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Replace the pressure gauge in your classic floor drive pump if the gauge appears to be inaccurate, is malfunctioning or has stopped working all together.
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Using a flat head screwdriver, pry up an edge of the gauge cover.
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Remove the gauge cover.
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Pry up a corner of the gauge face plate.
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Use pliers to pull off the gauge face plate.
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Use pliers to pry out the internal gauge mechanics.
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Using pliers, grip the exposed brass piece and unthread the gauge by rotating it counter-clockwise.
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Pull the gauge out of its housing.
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Remove the O-ring at the bottom of the threaded hole.
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Place a new O-ring into the hole.
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Apply medium-strength Loctite (green, 290) to the threads on the new gauge.
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Thread the new gauge into the floor pump by turning it clockwise in its housing.
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Thread the gauge until it is snug and the BAR/psi markings are aligned with the pump body.
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Allow at least 30 minutes for the thread locker to set.
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Test the pump to its highest rated pressure and listen for leaks. If you can hear leaks from the gauge, tighten it.
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