Excavator Operations & Safety
Swing radius hazards, swing locks, swing brakes, excavator lifting, bucket teeth rules, and safe digging practices.
- Identify swing radius hazards and the purpose of barricading
- Explain swing lock and swing brake functions on excavators
- Describe excavator lifting capacity and rated lifting eye requirements
- Explain track tension, undercarriage maintenance, and cleaning
Leçon 1
Excavator Components & Controls
Excavator Overview
Excavators are among the most versatile machines on a construction site. They consist of an upper structure (house) that rotates 360 degrees on a lower structure (undercarriage with tracks). The upper structure includes the cab, engine, hydraulic pumps, counterweight, boom, stick (dipper arm), and bucket.
Control Patterns
Excavators use two joysticks to control four functions: boom (up/down), stick (in/out), bucket (curl/dump), and swing (left/right). The two most common control patterns are ISO and SAE (sometimes called John Deere pattern). Operators must know which pattern their machine uses before operating.
Hydraulic Systems
The excavator's hydraulic system powers all working functions. It typically uses two or three main pumps plus a pilot pump. Pilot pressure from the joysticks controls the main valve, which directs high-pressure oil to the cylinders and swing motor. Understanding this hierarchy helps with troubleshooting.
Excavators rotate 360 degrees on their undercarriage. They use boom, stick, bucket, and swing controls via two joysticks. Operators must verify their machine's control pattern before operating.