4. Bubble level adjustment
The upper bubble level in the cab and the lower bubble level on the outrigger control panel must be adjusted
so that they are parallel to the slewing table plane (*1).
The following shows the general adjustment procedure for bubble levels of large cranes (AC, RC and TC
cranes). (*2)
4.1 Leveling the slewing table plane
First set the machine so that the slewing table plane is horizontal.
Prepare bubble levels other than the ones provided with the machine and set the machine in either of the
methods A and B.
Conditions
Location: On firm and level ground
Outrigger configuration: Maximum extension
Boom configuration: Fully retracted; at elevation angle of 50°; no load on the hook block
○Method A (Case where the machining surface on the slewing bearing can be used)
In case that the machining surface on the slewing bearing is exposed from the base plate of the slewing
table, place bubble levels directly on the machining surface on the slewing bearing with the boom directed
to over-front. (See Fig. 2.) Then extend the jacks to set the machine level in lateral and longitudinal
directions. (*3)
After leveling the machine, make sure that the jack floats are not shaky.
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