Conair Positive Displacement Pump PD3

Stop the vacuum pump, disconnect and lockout the main power to the pump

Inspect the vacuum relief valve for contamination, residue, or foreign substances

Clean the inner components of the valve using a cleaning agent

Ensure eye protection is worn during cleaning

Reassemble the valve and re-adjust to the proper vacuum setting

Remove the inlet hose on the inlet filter housing

Partially obstruct the inlet using a rigid flat plate until 12 inches Hg registers on the gauge

Does the relief valve open at approximately 12 inches Hg?

Did the valve release at or below 15 inches Hg?

Replace the valve if it did not release at or below 15 inches Hg

Reconnect the hose to the inlet of the pump