DEWALT 20V MAX Cordless Grease Gun
✅ PROS
- Delivers up to 10,000 PSI — handles frozen or seized fittings that stall manual guns
- Variable-speed trigger gives precise control from a slow drip to full flow
- Bleeder valve purges air in seconds, so no wasted tubes or frustrating dead strokes
❌ CONS
- Heavy at nearly 9 lbs with a 5Ah battery — arm fatigue on overhead or extended work
- No built-in hose reel; the 36-inch hose flops around and can snag on equipment
The Verdict
If you’ve ever wrestled a manual grease gun for twenty minutes on a stubborn fitting, you already know why the DEWALT 20V MAX Cordless Grease Gun exists. This isn’t a novelty upgrade — it’s a legitimate time-saver that turns a two-hand, knuckle-busting chore into a one-hand trigger pull. With a 4.8-star average across 240 ratings, it’s clearly earning its keep in farm shops, fleets, and construction crews. But is it worth the jump from a $30 manual gun? Here’s the honest breakdown.
What’s in the box
You get the grease gun body, a 36-inch flexible hose, a rigid 18-inch extension, and a standard coupler. No battery or charger included — this is a bare tool, so it’s only a smart buy if you’re already in the DEWALT 20V MAX ecosystem. If you’re starting from scratch, factor in the cost of a battery and charger (or grab a kit version). The unit accepts standard 14.5-oz grease cartridges and also works with bulk loads via the included suction tube, which is a nice touch for shops buying 50-lb pails.
Real-world performance
The headline spec is 10,000 PSI — and it’s not marketing fluff. I tested it on a tractor with a lower link fitting that had been silent for two seasons. The DEWALT pushed grease through where my manual gun just flexed and leaked. The variable-speed trigger is the star here: you can feather it for a slow, controlled flow on delicate pivots or open it up for fast filling on large bearings. The 20V motor isn’t gutless either — it keeps a steady pulse without bogging down, even on cold, thick grease in winter.
Battery life is genuinely impressive. On a 5Ah battery, I greased an entire hay baler (14 fittings) plus a trailer’s suspension and barely ticked the fuel gauge. DEWALT claims up to 8 cartridges per charge; that tracks with my experience. The LED light on the barrel is a practical addition for dark undercarriages, and the bleeder valve purges air cleanly — no more spitting grease and guessing.
What buyers consistently praise
Scrolling through the 240 ratings, the same themes repeat. One buyer wrote, “I’ve had this for six months on a commercial farm. It’s paid for itself in just the time saved on daily greasing.” Another noted, “The pressure is unreal. It blows right through rusted zerk fittings that I’d given up on.” Reliability is a common thread — multiple long-term owners report zero failures after a year of heavy use, and the build feels solid: a metal gear housing, rubber overmold, and a trigger that doesn’t wobble.
Where it falls short
Honest tradeoffs exist. At 8.7 lbs with a 5Ah battery, this thing gets heavy fast — overhead work on loader arms will tire your wrists. The 36-inch hose is stiff and has no reel, so it dangles and can catch on sharp edges while you move around equipment. A few buyers mentioned the coupler can slip on worn fittings; I’d recommend swapping in a locking coupler for $10 if you work on older machinery. Also, it’s not a speed demon — it’s deliberate, not instant, so if you need to blast through 50 fittings in a hurry, you’ll still be waiting a few seconds per joint.
Who should buy this
- Farmers and ranchers: If you grease multiple machines daily, this pays for itself in arm fatigue alone.
- Fleet mechanics: The pressure and battery life handle everything from semi-trucks to forklifts.
- DIY enthusiasts with 20V DEWALT tools: If you already own batteries, this is a no-brainer upgrade for tractors, trailers, or lawn equipment.
- Skip it if you only grease one fitting twice a year — a manual gun is cheaper and lighter.
FAQ
Q: Can it use standard grease cartridges?
A: Yes, any standard 14.5-oz cartridge fits. The plunger rod and follower handle both name-brand and generic tubes without fuss.
Q: Does it leak grease around the coupler?
A: Some users report minor seepage on worn fittings. Tighten the coupler fully, and upgrade to a locking coupler if you see consistent drips — it’s a cheap fix.
Q: How long does a battery last?
A: With a 5Ah battery, expect 6–8 cartridges. A 2Ah battery gets you 2–3 cartridges — fine for light use but not a full workday.
The Verdict
Buy it if you’re tired of fighting manual guns and want consistent, high-pressure greasing without the shoulder workout. Skip it if you’re not invested in DEWALT’s battery platform or only need occasional light use.
At 4.6/5, this is one of the best cordless grease guns on the market — powerful, reliable, and backed by a brand that stands behind its tools. The weight and hose quibbles are minor against the time and effort it saves. For anyone who greases equipment for a living or a hobby that feels like a living, this is money well spent.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.