(1) 5-section boom
When retraction of the boom (3) becomes impossible at the position just before full retraction of the booms (4), (5)
and (6), inspect the plunger which is assembled in the telescoping cylinder (3).
When the boom (3) does not change over to the boom (2), and retraction becomes impossible at the position just
before full retraction, inspect the drilled hole at the position of the plunger of the telescoping cylinder (2).
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