There are significant differences between pneumatic grease guns and manual grease guns in terms of structure, working principle, usage efficiency and applicable occasions. Here are their main differences:

How it works:
Pneumatic grease gun: A pneumatic grease gun is driven by compressed air and uses the power of air German type grease gun pressure to push butter out of the barrel. It relies on an external air source, such as an air compressor, to provide power, so no pushing is required to operate, just pressing the trigger.
Manual grease gun: The manual grease gun is manually operated to push the piston on the gun body, compress the butter manually, and spray it out through the nozzle. The user needs to press the handle repeatedly to push the piston and rely on his own strength to pressurize and output butter.
Efficiency and work intensity:

Pneumatic grease gun: The biggest advantage of pneumatic grease gun is high efficiency and labor saving. Since the pneumatic system can provide continuous and stable pressure, it can reduce operator fatigue during long-term and high-frequency use, and is suitable for occasions that require large amounts of oil injection or long-term work.
Manual grease gun: Manual grease guns work less efficiently and require greater physical labor. Especially when lubricating larger machinery or equipment, it may be more laborious. Manual grease guns are used more intensively, especially at higher pressures.
Applicable occasions:

Pneumatic grease gun: It is suitable for large-scale industrial production, automobile maintenance, engineering machinery, agricultural equipment and other occasions that require a large amount of oil injection. Especially in high-frequency, high-pressure lubrication operations, the advantages of pneumatic grease gun are more obvious.
Manual Grease Gun: Manual grease guns are generally suitable for small to medium-sized equipment, home use, or repair work. It is more suitable for occasions where the lubrication quantity is not large and the operating environment is not complex.
Ease of operation:

Pneumatic grease gun: Since the pneumatic grease gun relies on compressed air, it not only needs to be connected to an air source, but also when operating, the pneumatic grease gun is heavy and may not be suitable for use in places with small spaces or where an air source cannot be provided.
Manual grease gun: The manual grease gun has a simple structure, compact size, and does not require an external air source. Therefore, it is more flexible to use and is suitable for highly mobile operating environments.
Maintenance and costs:

Pneumatic grease gun: The cost of pneumatic grease gun is relatively high, and it requires maintenance of the air source system (such as air compressor, etc.), which increases the maintenance cost and complexity of use.
Manual grease gun: The manual grease gun is relatively cheap, has a simple structure, does not rely on a complex air source system, and has low maintenance costs. It is suitable for users with limited budget or low equipment requirements.
To sum up, both pneumatic grease guns and manual grease guns have their own advantages and disadvantages. Pneumatic grease guns are suitable for industrial environments that require efficient and long-term operations, while manual grease guns are suitable for simpler application scenarios that require higher operational flexibility. Which type of grease gun to choose should be determined based on factors such as actual needs, operating environment, and budget.