Milwaukee M18™ Cordless 2-Speed Grease Gun (models like 2646-20, 2646-21CT, 2646-22CT). It’s often described in listings and seller titles as a brushless, fully automatic, high-pressure grease/oil injector gun due to its cordless electric operation and performance features:
🔧 Milwaukee M18™ Cordless Electric Grease Gun — Product Description
The Milwaukee M18™ Cordless 2-Speed Grease Gun is a battery-powered grease injector designed for professionals and heavy-duty maintenance work. It replaces manual grease guns with a high-pressure, automated dispensing solution that makes greasing fittings faster, easier, and more consistent.
Key Features:
✔ Cordless brushless performance: Powered by an 18 V M18™ REDLITHIUM™ battery, giving strong and consistent output without cords or air hoses.
✔ High pressure output: Delivers industry-leading up to 10,000 PSI max operating pressure, able to handle tough grease points.
✔ Two-speed design: Offers selectable high pressure or high flow, so you can optimize grease delivery for different fittings and jobs.
✔ Automatic dispensing: The electric drive provides continuous grease flow with a lock-on trigger so you don’t have to pump manually.
✔ Pre-set grease counter: Lets you preset how much grease is dispensed, improving precision and avoiding over-greasing.
✔ Flexible reach: Comes with a ~48″ high-pressure flexible hose so you can access hard-to-reach grease zerks easily.
✔ LED light & ergonomic design: Built-in LED helps illuminate dark work areas, and the design reduces user fatigue.
✔ Battery system compatibility: Works with Milwaukee’s M18 battery ecosystem (40+ tools), so batteries/chargers are shared.
Typical Kit Includes
Depending on the bundle:
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Milwaukee M18™ Cordless Grease Gun
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REDLITHIUM™ battery (1–2 pack in kit versions)
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Multi-voltage charger
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Carrying case
(Bare tool options omit batteries/charger)
📌 How It Works
Instead of manually pumping a grease gun, the electric unit uses a motor-driven piston to force grease through the hose and coupler. The 2-speed gear box lets you choose:
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High flow for quick filling
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High pressure when you encounter resistance or need precise delivery.
The pre-set grease counter feature ensures you deliver the same amount of grease each time — useful for maintenance charts and service schedules.