LOAD KING 80-160, Operator'S Manual

Page: 145 / 369

145
NOTES:
The disassembly of boom is a recommendation for proper inspection related to wear,
corrosion, cracks or breakage of components. If crane is used in a highly corrosive environment due
to salts or chemicals, then inspection and maintenance intervals should be more frequent than
shown above.
WEEKLY:
STRUCTURAL MEMBERS AND WELDS
Visually inspect all structural members and welds including
(but not limited to) the extended boom for straightness, roller (or pad) adjustment, and cracks. Pay
special attention to the longitudinal welds joining the top, side and bottom plates. Check the welds
attaching the jib ears to the boom head and the welds attaching the boom head to the tip section. Inspect
the cylinder attaching supports and the boom pivot area.
Inspect the superstructure welds, the welds on the hoist cylinder supports and the welds between the
bottom mounting plate and the vertical plates. This is especially important if the machine is being used
extensively in clamshell, concrete pouring, headache ball, or other high duty cycle applications.
On the carrier, inspect the swing bearing weld band and supporting header welds. Check the welds
attaching the outrigger box to the frame, outrigger box ends at the collar, jack cylinder mounting tube,
and the beam welds.
Visually inspect all boom sections at least weekly or every fifty (50) hours, whichever occurs first.
Preparatory to making the inspection, set the outriggers and rotate the upper to an area where the boom
can be fully lowered and extended.
With the boom fully lowered and extended, visually inspect the sides, top and bottom of each section
for any unusual deformation, scrubbing, wear, or cracking in either the plates or welds, particularly the
fillet welds along the bottom edge of the side plates of the telescoping sections. In addition, note any
missing or illegible indicator mark decals on the telescoping sections.
If any cracks in either fillet welds or plates are noted, the particular component must
be replaced before any further crane operations are performed. This is necessary to
maintain the structural strength of the boom and prevent possible catastrophic failure
resulting in injury or property damage.
Field repair of boom sections is NOT recommended because distortion may be introduced” and original
structural strength not restored.
Boom extension indicator decals are extremely important and must be in place at all times.” Boom
section failures can occur due to overstressing within rated capacities if the sections” are not equally
extended within one indicator mark difference between the telescoping” sections.