Outrigger
Extendable beams with pads that stabilize mobile cranes by increasing the base of support during lifting operations.
In Detail
Outriggers are hydraulic or mechanical beams that extend from the crane's chassis and press pads against the ground to provide stability during lifting. Proper outrigger deployment is critical — the crane's load chart capacity is based on fully extended outriggers on firm, level ground. Common outrigger-related failures include insufficient ground bearing capacity (leading to sinking), uneven extension, damaged cylinders or locking mechanisms, and inadequate pad size for soil conditions. Outrigger inspection includes checking cylinders, locking pins, pads, and structural members for damage, leaks, and proper function.
Related Terms
Ground Conditions Assessment
Evaluation of the ground surface to ensure it can support the crane's weight and outrigger/crawler loads during operation.
Load Chart
A manufacturer-provided chart showing the maximum safe lifting capacities at various boom lengths and radii.
Shift Inspection
A visual inspection performed before each work shift to identify obvious deficiencies or damage.
Tip-Over
A catastrophic event where a crane loses stability and overturns, often caused by overloading, ground failure, or improper setup.