Maintenance work on the superstructure
8.7 Main boom
03.11.2017
Maintenance manual 3 302 574 en 8 - 43
GMK3060
8.7.4 Checking locking units
Adapting the
interval
Each of the telescopic sections has two locking units. You have to visually
inspect the outside of all the locking units. To do so, you have to telescope
the various telescopic sections so that you can check two locking units each.
Manitowoc Crane Care recommends that you perform the external visual
inspection at the same time as lubricating the telescopic sections (M 3),
which is required every three months, as you will have established the
telescope statuses needed for inspection.
• Perform this external visual inspection at least every six months (M 6)
at every second lubrication of the telescopic sections.
Prerequisites
• Familiarise yourself with the various telescoping modes:
à Lubricating the telescopic sections, p. 8 - 38.
• Observe the prerequisites and safety instructions outlined there.
Visual inspection The truck crane is not running and is secured against unauthorised use.
• Perform the visual inspection described here in the same way on all
locking pins and all telescopic sections.
• Clean the locking pin (1).
• Check the locking pins (1) for external
damage such as breakage or deformation.
Pay particular attention to protruding
contours (6).
• Check the opening (2) in the telescopic
section (3). The opening must be flat and
without grooves, cracks or deformations.
• Check that the holes for the lubricating
nipples (5) and the emergency actuation
screw (4) are undamaged.
• Have damage on the locking units repaired by Manitowoc Crane Care or an
authorised GROVE dealer without delay.
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