Introduction
Follow this guide to replace the belts on an EDCO PRO KL-18 Concrete Saw model 39600-HD.
Tools
Parts
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            Grab the plastic housing at the end of the spark plug wire. 
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            Pull firmly to disconnect the wire from the spark plug. 
 
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            Use your finger to spin the lock nut counterclockwise until there is a about a one inch gap between it and the frame. 
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            Wrap a piece of tape around the belt-tensioner bolt where it meets the frame. 
 
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            Use a 9/16 inch wrench to loosen the four nuts securing the engine block to the frame, two on the front and two on the back. 
 
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            Lift the outermost belt out of its pulley groove and rotate the motor pulley to remove it. 
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            Repeat for the two remaining belts. 
 
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            Use the two included 1-1/2 inch wrenches to twist the arbor shaft nut counterclockwise while holding the backing plate in place. 
 
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            Use a 9/16 inch socket to remove the four bolts securing the arbor shaft bearings to the frame. 
 
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To reassemble your device, follow these instructions in reverse order.