Excavator FAQs
Common Questions Answered
Why Isn't an Excavator Called a "Soil Digger"?
The excavators we see daily are primarily used to dig soil, sand, and gravel. But excavators can do far more — by swapping the working attachment, they transform into completely different machines. That's why calling them simply "diggers" doesn't do them justice.
Here are the most common attachments and what they do:
Grab bucket: For picking up and transporting loose materials such as rubble, scrap metal, and debris.
Hydraulic breaker (impact hammer): For rock breaking, stone crushing, and building demolition.
Ripper / soil loosener: For fracturing hard rock, breaking frozen ground, and cutting through asphalt pavements.
Hydraulic shears: For demolition work and rescue operations — cutting through steel rebar and concrete structures.
Will the Operator Get Electrocuted If the Bucket Touches a Cable?
It's not uncommon for excavators to accidentally strike underground or overhead cables during construction. But surprisingly, the operator inside the cab is usually safe. Here's why:
An excavator is an equipotential body. When the boom contacts a high-voltage line, the entire machine — including the cab — becomes energized at the same voltage. Since there's no potential difference between the operator and the cab interior, no current flows through the operator's body. It's the same principle that allows birds to perch safely on power lines.
However, anyone standing outside the machine near the excavator is at serious risk of electrocution. And if the operator opens the door and steps onto the ground while the machine is still energized, a lethal current path is created through their body.
Correct response: If you strike a cable, immediately shut off the engine, stay in the cab, and signal nearby people to keep their distance. Wait for the utility company or rescue team to de-energize the line before exiting the machine.
Why Do Excavators Only Have One Arm?
Excavators have a complex structure and require significant skill to operate. From the beginning, a single boom was deemed sufficient for the vast majority of construction tasks. Mastering a single-arm excavator already demands dedicated training.
Double-arm excavators do exist — they are specialized machines used mainly in disaster zones for sorting and processing industrial waste and debris. However, they require an exceptionally high level of operational skill and are typically operated by specially trained personnel only.
Why Do Excavators Still Use Control Levers (Joysticks)?
Most excavators still rely on manual joysticks because operating an excavator is a skill deeply rooted in experience. Many construction sites have complex conditions and strict precision requirements — for example, a leveling tolerance of just a few centimeters. Current automated preset programs cannot yet adapt to or achieve that level of precision in real-world conditions.
Manual joystick control allows the operator to respond instantly to changing site conditions and execute fine, nuanced movements that presets simply cannot replicate.