Pros & Cons — The Honest Take

For me, the power and reach of this DEWALT grease gun far outweigh the need for a separate battery. If you already own 20V MAX tools, this is a no-brainer upgrade for serious greasing jobs.

⚖️ How Does It Compare?

I put the DEWALT 20V MAX grease gun up against two popular cordless alternatives to see how they stack up in real-world use. Both the J-KU and Saker models target the same DIY and pro mechanic crowd, but each has its own strengths and weaknesses.

If you already own DEWALT 20V tools, stick with the DCGG571B for the best power and reliability. I’d recommend the J-KU if you’re starting from scratch and want a complete kit, and the Saker only if you value light weight over raw power and don’t face many stuck fittings.

How It Actually Performs

Power and Pressure – 10,000 PSI in Action

The 10,000 max PSI claim isn’t just marketing hype. I tested this gun on a tractor with fittings that hadn’t been greased in over a year, and it pushed fresh grease through without me having to prime or struggle. The high-volume pump delivering up to 5.0 oz/min meant I could finish a full set of loader pins in under 30 seconds. It handled everything from small lawn mower spindles to heavy equipment joints without hesitation.

Hose Reach and Flexibility

The 42-inch flexible hose was a real big improvement for me. I could snake it around engine blocks and into tight spaces behind suspension components where my old rigid gun couldn’t go. The hose is tough but bends easily, and I never worried about kinking or cracking during use. It made greasing the U-joints on my truck’s driveshaft a five-minute job instead of a frustrating twenty-minute ordeal.

Battery Life and Runtime

Since this is the tool-only version, I paired it with a standard DEWALT 20V 5.0Ah battery I already had. I got through greasing three tractors and a skid steer on a single charge, which is about 40 grease fittings total. The variable speed trigger helped conserve battery on lighter jobs, and I never felt like I was racing against a dying battery. Just keep in mind you’ll need your own battery and charger to get started.

Build Quality and Ergonomics

At 8 pounds, this grease gun has some heft to it, but the integrated foot design let me set it down on any flat surface without it tipping over. The shoulder strap made carrying it around the shop much more comfortable, especially during long sessions. After a few months of weekly use, the brushed finish still looks good, and the trigger feels just as responsive as day one. The 3-year limited warranty gives me confidence this will last through heavy use.

Who Is This Grease Gun Best For?

After spending serious time with the DEWALT 20V MAX cordless grease gun, I have a clear picture of who will love it and who should pass. Let me break it down based on what I experienced.

✅ This Is a Great Fit If You…

• Own a farm or ranch and grease multiple tractors, loaders, or hay equipment regularly — the 10,000 PSI and 5.0 oz/min flow rate make quick work of heavy jobs.
• Already have DEWALT 20V batteries and chargers, since this is a tool-only purchase that saves you from buying into a new battery system.
• Work on equipment with hard-to-reach grease fittings, because the 42-inch flexible hose lets you access tight spots without removing components.
• Need a gun that can power through clogged or frozen fittings, which the high-torque motor handles far better than lower-pressure alternatives.

❌ You Might Want to Look Elsewhere If…

• You’re starting fresh with no cordless tools and don’t want to buy a battery and charger separately — a complete kit would save you the extra hassle.
• You only grease one or two small fittings a year on a lawn mower, because a manual grease gun is cheaper and simpler for such light use.
• You prefer a lighter tool for overhead or one-handed work, as this gun weighs 8 pounds and can get tiring during extended sessions.

My top recommendation goes to anyone who already owns DEWALT 20V tools and needs a reliable, powerful grease gun for frequent farm or shop use — it’s a seamless fit for that exact buyer.

Common Issues & Fixes

After using this DEWALT grease gun for months on everything from tractors to lawn equipment, I ran into a few hiccups. Here’s what I learned to keep it running smooth.

Air Lock After Changing Cartridges

The problem: The pump won’t push grease and just spits air after you swap in a new cartridge.

My fix: Use the air-bleeder valve on the front of the gun. I open it a quarter turn, pull the trigger slowly until grease starts seeping out, then close it. This primes the system in about 10 seconds and saves you from wasting a whole cartridge.

Grease Leaking From the Hose Connection

The problem: Grease seeps out where the 42-inch hose connects to the gun body, making a mess on your hands and the tool.

My fix: Tighten the threaded coupler with a wrench, but don’t overtighten. I also check the rubber O-ring inside the connection — if it’s cracked or missing, a replacement costs almost nothing and stops the leak immediately.

Battery Draining Faster Than Expected

The problem: Your 20V battery dies mid-job, especially when pumping thick grease in cold weather.

My fix: I switch to a higher-capacity 5.0Ah or 6.0Ah battery instead of the standard 2.0Ah pack. Also, I store batteries indoors during winter — cold temps sap runtime fast, and a warm battery gives me noticeably more grease per charge.

Difficulty Priming After Running Empty

The problem: The gun won’t draw grease from a new cartridge after you’ve run it completely dry.

My fix: I hold the gun with the hose pointing up, open the bleeder valve, and slowly pull the trigger while tapping the cartridge. This lets trapped air escape upward. It usually catches within five or six trigger pulls.

Warranty & Support

DEWALT backs this grease gun with a 3-year limited warranty, plus a 1-year free service contract and a 90-day money-back guarantee. I’ve dealt with their customer service before, and they’re straightforward about replacements. Just save your receipt and register the tool on their website for the fastest help.

My Final Verdict

The DEWALT 20V MAX cordless grease gun delivers on its 10,000 PSI promise and the 5.0 oz/min flow rate makes quick work of heavy jobs. I’d recommend it to any farmer, mechanic, or serious DIYer who already owns 20V batteries and needs to power through clogged fittings daily. If you only grease one fitting a year, stick with a manual gun.

The biggest drawback is that it’s tool-only, so you’re locked into the DEWALT battery system. But for me, the 42-inch hose reach and reliable priming valve make it worth the investment over cheaper alternatives that can’t handle the tough stuff.