The Milwaukee 2646-20 M18 2-Speed Grease Gun is a professional cordless lubrication tool designed for heavy-duty machinery maintenance, automotive servicing, construction equipment, agricultural machinery, and industrial applications.
It uses Milwaukee’s 18V M18 battery platform and provides convenient cordless operation for reaching grease fittings where manual pumping or compressed-air equipment may be less practical. Its 2-speed design helps users control grease delivery according to the lubrication requirement.
The Milwaukee 2646-20 is a bare-tool model, so the M18 battery and charger are sold separately. It is a suitable choice for mechanics, maintenance technicians, fleet operators, farmers, construction professionals, and industrial maintenance teams who already use Milwaukee M18 batteries. For frequent lubrication work, its cordless design can improve mobility and make routine grease-gun maintenance faster and more convenient.
Key Specifications
Feature
Specification
Model
Milwaukee 2646-20
Battery Platform
M18 RED LITHIUM
Voltage
18V
Maximum Pressure
10,000 PSI / 690 bar
Maximum Flow Rate
10 oz/min
Speed Settings
2
Hose Length
48 inches
Barrel Capacity
16 oz bulk / 14.5 oz cartridge
Trigger
Lock-on / Lock-off
LED Light
Yes
Air Bleeder Valve
Yes
Grease Counter
Pre-set grease counter dial
Tool Type
Bare Tool
Warranty
5-year limited warranty
Milwaukee specifies two operating modes: the high-pressure setting reaches 10,000 PSI with a 3.5 oz/min flow rate, while the high-flow setting provides 10 oz/min at 5,000 PSI.
Why It Stands Out ?
1. 10,000 PSI maximum pressure The high-pressure mode is designed for demanding grease fittings where substantial pressure is required.
2. Two-speed operation Switch between maximum pressure and maximum flow, allowing you to prioritize penetration or faster lubrication depending on the application.
3. 48-inch flexible hose The long hose helps technicians reach fittings located in difficult-to-access areas without constantly repositioning the grease gun.
4. Precision grease dispensing The pre-set grease counter dial is designed to help users dispense more consistent quantities of lubricant, which can reduce the risk of under- or over-greasing.
5. M18 battery compatibility If you already own Milwaukee M18 batteries, the bare-tool version can integrate into that battery ecosystem.
Who Can Use the Milwaukee 2646-20?
The Milwaukee 2646-20 is best suited for users who regularly perform heavy-duty lubrication work:
Automotive mechanics – For lubricating vehicle and truck grease fittings.
Industrial maintenance technicians – For machinery and production equipment.
Construction equipment operators – For excavators, loaders, and other heavy machinery.
Agricultural equipment users – For tractors, harvesters, and farm machinery.
Fleet maintenance teams – For regular servicing of commercial vehicles.
Manufacturing facilities – For scheduled lubrication of industrial machines.
Professional service technicians – For mobile and field maintenance.
DIY users – Suitable for experienced users who need high-pressure lubrication.
Best suited for: Professionals and businesses that need fast, high-pressure, cordless grease delivery for frequent maintenance tasks.
Positive & Negative Sentiments
Positive Sentiments
Negative Sentiments
⭐ High 10,000 PSI pressure
❌ Higher price than basic grease guns
⭐ Fast 10 oz/min grease flow
❌ Battery and charger may need separate purchase
⭐ Convenient cordless operation
❌ Relatively heavy for prolonged use
⭐ Two-speed control for better dispensing
❌ M18 battery adds weight
⭐ Excellent for heavy-duty lubrication
❌ May be excessive for occasional light-duty users
⭐ Helps reach difficult grease fittings
❌ Requires battery charging and maintenance
⭐ Strong professional-grade build
❌ Less budget-friendly than manual models
Care & Precautions
Care / Precaution
Recommendation
Clean After Use
Wipe the grease gun and hose to remove dirt and excess grease.
Check Hose & Fittings
Inspect regularly for cracks, leaks, or damage.
Use Correct Grease
Use grease recommended for the equipment and application. Avoid mixing incompatible greases.
Protect From Contamination
Keep the grease cartridge and fittings clean to prevent dirt entering the system.
Battery Care
Remove and store the M18 battery properly when the tool is not in use for extended periods.
Avoid Overpressure
Do not exceed the pressure requirements of the equipment being lubricated.
Inspect Before Use
Check the tool, battery, hose, and coupler before every major lubrication job.
Safe Operation
Wear appropriate eye protection and keep hands away from pressurized grease discharge points.
Storage
Store the grease gun in a clean, dry place away from excessive heat and moisture.
Regular Maintenance
Follow Milwaukee’s recommended maintenance and service instructions for long-term performance.
Milwaukee 2646-20 vs Other Cordless Grease Guns
Feature
Milwaukee 2646-20
DEWALT DCGG581
Makita XPG01Z
Voltage
18V M18
20V MAX
18V LXT
Max Pressure
10,000 PSI
10,000 PSI
10,000 PSI
Max Flow Rate
10 oz/min
9 oz/min
10 oz/min
Speed Control
2-speed
2-speed + variable trigger
2-speed / auto-switching
Hose Length
48 in.
47 in.
47.25 in.
Special Feature
Preset grease counter
Up to 7 tubes/charge*
Automatic flow adjustment
Best For
Precise heavy-duty lubrication
High-flow jobsite work
Heavy machinery & controlled flow
Overall Rank
9/10
9/10
8.5/10
Milwaukee stands out particularly for its preset grease counter, 48-inch hose, 10,000 PSI pressure, and 10 oz/min maximum flow. DEWALT offers similar pressure with slightly lower maximum flow, while Makita matches Milwaukee’s pressure and flow and adds automatic flow adjustment.
Tips for Optimal Use
Choose the correct grease: Use a lubricant recommended for the machine and avoid mixing incompatible greases.
Clean grease fittings first: Remove dirt and debris before connecting the coupler to prevent contamination.
Use the right speed: Select the appropriate speed setting for controlled grease delivery and the lubrication requirement.
Check the grease cartridge: Make sure the cartridge is properly installed and free from contamination.
Keep the hose positioned safely: Avoid sharp bends, crushing, or excessive twisting during operation.
Monitor grease delivery: Stop when the required amount of grease has been applied to avoid over-lubrication.
Maintain the battery: Use a compatible Milwaukee M18 battery and keep it adequately charged for uninterrupted work.
Inspect regularly: Check the hose, coupler, fittings, and tool for wear or leakage before use.
Clean after lubrication: Wipe away excess grease and store the tool in a clean, dry location.
Follow equipment specifications: Always follow the machinery manufacturer’s recommended grease type, quantity, and lubrication interval.
Product Rank
Rank Factor
Rating
Overall Product Rank
9/10
Pressure Performance
9.5/10
Grease Delivery
9/10
Speed & Productivity
9/10
Portability
9/10
Build Quality
9/10
Ease of Use
8.5/10
Value for Professionals
8.5/10
Overall Verdict: Excellent – Best suited for heavy-duty professional and industrial lubrication.
Conclusion
Overall, the Milwaukee 2646-20 is a powerful cordless grease gun for professionals who need reliable, high-pressure lubrication in demanding working environments. Its 10,000 PSI maximum pressure, 10 oz/min flow rate, two-speed control, and M18 battery platform make it suitable for construction equipment, automotive service, agricultural machinery, industrial maintenance, and heavy-duty applications.
The flexible hose and easy cordless operation also help users reach difficult grease fittings without depending on compressed air. While it may be more expensive than basic manual or pneumatic grease guns, its power, mobility, speed, and controlled grease delivery can make it a worthwhile investment for frequent lubrication work.
Best for: Maintenance professionals, mechanics, technicians, fleet operators, and industrial users who need fast and high-pressure cordless lubrication.
FAQs:
1. What is the Milwaukee 2646-20 used for? The Milwaukee 2646-20 is a cordless grease gun used for lubricating vehicles, industrial machinery, construction equipment, agricultural equipment, and other grease-lubricated components.
2. Is the Milwaukee 2646-20 a cordless grease gun? Yes. The Milwaukee 2646-20 is a cordless grease gun powered by Milwaukee’s M18 battery platform, providing portable lubrication without a compressed-air supply.
3. How much pressure does the Milwaukee 2646-20 produce? The Milwaukee 2646-20 is designed to deliver up to 10,000 PSI, making it suitable for demanding heavy-duty lubrication applications.
4. Does the Milwaukee 2646-20 come with a battery and charger? No. The 2646-20 is sold as a bare tool, so the compatible M18 battery and charger must be purchased separately.
5. Is the Milwaukee 2646-20 good for heavy equipment? Yes. Its high-pressure cordless design makes it suitable for equipment such as construction machinery, agricultural machines, trucks, and industrial equipment, provided the equipment’s lubrication requirements are compatible.
6. What type of battery does the Milwaukee 2646-20 use? It uses Milwaukee’s M18 18V battery system. Users who already own compatible M18 batteries can use their existing battery platform.
7. Is the Milwaukee 2646-20 suitable for professional mechanics? Yes. Its cordless operation, high pressure, and controlled grease delivery make it a practical choice for mechanics, maintenance technicians, fleet service teams, and industrial professionals.
8. Is the Milwaukee 2646-20 worth buying? For users who perform frequent, heavy-duty lubrication, the 2646-20 can be a worthwhile investment because it combines cordless mobility, high pressure, and two-speed operation. For occasional lubrication, a manual grease gun may be more economical.
9. Can the Milwaukee 2646-20 replace a manual grease gun? Yes, for many applications. It can significantly reduce manual pumping effort, making it especially useful when many grease fittings must be serviced regularly.
10. Who should buy the Milwaukee 2646-20? It is best suited to professional mechanics, industrial maintenance technicians, construction workers, agricultural equipment users, fleet operators, and serious DIY users who need a high-pressure cordless lubrication tool.
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