Condition of the visible hydraulic cylinders of the crane
Cylinders are oil-dry
Inspect the crane for cracks
One / several cracks or damages visible (cracks, dents, bruises)
Condition of the frame-suspension of the crane
Frame suspension is stable and does not move when crane in heavy use
Condition of hydraulic hose of crane
Sealed and functional - but initially porous
Condition of slewing system
Some degree of backlash visible
Are the operating hours of the crane readable
No
How many hydraulic extensions are available
Two boom extensions