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Prerequisite-only guide to disconnect the chain on a Barreto Trencher E718MTH4S 2016.
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Make sure that both ignition switches are turned to the off position. There is one on the engine and one on the control panel.
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Pull the ring near one of the wheel hubs straight out, away from the wheel.
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Rotate it so that the small roll pin lines up with its slot.
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Release the ring so that the lock pin slides into the wheel. You may need to rotate the wheels a little before the lock pin fully engages.
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Repeat this step so that the lock pins on both wheels are engaged.
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Rotate the auger to move the chain until its master link (the link with the removable pin) is easily accessible.
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Use a pair of needle-nose pliers to straighten both sides of the cotter pin securing the pin in the master link.
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Insert the new cotter pin into the chain pin.
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Use a set of needle-nose pliers to bend each half of the cotter pin back around the chain pin to secure the cotter pin.
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Turn the auger to move the chain until the master link is positioned on top of the boom.
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Place the smaller, flat end of a 3/16 inch pin punch against the end of the master link pin that previously held the cotter pin.
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Hit the larger end of the punch with a heavy hammer to tap the pin out of the master link.
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If you are still having trouble, a two-jaw gear puller or in-line pin puller might work better. When using a gear puller, it might be necessary to stabilize the claw side of the puller with some kind of spacer that won't be crushed when you start pushing the pin out. A 3/4 inch socket works well.
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