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The McCulloch Power Mac 310 chain saw is a somewhat vintage model. It was new about the same time the first personal computers came on the market, in the mid 1980s. Like most chain saws, it has three carburetor adjustment screws, and chances are good that they need adjusting. It's a fairly simple matter to set the idle and low-speed screws, but setting the high-speed screw is challenging and shouldn't be attempted without a tachometer. Without one, it's simple to set the fuel mixture too lean and burn out the motor.
1
Remove the air box cover from the left side of the McCulloch Power Mac 310 chain saw by using a Phillips screwdriver to remove its single screw. The chain saw's left side is the side that is on your left when you operate the chain saw. Remove the air filter, and clean it with compressed air. If you can't clean it, then replace it.
2
Drain fuel from the chain saw's fuel tank, and replace it with fresh, high-octane gasoline mixed with two-cycle engine oil at a ratio of 40 parts gasoline to 1 part oil. Fill the fuel tank completely with the mixture. Otherwise, the engine might run too rich the next time you fill the tank.
3
Start the chain saw's engine, and let it warm up for about five minutes. If the carburetor is so far out of adjustment that the engine won't start, turn both the high-speed screw -- H -- and low-speed screw -- L -- clockwise as far as they will go, using a flat-head screwdriver, then turn them counterclockwise by 1 1/2 turns.
4
Turn the idle screw -- I -- clockwise until the chain starts to spin, then turn it counterclockwise slightly. Adjust the screw to find the highest setting possible without making the chain spin. Check the setting by holding a digital tachometer over the spark plug. It should read between 2,700 and 2,900 rpm.
5
Turn the low-speed screw clockwise until the engine begins to race, and make a note of that position of the screw. Turn the low-speed screw counterclockwise until the engine begins to stall, and note that position of the screw. The final setting is midway between those two positions. This adjustment may throw off the idle adjustment, and so resetting it may be necessary.
6
Engage the throttle, and while the saw is running at full speed, turn the high-speed screw clockwise until the engine races and the motor sounds thin. Turn the high-speed screw counterclockwise until the motor takes on a lustier gurgling sound without losing power. Check the engine speed with the digital tachometer. It should be fewer than 13,000 rpm.
7
Readjust both the low-speed screw and idle screw.
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References (2)About the Author
Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. As a landscape builder, he helped establish two gardening companies.
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Deziel, Chris. 'How to Adjust the Carburetor on a McCulloch Chain Saw Model 310.' Home Guides | SF Gate, http://homeguides.sfgate.com/adjust-carburetor-mcculloch-chain-saw-model-310-101690.html. Accessed 09 March 2020.
Deziel, Chris. (n.d.). How to Adjust the Carburetor on a McCulloch Chain Saw Model 310. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/adjust-carburetor-mcculloch-chain-saw-model-310-101690.html
Deziel, Chris. 'How to Adjust the Carburetor on a McCulloch Chain Saw Model 310' accessed March 09, 2020. http://homeguides.sfgate.com/adjust-carburetor-mcculloch-chain-saw-model-310-101690.html
Note: Depending on which text editor you're pasting into, you might have to add the italics to the site name.
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McCulloch chain saws, like all other chain saws, require continuous lubrication during use to prevent the chain from catching on the wood being cut. Without the proper lubrication, kickback or pull-in of the chain saw blade may occur, putting you at risk for catastrophic injury. McCulloch chain saws are equipped with automatic oilers and lack the chain oil adjustment screw that many other brands possess. In spite of that fact, you can still take measures to adjust the amount of oil that coats the chain saw chain during use.
1
Fill the chain saw chain oil reservoir with the type of oil recommended by McCulloch. Refer to the operator's manual to ascertain which oil is recommended for your model. Avoid adding an excess amount of oil to the container. Drain some of the oil if the tank is already overfilled which you check it. Too little or too much oil in the reservoir can alter the machine's output.
2
Assess the oil output of the chain saw bar oiler to determine whether or not adjustment is necessary. Allow the chain saw to run for 2 to 3 minutes to warm up. Point the tip of the chain saw toward a light-colored surface and hold it about 6 inches away. Increase the throttle, allowing the chain to rotate several times. Stop the chain saw and check the surface for the telltale splatter of oil that proves the lubrication is being applied to the blade.
3
Loosen the chain saw guide bar and remove the chain from it. Wrap the end of a toothpick in a soft cloth and use it to clean out the channel that runs the length of the blade. Cleaning the channel ensures that the space is free for chain oil to flow through and properly lubricate the chain.
4
Unclog the hole that emits the oil from the automatic oiler to allow the oil to flow freely. Insert the tip of a paper clip that's been straightened into the hole, and work it in and out to ensure the passage is free.
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References (2)About the Author
Amie Taylor has been a writer since 2000. Book reviews, gardening and outdoor lawn equipment repair articles and short fiction account for a handful of her published works. Taylor gained her gardening and outdoor equipment repair experience from working in the landscaping and lawn-care business she and her husband own and operate.
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Taylor, Amie. 'How to Adjust the Oiler on a McCulloch Chainsaw.' Home Guides | SF Gate, http://homeguides.sfgate.com/adjust-oiler-mcculloch-chainsaw-101872.html. Accessed 09 March 2020.
Taylor, Amie. (n.d.). How to Adjust the Oiler on a McCulloch Chainsaw. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/adjust-oiler-mcculloch-chainsaw-101872.html
Taylor, Amie. 'How to Adjust the Oiler on a McCulloch Chainsaw' accessed March 09, 2020. http://homeguides.sfgate.com/adjust-oiler-mcculloch-chainsaw-101872.html
Note: Depending on which text editor you're pasting into, you might have to add the italics to the site name.
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