Intake filter PM
Inspect and replace intake elements and check intake restriction.
This guide is general field reference for trained, qualified service technicians. It is not a substitute for the original equipment manufacturer's service manual, applicable codes (NEC, OSHA, ASME, local), or the judgment of a licensed professional. Procedures, torque values, pressures, refrigerants, and safety requirements vary by make, model, jurisdiction, and revision. Always verify against current OEM documentation and follow your employer's safety program. Working on compressed-air, electrical, pressure-vessel, and refrigerant systems can cause serious injury or death. By using this guide you accept all risk; AirCompDX and its authors disclaim all warranties and are not liable for any damage, injury, loss, or code violation arising from its use.
LOTO before removing housings on tank-mounted pumps; the unloader will still cycle the pump on a live disconnect.
- Vacuum-restriction gauge (inches of H₂O) on screw units
- Soft brush, compressed air at <30 psi
- OEM intake element matched to micron and CFM
- 1Inspect housing
Check for cracks, missing wing nuts, and a torn gasket seal that bypasses unfiltered air directly into the pump.
- 2Element check
Hold to a light — if you can't see light through, replace. Tap loose dust into a pan; do not blow elements out and reuse on rotary screws.
- 3Measure restriction (screw)
Replace by hours OR when intake restriction exceeds OEM limit (typ. 15–25" H₂O). High restriction starves the airend and raises discharge temp.
- 4Reinstall and log
Reinstall the new element, snug clamp evenly, log hours and restriction reading for trending.