This is the brand name of the engine manufacturer, which is likely not an official Caterpillar (CAT) supplier. 

The term suggests an electric-start diesel engine. 

This refers to a specific model of CAT diesel engine, known for its use in heavy construction, industrial, and marine applications, including powering mud pumps. 

This is likely a specific model or configuration of the 3408 engine from MAOQUN, rather than a CAT engine designation. 

This indicates its intended application in heavy machinery, like bulldozers. 

This is a highly unusual and likely incorrect specification for a heavy-duty diesel engine like a 3408. A 3408 engine is a large displacement V8 engine (around 18 liters), not a small 250cc engine. 

These are other Caterpillar engine models, suggesting the MAOQUN engine is designed as a compatible replacement part across a range of CAT engines. 

A general category for engines used in various machines. 

This suggests the engine is often used to power pumps, such as mud pumps used in drilling operations.