4.2 Upper and lower bubble level adjustment
After leveling the slewing table plane, adjust so that the bubble in each upper and lower bubble level is
center-aligned to the mark using the adjuster screw of each bubble level with the boom directed to over-front
and boom angle of 50°.
4.3 Adjustment check
Finally check if the "Inspection standard of bubble levels' bubble position" is satisfied.
Conditions: Outriggers at full extension; boom fully retracted and no load on the hook block.
• Standard for the upper bubble level: Slew the boom with the boom angle of 50°.
Check that the bubbles are within the marked range when the boom
is directed to front, rear, right and left.
• Standard for the lower bubble level: While the boom is directed to over-front and stowed, check that each
bubble is within the marked range.
4.4 Readjustment
If the standard is not satisfied, check whether the jacks are shaky and make adjustment again.
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