Greasing pins, bushings, and bearings on heavy equipment is brutal on a cheap grease gun. Clogged ports, stiff Zerk fittings, and high back pressure will overwhelm a flimsy lever gun fast, and a gun that cannot build real pressure leaves your pivot points starved and grinding. The right grease gun for an excavator, skid steer, tractor, or backhoe has to push thick NLGI 2 grease through cold lines, hold pressure against a stubborn fitting, and survive being dropped in the dirt day after day.
We looked at cordless, pneumatic, and heavy duty manual guns across pressure output, flow rate, coupler quality, and how well they handle frozen or partially blocked fittings. Below are our seven picks for greasing heavy equipment, ranked best first, with the honest weak spots of each so you know exactly what you are buying before you grab a tube of grease.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Milwaukee M18 2-Speed Cordless Grease Gun (2646-20) Best Overall 18V cordless, up to 10,000 PSI, two-speed flow, 16 oz cartridge or bulk fill |
9.5 | 🛒 Check Price |
 |
Lincoln 1162 PowerLuber 14.4V Cordless Grease Gun Pro Shop Favorite 14.4V cordless, up to 7,500 PSI, around 10 oz per minute flow, 14 oz cartridge or bulk |
9.3 | 🛒 Check Price |
 |
Lincoln 1134 Heavy Duty Lever Action Grease Gun Best Manual Manual lever, up to 7,500 PSI, 14 oz cartridge or bulk fill, three-way loading |
9.1 | 🛒 Check Price |
 |
DEWALT 20V MAX Cordless Grease Gun (DCGG571M1) Best for DeWalt Users 20V MAX cordless, up to 10,000 PSI, around 5 oz per minute flow, 42 inch hose |
9.0 | 🛒 Check Price |
 |
Ingersoll Rand 5380 Air-Powered Pneumatic Grease Gun Best Pneumatic Air-powered, up to 6,000 PSI, around 90 to 145 PSI air inlet, 1/8 inch NPT |
8.7 | 🛒 Check Price |
 |
Lincoln 1162 Bundle With Locking Coupler and Whip Hose Kit Best Coupler Upgrade Locking grease coupler rated to 10,000 PSI plus heavy duty whip hose, universal 1/8 NPT |
8.5 | 🛒 Check Price |
|
LockNLube Grease Gun Coupler and Heavy Duty Pistol Grip Gun Best No-Mess Locking coupler to 10,000 PSI, leak-free seal, fits standard 1/8 inch NPT grease guns |
8.2 | 🛒 Check Price |
1. Milwaukee M18 2-Speed Cordless Grease Gun (2646-20): Best Overall
For a shop or operator already running Milwaukee M18 tools, this is the grease gun to beat for heavy equipment. The two-speed motor is the standout feature, letting you prime a fresh cartridge or move bulk grease quickly in low speed, then drop into high speed where it can push toward 10,000 PSI to force grease through a neglected bushing that has gone bone dry. On excavator pins, skid steer pivots, and loader bucket joints, that pressure is the difference between a fitting that actually takes grease and one that just sits there clogged. The locking coupler grips Zerk fittings firmly and the LED makes finding ports under a machine far easier at dawn or in a dim bay.
The honest weakness is bulk. With an M18 battery hung off the back, this gun is long and front heavy, and threading it into the cramped fitting locations on a mini excavator or compact track loader takes patience and sometimes a whip hose. It is also noticeably heavier to hold overhead than a slim manual gun. If most of your greasing is on full-size equipment with accessible fittings, the weight is a non-issue, but operators servicing tight machinery should plan to add a flexible extension hose.
- Two-speed pump lets you prime fast then switch to high pressure for stubborn fittings
- Builds up to 10,000 PSI to break loose dry pins and bushings on excavators and loaders
- LED light and fuel gauge plus runs on the same M18 batteries as the rest of the fleet
Pros: Massive pressure handles hardened heavy equipment fittings other guns choke on; Two-speed control gives both fast fill and slow high-pressure delivery; Shares M18 batteries so no extra charger system to manage on the job
Cons: Battery and gun are bulky to maneuver into tight pivot points on compact machines; Heavier than a slim manual gun for all-day overhead work
2. Lincoln 1162 PowerLuber 14.4V Cordless Grease Gun: Pro Shop Favorite
The Lincoln PowerLuber name carries real weight among diesel mechanics and ag techs, and the 1162 earns it. This is a no-drama cordless gun built for the kind of repetitive greasing that destroys lesser tools, the daily walk-around on a fleet of trucks, tractors, and earthmovers. The included 30 inch flexible hose is the unsung hero here, letting you snake the coupler onto a fitting tucked behind a track frame or under a combine head while keeping the gun body in a comfortable position. With two batteries and a charger in the kit, a service route rarely gets interrupted by a dead pack.
The trade-off compared to our top pick is pressure ceiling. At roughly 7,500 PSI it still clears the vast majority of heavy equipment fittings, but a truly seized, rock-hard bushing may resist it where a 10,000 PSI gun powers through. The 14.4V platform is also its own ecosystem, so unless you already own Lincoln cordless tools you are committing to another battery and charger. For dedicated lube service work, that is a fair price for a gun this dependable.
- Proven PowerLuber pump trusted across fleet maintenance and ag service for years
- 30 inch flexible whip hose reaches buried fittings on dozers and combines
- Comes with two batteries and a charger so one is always greasing while one charges
Pros: Reputation for surviving years of daily fleet abuse; Long whip hose reaches awkward fittings without contorting the gun; Two-battery kit keeps you working through long service routes
Cons: Tops out lower on pressure than the Milwaukee two-speed; 14.4V platform is its own battery system separate from most power tool lineups
3. Lincoln 1134 Heavy Duty Lever Action Grease Gun: Best Manual
When there is no power outlet, no air compressor, and a battery is the last thing you want to babysit on a remote jobsite, a heavy duty lever gun is the answer, and the Lincoln 1134 is the benchmark. The long lever gives genuine mechanical advantage, letting a strong arm push thick NLGI 2 grease to around 7,500 PSI, which is enough to service excavator and tractor fittings that would stall a discount gun. The three-way loading is a real field convenience, so whether you have cartridges, a bulk pail, or just need to suction-fill, you are covered. The steel barrel and forged head feel like they will outlive several machines.
The downside is simply the nature of a manual gun. Greasing a piece of equipment with dozens of fittings is a two-hand, pump-pump-pump grind, and your forearm will tell you about it by the end of a heavy route. For a few fittings or as a reliable backup to a cordless gun, it is close to perfect. For all-day production greasing across a fleet, you will eventually want a powered tool to save your hands.
- Develops up to 7,500 PSI by hand with strong leverage for heavy grease
- Three-way loading takes cartridge, bulk, or suction fill in the field
- Heavy steel barrel and forged head built to outlast the machine you grease
Pros: No batteries or air supply needed, always ready in the field; High hand pressure for a manual gun clears tough fittings; Rugged steel build shrugs off drops and grit
Cons: Two-hand operation is slow over a long greasing route; Hand fatigue sets in on high-count fitting jobs
4. DEWALT 20V MAX Cordless Grease Gun (DCGG571M1): Best for DeWalt Users
If your shop already lives on the DeWalt 20V MAX platform, this grease gun slots right in and brings serious capability. It pushes up to 10,000 PSI, putting it in the same pressure class as our top pick, which means seized and clogged fittings on heavy equipment are well within its reach. The 42 inch hose is one of the longest in the class and comes with an inline filter and air bleeder valve, both genuinely useful when you are forcing grease into deep undercarriage points and need to purge air to keep flow consistent.
Where it gives ground is speed. This is a single-speed gun, so it pumps grease at a steadier but slower rate than the two-speed Milwaukee, and on a long fitting count you will feel those extra seconds add up. The gun body is also on the larger side, so the same tight pivots that challenge other cordless units will challenge this one too. For DeWalt owners who value pressure and hose reach over raw speed, it is an easy and logical choice.
- Reaches up to 10,000 PSI to dislodge clogged and dry fittings
- Long 42 inch high-pressure hose with a filter and air bleeder valve
- Runs on the widely owned 20V MAX battery platform
Pros: High pressure ceiling matches premium guns; Very long hose reaches deep fittings on big iron; 20V MAX batteries are common in many shops already
Cons: Single-speed pump moves grease slower than two-speed rivals; Body is large and awkward in tight engine and undercarriage spaces
5. Ingersoll Rand 5380 Air-Powered Pneumatic Grease Gun: Best Pneumatic
For a maintenance bay with a good compressor, a pneumatic gun like the Ingersoll Rand 5380 changes the rhythm of greasing. There is no battery to charge or die, so as long as the air is on you can grease fitting after fitting without pausing, which makes it excellent for a shop cycling machines through scheduled service. It builds up to 6,000 PSI of steady delivery and the compact pistol-grip body is genuinely easy to maneuver around an engine bay or up onto a deck, lighter and less unwieldy than the big battery guns.
The obvious limitation is the air hose tether. This gun is only as mobile as your compressor and line reach, so it is a bay tool, not something you take out to a stranded machine in a field. Its 6,000 PSI ceiling is also below the 10,000 PSI heavy hitters, so a truly stubborn dry bushing may need a few more pumps or a manual assist. Inside a shop with air on tap, though, the convenience and continuous run time are hard to beat.
- Runs off shop air for tireless continuous greasing with no battery to die
- Develops up to 6,000 PSI for steady delivery into heavy equipment fittings
- Compact pistol grip body is easy to handle around a machine
Pros: Never runs out of charge as long as the compressor is running; Light and quick for high-volume bench and bay greasing; Simple, durable air motor with few parts to fail
Cons: Tethered to an air hose, so it is bay-bound not field-portable; Lower pressure ceiling than the top cordless guns
6. Lincoln 1162 Bundle With Locking Coupler and Whip Hose Kit: Best Coupler Upgrade
Ask any heavy equipment mechanic what ruins greasing day and the answer is usually the coupler popping off a fitting mid-pump, spraying grease everywhere. A quality locking coupler and whip hose kit, like the Lincoln-style locking coupler rated to 10,000 PSI, fixes that single most common frustration. The locking jaws clamp onto the Zerk and stay put under full pressure, freeing your second hand and keeping grease where it belongs. The universal 1/8 inch NPT thread means it bolts onto practically any gun in your kit, instantly upgrading an older lever or cordless gun that came with a weak push-on coupler.
It is worth being clear that this is an accessory rather than a gun, so it earns its spot here as the upgrade that makes every other gun on this list work better on heavy equipment. The one quirk is that the locking mechanism can be a little fiddly to pop off when fittings are bunched tightly together, and you occasionally fight the release lever in cramped spots. For the dramatic reduction in slip-offs and wasted grease, that minor annoyance is well worth living with.
- Locking coupler grips the Zerk and frees both hands for the pump
- Rated to 10,000 PSI so it keeps up with high-pressure cordless guns
- Universal 1/8 inch NPT thread fits virtually any grease gun you own
Pros: Eliminates the constant slipping of a standard push-on coupler; Handles full pressure without blowing off the fitting; Upgrades a gun you already own instead of buying new
Cons: It is an accessory, not a standalone gun; Locking jaws can be fiddly to release on crowded fitting clusters
7. LockNLube Grease Gun Coupler and Heavy Duty Pistol Grip Gun: Best No-Mess
The LockNLube coupler has become a near cult favorite among equipment operators for one simple reason, it locks on and seals so grease goes into the fitting and not down your arm and the machine frame. Rated to 10,000 PSI, it keeps pace with the most powerful cordless guns and handles the high back pressure of dry heavy equipment bushings without blowing off. The flip-lever release lets you disconnect cleanly with no string of grease trailing behind, which over a long service route adds up to a much tidier job and far less wasted product.
The compromise is the head size. The locking mechanism makes for a chunkier coupler than a bare push-on tip, so on fittings that sit deep in a recessed bore it can be a struggle to seat squarely. It also adds a bit of length to the working end of whatever gun it is mounted on. For the vast majority of accessible Zerks on excavators, loaders, and trailers, none of that matters, and the clean, locked, leak-free connection makes greasing far less of a chore.
- Patented locking jaws lock on and seal without grease blowback
- Rated to 10,000 PSI to match the highest pressure heavy equipment fittings
- Releases cleanly with a flip lever so no grease drips down the machine
Pros: Genuinely leak-free connection that stops messy blowback; Locks on hard-to-reach fittings so both hands stay on the gun; Fits standard guns so any rig can be upgraded
Cons: Bulkier head can struggle to seat on deeply recessed fittings; As an upgrade part it adds length to the end of the gun
Frequently Asked Questions
How much pressure does a grease gun need for heavy equipment?
For heavy equipment you want a grease gun capable of at least 6,000 PSI, and ideally up to 10,000 PSI, because pins, bushings, and bearings on excavators, loaders, and tractors run high back pressure and often sit dry between services. Lower pressure economy guns can stall against a clogged or neglected fitting and leave the joint starved. A 10,000 PSI cordless gun like the Milwaukee M18 or DeWalt 20V gives you the headroom to break loose a stubborn fitting that a weaker gun simply cannot move, while a quality manual lever gun around 7,500 PSI handles most routine fittings just fine.
Should I choose a cordless, pneumatic, or manual grease gun for equipment?
It comes down to where you work. Cordless guns are the most multi-purpose for fleet and field service because they go anywhere, build high pressure, and free your hands, which is why they top this list. Pneumatic guns are ideal in a fixed maintenance bay with shop air, since they never run out of charge and run all day, but they are tethered to a hose. Manual lever guns shine as a remote backup and on jobs with no power or air, though they are slow and tiring over a long fitting count. Many serious shops keep a cordless as the daily driver and a manual gun in the truck for emergencies.
What grease should I use in the gun for heavy equipment?
Most heavy equipment fittings call for an NLGI grade 2 lithium complex or moly-fortified grease, since moly (molybdenum disulfide) is excellent for the high-load, low-speed pins and bushings found on construction machinery. Always check the operator manual for the machine, as some hydraulic and slew bearings want a specific spec. Cold weather can thicken NLGI 2 grease and raise pump effort, so in deep winter a slightly lighter NLGI 1 may flow better. Whatever you choose, stay consistent, because mixing incompatible grease types can cause them to separate and lose protection.
Why does my grease gun coupler keep popping off the fitting?
A standard push-on coupler relies only on friction against the Zerk, so when back pressure climbs on a hard-to-fill heavy equipment fitting it blows off and sprays grease. The fix is a locking coupler such as the LockNLube or a Lincoln locking coupler, both rated to 10,000 PSI, which clamp onto the fitting with mechanical jaws and stay sealed under full pressure. Upgrading the coupler is one of the cheapest, most impactful improvements you can make to any grease gun, and it works on guns you already own thanks to the universal 1/8 inch NPT thread.
How do I get grease into a clogged or seized fitting?
First confirm the gun is primed and the air is bled out of the hose, since trapped air feels like a blockage. If the fitting still will not take grease, switch to a high-pressure gun and a locking coupler so you can apply steady force without the coupler slipping. Sometimes a few firm pulses break the plug loose. If it remains seized, the Zerk fitting itself is likely clogged with hardened grease or dirt and should be removed and cleaned or replaced, which is cheap and quick. Never hammer a fitting under extreme pressure, as you can damage the bore or the gun.
Our Verdict
For greasing heavy equipment, the Milwaukee M18 2-Speed Cordless Grease Gun is our top pick thanks to its 10,000 PSI ceiling, genuinely useful two-speed pump, and the convenience of sharing M18 batteries across the fleet. The Lincoln 1162 PowerLuber is the runner up and an outstanding choice for dedicated lube service, with a battle-proven pump, a long whip hose, and a two-battery kit that keeps you greasing through the longest routes. Whichever gun you choose, add a locking coupler like the LockNLube or a Lincoln locking unit, because it stops the blow-off frustration and makes every gun on this list far better in the field.
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