CKMTA12-24 Twin On-Board Air Compressor 12V 24V 174 L/min

How we label data. Confirmed values are read from supplied stock and from the published data of this compressor family; reference values are published marketplace specifications and are shown for identification only; anything not published is withheld rather than guessed. Airflow and current figures are for the twin on-board configuration.

A twin on-board air compressor is the fastest way to put air back into big tyres without opening a workshop. The CKMTA12-24 twin compressor packs two sealed motors and two cylinders into a body small enough to mount under a bonnet, in a canopy or in a drawer, and the same hardware can be supplied as a self-contained on-board air system case kit with its own air tank, hose and battery-clamp lead.

Free airflow is the headline: up to 174 L/min at zero pressure, falling to roughly 132 L/min at 200 kPa, enough to bring a 4×4 tyre back to road pressure in a fraction of the time a single-cylinder pump needs. The twin motors are internally thermally protected and the unit is rated as a 100% duty cycle compressor, so a 174 L/min air compressor of this size can keep running while you work through a set of tyres.

Voltage is the other decision. The 12V 24V twin compressor family covers both passenger 4x4s and 24V trucks and buses, with the 24V version drawing about half the current for the same airflow. Every kit includes a full wiring loom with a sealed relay and a heavy-duty maxi fuse for each motor, a pressure switch that cuts out between 135 and 150 PSI, a dash switch, splash-resistant intake filters and a multi-position mounting bracket that also makes it a viable air locker compressor.

For accessory shops and fleet workshops the unit sells three ways: as a heavy duty air compressor for tyre work, as a twin motor air compressor for 4×4 tire inflation and small air tools, and with the tank fitted as a complete air tank and hose kit. A 24V truck air compressor version keeps the same airflow and 100% duty cycle for bus and truck fleets, and the portable case build turns the same hardware into a shop-away kit.

Searches like “rde-arb-ckmta12”, “arb ckmta12” lead straight to this unit, and CKMTA12-24 is what they resolve to for 4×4, SUV, pickup, overland and fleet vehicles (12V DC or 24V DC, select version).

Requests worded as “arb 12v twin air compressor ckmta12” come from buyers comparing this twin cylinder on-board air compressor (portable case kit) against what is already fitted for 4×4, SUV, pickup, overland and fleet vehicles (12V DC or 24V DC, select version).

Reference / cross-reference numbers are published listings and are shown for identification only; they are not claims of origin or authorization.

• CKMTA12-24 — Listing model covering the 12V and 24V twin versions
• CKMTA12 — Published 12V twin on-board compressor class reference (identification only)
• CKMTA24 — Published 24V twin on-board compressor class reference (identification only)
• 174 L/min class — Published free-airflow band for a twin on-board compressor of this size
• 135-150 PSI pressure switch — Published cut-out band for this compressor class
• 4.0 L air tank class — Published tank size used with this compressor class for air tools (reference only)

• Twin motor, twin cylinder on-board air compressor with two sealed, ball-bearing motors.
• Up to 174 L/min free airflow and approximately 132 L/min at 200 kPa.
• 100% duty cycle, so the compressor does not need a cool-down between tyres.
• 150 PSI pressure switch cuts in and out between about 135 and 150 PSI.
• Integral over-pressure safety valve plus one heavy-duty maxi fuse per motor.
• Internal thermal protection in both motors against extreme temperature damage.
• Splash-resistant intake filters and hard-anodised cylinder bores for long service life.
• Supplied either as a mounted on-board kit or as a portable case kit with air tank, hose and clamps.

• Compressor does not start when the dash switch is pressed.
• One motor runs and the other stays silent, so airflow halves.
• Pressure switch fails to cut out and the pump runs continuously.
• Blown maxi fuse or an overheated relay in the wiring loom.
• Loud knocking from a cylinder head under load.
• Air leak at the quick-connect coupling, hose tail or pressure-switch thread.
• Water or oil mist in the air line, pointing to a saturated intake filter.

• 1Confirm the version: 12V for most 4x4s, 24V for trucks and buses — never mix.
• 2Mount the compressor on a dry, ventilated, vibration-isolated surface using the bracket.
• 3Route the heavy-gauge loom away from exhaust and heat, then fit the sealed relay and the maxi fuse for each motor.
• 4Wire the dash switch and pressure switch per the guide, then check every joint and thread for leaks.
• 5Run the unit in, confirm the cut-in and cut-out pressures, then secure the intake filters and hose.
• 6For the case kit, connect the tank and hose, pressure-test the assembly and fit the drain cock before regular use.

• Air tanks and receiver kits
• Coil air hoses and quick-connect couplings
• Tyre pressure gauges and inflation kits
• Replacement pressure switches, relays and maxi fuses
• Splash-resistant air filters and service parts
• Tyre deflators and tyre repair kits