Introduction
Follow this guide to replace the belt on a EDCO Disk Grinder model 50200-HD.
This repair requires two people.
Tools
Parts
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            Ensure the machine is unplugged. 
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            Turn the power switch counterclockwise into the OFF position. 
 
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            Slide the motor towards the front of the machine as far as it will go to loosen the belt tension. 
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            Use a 9/16 inch socket to tighten the four bolts back down to lock the motor in a position where there's the least belt tension. 
 
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            Pinch a flathead screwdriver between the belt and sheave. 
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            Rotate the sheave and pivot the belt up and away from its groove. 
 
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            Continue to rotate the sheave with once hand while holding the flathead screwdriver with the other to fully dislodge the belt from the groove. 
 
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To reassemble your device, follow these instructions in reverse order.