California Air Tools SMART series (20040SM / 20040SMAD / 20040DSMAD)
Twin-pump 4 hp oil-free package with an electronic SMART controller, hour tracking and (on AD models) an automatic tank drain, aimed at clean-air duty in occupied spaces.
Type
Oil-less reciprocating
Power
4.0 hp, 220 V 60 Hz single-phase
Flow
12.80 cfm @ 40 psi, 10.6 cfm @ 90 psi
Pressure
Up to 125 psi, 20-gallon steel tank
Cooling
air
Drive
direct
Lubrication
oil-less
Models
20040SM, 20040SMAD, 20040SPCAD, 20040DSMAD, 20040DSMADC
Sound level
~75 dB(A) open frame; lower in the soundproof-cabinet (SPC) versions.
Starter
220 V single-phase with the SMART control board driving the motor contactor.
Integrated dryer
Dry-air variants advertise an integrated 80–98 % air dryer.
Typical applications
- Dental and medical office air
- Cabinet and finish shops
- Labs and clean-air work
- Any occupied space that cannot take an industrial recip
Specs & intervals below are from publicly published OEM literature and long-standing field practice. Torque values, exact revision-dated part numbers, and safety-critical settings vary by serial number — always cross-check the unit’s OEM manual and nameplate before ordering parts or performing service.
Fluid
Spec: None — oil-free twin-pump design
Change interval: N/A (oil-free)
Wear parts
| Category | Interval | Source |
|---|---|---|
| Intake filter elements (one per pump head) | 200 hours or on restriction | |
| Automatic drain valve (AD models) | Test monthly; clean the strainer annually | |
| Piston cup / cylinder kits | ~3,000 hours per pump | |
| Check valves | Inspect annually | |
| Dryer desiccant / refrigerated module (D models) | Per the dryer's own schedule |
Consumable part numbers change by revision and region — pull the current number from the OEM portal.
Preventive maintenance
Daily
- Confirm the automatic drain cycled
- Check delivered pressure against the SMART display
- Listen for a pump running noticeably louder than its twin
Monthly
- Manually test the auto drain
- Check the intake filters
- Verify the safety relief valve
Annual / 200 hr
- Replace intake filters
- Clean the cabinet air path and cooling fans
- Verify cut-in/cut-out and hour meter against the controller
- Inspect the contactor contacts
Common faults & first checks
- One pump not starting — contactor or motor winding on that head; capacity halves and run time doubles
- Auto drain not discharging — plugged strainer or a failed drain solenoid
- SMART display showing overtemperature — blocked cabinet airflow or a jammed cooling fan
- Long recovery time — worn piston cups, filter restriction, or a leaking check valve
Controller(s)
- California Air Tools SMART Controller — Backlit digital panel with membrane keypad and status LEDs
Strengths
- Real CFM (10.6 @ 90) with no oil
- Programmable SMART controller with hour tracking and auto drain
- Soundproof-cabinet and integrated-dryer options
- Suits medical/dental clean-air rules
Weaknesses
- 220 V single-phase only
- Expensive versus an industrial oil-lubed recip of the same CFM
- Oil-free pumps still wear; plan on rebuild kits
- Parts are brand-specific
Field notes
Ratings taken from the published 20040SMAD owner's manual and product page. Model suffixes change the cabinet, dryer and drain — check the data plate before ordering parts.