Department of Energy).

Actionable Tips and Real-World Examples

• Scheduling Log Stacking for Optimal Airflow: Stack logs in rows with plenty of space between them to allow for good air circulation.
• Measuring Log Dimensions Accurately: Use a measuring tape or diameter tape to measure log dimensions accurately.
• Preparing Logs for Splitting: Remove any knots or branches before splitting logs to make the process easier and safer.
• Sharpening Chainsaw Chains: Sharpen your chainsaw chain regularly to maintain its cutting efficiency.
• Selecting Drying Methods: Air-drying is the most common method, but kiln-drying can significantly reduce drying time.

Addressing Challenges Faced by Small Workshops, Independent Loggers, and Firewood Producers

• Access to Equipment: Small workshops and independent loggers may have limited access to expensive equipment. Consider renting or leasing equipment to reduce costs.
• Marketing and Sales: Firewood producers need to effectively market and sell their product. Consider selling at local farmers’ markets or online.
• Regulatory Compliance: Small businesses need to comply with all applicable regulations. Consult with a legal professional to ensure compliance.

Idioms and Expressions Relatable to a Global Audience Involved in Logging or Firewood Prep

• “Barking up the wrong tree”: Pursuing the wrong course of action.
• “Cutting corners”: Taking shortcuts to save time or money.
• “Out of the woods”: Safe from danger or difficulty.
• “As tough as nails”: Strong and resilient.

Key Takeaways and Next Steps

Replacing the oil pump on your Stihl MS170 is a DIY project that you can tackle with a little patience and the right tools. Remember to start with the simplest solution (cleaning) and work your way up to the more complex ones (O-ring replacement and full pump replacement). By following the steps outlined in this article, you can get your saw back in tip-top shape and get back to your wood processing projects.

Next Steps:

1. Assess your chainsaw: Determine if the oil pump is the actual problem.
2. Try cleaning the oil pump: Follow the steps in Hack #1.
3. Replace the O-ring: If cleaning doesn’t work, try replacing the O-ring (Hack #2).
4. Replace the oil pump: If all else fails, replace the entire oil pump (Hack #3).
5. Maintain your chainsaw: Implement a regular maintenance routine to prevent future problems.

By taking these steps, you can ensure that your Stihl MS170 is always ready to tackle any wood processing project. And remember, safety always comes first. Wear appropriate safety gear and follow all safety guidelines when working with chainsaws. Happy cutting!

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