BA.GB.12-27409-05-07-FTA-jr
9.4.5.7 Boom
Inspection see „Complete Ruthmann-Steiger“. Further checks:
No occurrence of noise of the telescopes.
Well-running of retraction chains and extension ropes, guide roll-
ers, power track.
Contamination, damage and wear of telescope guiding devices,
gliding surfaces, retraction chains and extension ropes, guide roll-
ers, power track, etc.
Prestressing of retraction chains and extension ropes. Both chains
and/or ropes, belonging to the system (retraction „E“ and/or exten-
sion „A“) must approximately take the same load (E
1.1
= E
1.2
; E
2.1
=
E
2.2
and E
3.1
= E
3.2
/ A
1.1
= A
1.2
; A
2.1
= A
2.2
and A
3.1
= A
3.2
).
Wearing length of retraction chains. Elongation of extension
ropes. Among other things a reduction of the diameter of the ex-
tension ropes is an indication for a rope elongation. Ropes with a
reduced diameter, even with only short ropes, must be exchanged.
Check retraction chains for surface rust, joint rust, stiffness of
joints, twisted, loose or broken chain bolts, broken shackles. In
case of damaged chain the chain must be replaced immediately.
Check extension ropes for surface rust, broken wires in the rope
strands and right fit in pressed steel fitting. Ropes showing a con-
siderable external wear will relatively often have broken wires in
the rope strands. Damaged extension ropes must immediately be
exchanged.
Check the fixing points of the retraction chains and extension
ropes.
The retraction chains inside the boom system must be checked e.g. by
means of an endoscope. The inspection by means of an endoscope be-
comes possible without comprehensive demounting of parts. The extension
ropes and rope rollers can be checked through the inspection apertures
(„I
1
“ to „I
3
“) at the corresponding boom head (left and right). You can addi-
tionally also demount the scraper (brushes) at boom head for inspection of
extension ropes. In order to control the limit switches cables / chain brake,
two further inspection ports („I4“) are situated at the top on the boom’s foot
of the boom „V“. For this purpose, the booms must slightly be extended
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