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- McCULLOCH SUPPORT AND SERVICE. McCulloch products are built for reliable performance, year after year. But they do need care and maintenance, sometimes new parts, in order to function properly. To find out what you need to do, download our user manuals or watch our helpful service videos. Many common questions are also answered in the FAQ.
As many of you who own newer Mac saws know, there are three carburetor adjustment screws on the left side of the case. These are marked 't', 'l' and 'h'. I have a 3200 with about 10 hours on it and recently it has been showing signs of a too rich idle mixture, i.e. if I set the running saw down for more than a minute it will load-up and die. How to adjust McCulloch 3200 series 38cc chainsaw engine How can I repair a gas leak on my McCulloch weed eater? Gas chainsaw model # 350.350990 Craftsman Gas Chainsaw Model917.353731 Gas Chainsaw Model: 358350270 Craftsman gas chainsaw manual Craftsman chainsaw 358.356240 Craftsman Gas, chainsaw Other MCCULLOCH Chainsaw, Gas Questions.
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Internal combustion requires fuel to blend with air. The carburetor handles this for Mcculloch chain saws, just as for any small gas-powered yard tools. Opencpn mac manual. Needles regulate the amount of fuel and air that are mixed. The needles are controlled by three adjustment screws: an idle, a low-speed and a high-speed screw. Carburetors are pre-set by the manufacturer, but can fall out of adjustment after many hours of use. Adjusting the needles that control the intake and mixture is not a job for the inexperienced.
1
Unscrew and remove the main cover, air filter cover and air filter. Beneath these, you will see a metal plate covering the carburetor. Unscrew the plate and pull it off to reveal the carburetor and its three adjustment screws. If you are working with a tachometer, attach it according to manufacturer instructions.
2
Turn both the high- and low-speed adjustment screws clockwise until they stop, but do not force them. Turn each screw back one full turn and start the engine. Allow the engine to warm up for about five minutes.
3
Mac tools ac 650 manual pdf. Measure the idle speed if using a tachometer. Ideally, it should read approximately 2,700 RPM. If you choose not to use one, use the screwdriver to turn the idle screw as high as possible without engaging the clutch. If the chains start spinning, turn the screw back until it stops.
4
Adjust the low-speed screw using the screwdriver. Turn it slightly back and forth and listen for the engine sounds to change. On one end, it will surge heavily. On the other end, it will nearly die. Find the midway point between these two extremes. You may need to return to the idle adjustment after completing the low-speed adjustment. If so, repeat Step 3 and then continue on to Step 5.
5
Quickbooks for mac manual pdf. Open the trigger fully and listen to the motor. It should scream when it is completely open, then flutter when idle. A tachometer reading should be generally between 10,000 and 12,000 RPM when fully open. Only attempt to adjust the high-speed screw if it is absolutely necessary to machine operation. Use extreme caution with this adjustment and turn only 1/8 turn at a time. Making hasty adjustments can blow out the engine and cause irreparable damage.
Things You Will Need
- Phillips screwdriver
- Flathead screwdriver
- Tachometer (optional)
Tips
- Make sure you have at least half a tank of clean, new gasoline in the tank before attempting the procedure.
- It is a good idea to clean parts when you carry out any repair. Replace or clean air filters and clean away any grime and grease you encounter to keep your machine in optimal shape.
- Some new models of McCulloch chain saws have limiting caps on the carburetor adjustment screws due to regulations imposed on manufacturers. In this case, it is best to take your chain saw to a professional for adjustments.
References (3)
About the Author
Josie Myers has been a freelance writer and tutor since 2008. A mother of three, she was a pre-kindergarten teacher for seven years, is a Pennsylvania-certified tree tender and served as director of parks in her local municipality. Myers holds a Bachelor of Arts in music and business from Mansfield University and a Master of Arts in English from West Chester University. Mcculloch pro mac 55 manual.
Photo Credits
- Zedcor Wholly Owned/PhotoObjects.net/Getty Images
Choose Citation Style
Myers, Josie. 'How to Adjust the Needles on a McCulloch Chain Saw.' Home Guides | SF Gate, http://homeguides.sfgate.com/adjust-needles-mcculloch-chain-saw-103122.html. Accessed 13 August 2019.
Myers, Josie. (n.d.). How to Adjust the Needles on a McCulloch Chain Saw. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/adjust-needles-mcculloch-chain-saw-103122.html
Myers, Josie. 'How to Adjust the Needles on a McCulloch Chain Saw' accessed August 13, 2019. http://homeguides.sfgate.com/adjust-needles-mcculloch-chain-saw-103122.html
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