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Power Tool Repair serving Mobile Jobbers and Volume Distributors in the automotive field In business for over 18 years serving automotive pneumatic and electric tools electric...
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It is many years since I laid hands on a Lawnboy mower so I am not really familiar with the model but the principle of the air vane governor is fairly standard.
Briefly, the air vane and carb throttle butterfly is connected together and biased by a spring into the basic position where the throttle butterfly is open and the air vane is close to the fan. When the engine is running the air vane is forced away from the fan closing the throttle until engine revs/air draught and spring tension is in equilibrium.
The throttle control is connected to the linkage via a spring and increasing the engine speed increases the spring tension/air vane bias towards the fan, thus opening the throttle butterfly until the increased air draught moves the vane and tends to close the butterfly until a new equilibrium is reached.
I'll bet your really talking about a 3/8 air ratchet, as 3/4 are used for sockets larger than 1 1/4 inch and are rated for more than 750 Ft= Lbs. of touque. The air rachet can be fixed by unscrewing the ractchet head from the motor barrell, inside the motor barell theres a rotor with air vanes in slots of the barrel. You'll find the vanes are stuck in the barrell as you haven't oiled the gun regularly enought, remove the vanes and clean them by rubbing them with air tool oil and slipping them into the slots they fit into. If they fal out you have them clean enough if their bent they will have to be replaced, clean the other parts by wiping them off with air tool oil till everything appears to be as clean as new screw it back togther and it'll work great.
The inlet air valve the trigger operates. Revisit the vanes. Look for cracked or chipped corners. The spring behind the vane can be weak too. The overall depth of the vane can be worn enough that the vane leans in the groove allowing air to escape lowering the power applied to the vanes.
This is almost certainly due to lean mixture. If your carb is adjustable, back out the high-speed mixture screw 180 degrees.
If there is no adjustment, then either the main jet is still partially blocked, or the carb has internal corrosion (in which case, you will need a new carb - it's not fixable).
there is a plastic vane that moves in response to the air flow created by the flywheel fan ... the faster the motor runs the more air and the more the vane is deflected .. the vane is connected to the throttle thru a spring .. as the vane is deflected it reduces the throttle setting to maintain a set speed (which is adjustable by a screw) ... if that vane becomes stuck by a leaf or twig then you lose that speed control .. also if it becomes disconnected from the throttle the engine will run away .. the manual on your generator will call that a "govener "
NOT exactly a solution, but may help you with your problem: I'm also a Owner of a 261 ( In fact 90% 0f all my Air Tools are IR) that I used everyday when I was working on Terex Equipment & EMD Locomotives. I "Upgraded" the Major Parts inside my Gun to the "Industrial Line" rather than the Automotive Parts since the 261 is classified as a Automotive Tool..and Installing an Adjustable Regulator on the Gun Helped a Lot too...by "tweeking" my Gun out, I was Pumping almost as much torque as some of the 1" Guns... FYI: Don't Over Oil as the Oil will absorb into the Vanes, causing them to Expand in thickness "Permanently"...just 2-3 drops of a Hi-Grade Air Tool Oil before starting the Day is enough...sounds to me like your Picking up some contamination someplace??
Pls put the vane on the position 2 and then manually turn the vanes to desired position it will not move until the time you turn the power off and you can enjoy the benefits of Mr slim....
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