Maintenance work on the superstructure
8.7 Main boom
8 - 52 3 302 744 en Maintenance manual
GMK5250L
09.03.2018
8.7.3 Checking locking units
Adapting the
interval
The telescopic sections I to VI have two locking units each. 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 the external visual inspection at least every six months (M6)
every other time the telescopic sections are lubricated.
Prerequisites • Consult the Chapter: à Lubricating the telescopic sections, p. 8 - 48.
• 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 pin (1) for external
damage such as fractures or deformations.
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 whether the bores for the grease
nipple (4) and the emergency activation
screw (5) are free of damage.
• Have damage on the locking units repaired by Manitowoc Crane Care or an
authorised GROVE dealer without delay.
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