Floor Pump Gauge Replacement

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Introduction

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.

What you need

Step 1 Removing the Gauge Cover

Floor Pump Gauge Replacement, Removing the Gauge Cover: step 1, image 1 of 2

Floor Pump Gauge Replacement, Removing the Gauge Cover: step 1, image 2 of 2

Using a flat head screwdriver, pry up an edge of the gauge cover.
Remove the gauge cover.

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Step 2 Removing the Gauge Face Plate and Internals

Floor Pump Gauge Replacement, Removing the Gauge Face Plate and Internals: step 2, image 1 of 3

Floor Pump Gauge Replacement, Removing the Gauge Face Plate and Internals: step 2, image 2 of 3

Floor Pump Gauge Replacement, Removing the Gauge Face Plate and Internals: step 2, image 3 of 3

No parts from the old gauge will be re-used, so there is no need to attempt to preserve the parts. However, be careful not to damage the gauge housing.
Pry up a corner of the gauge face plate.
Use pliers to pull off the gauge face plate.
Be careful not to cut yourself when prying off the face plate, as the edges are sharp.
Use pliers to pry out the internal gauge mechanics.

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Step 3 Removing the Old Gauge

Floor Pump Gauge Replacement, Removing the Old Gauge: step 3, image 1 of 2

Floor Pump Gauge Replacement, Removing the Old Gauge: step 3, image 2 of 2

Using pliers, grip the exposed brass piece and unthread the gauge by rotating it counter-clockwise.
Pull the gauge out of its housing.

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Step 4 Replacing the Gauge O-rings

Floor Pump Gauge Replacement, Replacing the Gauge O-rings: step 4, image 1 of 2

Floor Pump Gauge Replacement, Replacing the Gauge O-rings: step 4, image 2 of 2

Remove the O-ring at the bottom of the threaded hole.
Place a new O-ring into the hole.

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Step 5 Applying Threadlocker

Floor Pump Gauge Replacement, Applying Threadlocker: step 5, image 1 of 1

Apply medium-strength Loctite (green, 290) to the threads on the new gauge.
Apply a thin layer, but make sure it covers all the threads.

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Step 6 Installing the New Gauge

Floor Pump Gauge Replacement, Installing the New Gauge: step 6, image 1 of 3

Floor Pump Gauge Replacement, Installing the New Gauge: step 6, image 2 of 3

Floor Pump Gauge Replacement, Installing the New Gauge: step 6, image 3 of 3

Thread the new gauge into the floor pump by turning it clockwise in its housing.
Thread the gauge until it is snug and the BAR/psi markings are aligned with the pump body.
Gauge performance will not be affected by its position, so long as it is snug.
Allow at least 30 minutes for the thread locker to set.
Test the pump to its highest rated pressure and listen for leaks. If you can hear leaks from the gauge, tighten it.