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Use this guide to adjust the chain tension on a Barreto Trencher E718MTH4S 2016.
Position the trencher on a flat surface and turn the engine and power off before starting any work.
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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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Make sure the boom is in a horizontal position.
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Use a 3/4 inch open-end wrench to loosen the adjuster screw locknut so that you have enough space to tighten the adjuster screw as needed.
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Use a 1/2 inch open-end wrench to tighten or loosen the adjuster screw.
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Adjust the screw until there is about a 1 inch gap (3.8 cm, or about two fingers wide) between the bottom of the boom and the lowest part of the top of the chain.
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After the chain is properly tensioned, use a 3/4 inch open-end wrench to tighten the adjuster screw locknut.
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