What Is a 2-Speed Grease Gun?

A grease gun is a tool designed to apply lubricating grease under pressure to mechanical parts via grease fittings (zerk fittings).

A 2-speed grease gun offers two operating modes:

• High-flow / low pressure mode — pushes grease quickly when resistance is low (e.g. filling lines, free fittings)
• High pressure / low flow mode — delivers grease under much higher pressure to force through tight or blocked fittings

The ability to switch between modes gives you more control, efficiency, and the capacity to handle both routine greasing and tougher, clogged fittings.

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Why Use a 2-Speed Model?

Here are the key advantages:

• Versatility — You don’t need separate tools for light and heavy lubrication tasks.
• Efficiency — Use high flow when possible, then switch to high pressure for stubborn spots.
• Less fatigue & mess — You can deliver grease more cleanly and with better control.
• Better for equipment maintenance — Many industrial machines or agricultural gear have hard-to-reach or clogged fittings.

For instance, Milwaukee’s 2-speed model offers up to 10,000 PSI of max operating pressure.

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Key Features & Specs to Compare

When selecting a 2-speed grease gun, watch for:

Feature	Why It Matters
Max pressure (PSI)	Determines how tough a fitting you can grease.
Flow rate	How much grease per minute—useful in high-flow mode.
Barrel / Cartridge Capacity	How much grease you can hold (e.g. 400 g or 450 g)
Hose / Delivery Line Length & Flexibility	Helps reach difficult areas
Mode switching mechanism	How easy it is to switch between 2 speeds
Bleeder / priming valve	To release trapped air and ensure smooth flow
Grease counter / dosage control	Lets you preset or monitor how much grease you dispense
LED light / visibility aids	Useful in dark or tight spaces
Weight & ergonomics	Heavier tools fatigue you; balance is important
Battery / power system (for cordless models)	Voltage, battery life, compatibility with your existing tools

For example, Milwaukee’s 18V 2-speed grease gun offers a flow rate of about 103.5 ml/min in speed 1 and ~295.7 ml/min in speed 2, with a 1.2 m flexible hose.

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Tips & Best Practices for Use

• Start in the lower pressure / high flow mode for general greasing. Only switch to high pressure when the flow slows or fittings resist.
• Prime & bleed air before use — air in the lines will reduce effectiveness and cause erratic delivery.
• Use proper fittings & sockets — damaged or partial fittings reduce performance or cause leaks.
• Don’t overfill — excess grease can cause seals to blow or blowback.
• Clean the coupling after each use to avoid contamination.
• Switch mode back after tough spots — so you don’t damage delicate bearings with excessive pressure.
• Maintain your tool — check hoses, seals, and the pressure switch periodically.
• Use the grease counter / dosage dial (if available) to avoid over-lubrication or waste.

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Top Product Recommendations

Here are several 2-speed grease guns currently on the market.