Makita MAC Big Bore portable series
Oil-lubricated cast-iron portable range built for nailer-driven jobsite work, with a quiet oil-free sub-line for finish trades.
Type
Single-stage reciprocating
Power
1.0–5.5 hp (120 V on most, gas engine on MAC5501G)
Flow
2.0 cfm @ 90 psi (MAC210Q) to 6.5 cfm @ 90 psi (MAC5200)
Pressure
130–140 psi maximum tank pressure
Cooling
air
Drive
belt-or-direct
Lubrication
oil-lubricated
Models
MAC100Q, MAC210Q, MAC2400, MAC5200, MAC5501G
Sound level
60 dB (Quiet series) to ~90 dB (MAC5200 belt-drive).
Starter
Pressure switch with unloader; MAC5200 uses a low-amp draw motor to avoid breaker trips.
Typical applications
- Framing and roofing nailers
- Trim work (Quiet series)
- Two-nailer crews
- Jobsite service air
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: SAE 30 non-detergent compressor oil (or the Makita-specified synthetic)
Capacity: Small — check the sight glass, typically under 12 oz
Change interval: Every 200–300 hours or annually
Cast-iron Big Bore pumps are oil-lubricated. Running one dry destroys it in minutes.
Wear parts
| Category | Interval | Source |
|---|---|---|
| Crankcase oil | 200–300 hr | |
| Intake filter | 100 hr or on visible loading | |
| Reed valve / valve plate set | Inspect at 1,000 hr | |
| Belt (MAC5200) | Check tension quarterly | |
| Check valve and pressure switch | Replace on failure |
Consumable part numbers change by revision and region — pull the current number from the OEM portal.
Preventive maintenance
Daily
- Check crankcase oil level
- Drain tank moisture
- Listen for valve tick / knock
- Verify unloader operates on cut-out
Every 500 hr
- Change crankcase oil (mineral) or verify PAO/synthetic at manufacturer interval
- Clean or replace inlet filter
- Check belt tension & sheave alignment
- Torque head bolts to spec if any weeping
Annual / 2,000 hr
- Pull head; inspect reed/disc valves and seats
- Check ring gap and cylinder wear
- Torque head bolts to OEM spec in cross pattern
- Test safety valve
- Inspect crankshaft & rod bearings on splash-lube units
Every 4–6,000 hr
- Top-end rebuild (rings, valves, gaskets)
- Inspect rod bearings and crank end play
- Verify aftercooler condensate drain
Common faults & first checks
- Won't build past ~90 psi — worn reed valves or a leaking check valve
- Oil in the discharge air — overfilled crankcase or worn rings
- Breaker trips on start — extension cord too long or too light
- Pump knock — low oil or a worn rod bearing
Strengths
- Cast-iron Big Bore pump lasts far longer than aluminium oil-free pumps
- Good recovery for the size
- Low-amp draw motors start on 15 A circuits
Weaknesses
- Oil changes required
- Heavier than oil-free equivalents
- Loud on the belt-drive frames
Field notes
Published Makita spec-sheet figures. Verify oil type and interval against the unit's own manual.