Maeda CC1908S-1 - Inspection

6.18 IRREGULAR MAINTENANCE M A E D A Crawler Crane
6-86 5/2020 CC1908S-1
3. Loosen the lock nut (52), adjust the wire rope
using the adjustment nut (53), and set the
No.1 fly jib to the horizontal.
• If the No. 1 fly jib is below the horizontal:
Tighten (clockwise) the adjustment nut
(53).
• If the No. 1 fly jib is above the horizontal:
Loosen (counterclockwise) the
adjustment nut (53).
There are adjustment nuts (53) on both
the left and right sides, but the derrick
wire rope is connected to just one, so
you can adjust to horizontal using either
one.
4. Tighten the lock nut (52).
5. Align the machine bolt (51) so that it lightly
makes contact with the upper surface of the
No. 1 fly jib, then tighten the nut (50).
CRAWLER TRACK SHOE
BOLT LOOSENESS
INSPECTION/
RETIGHTENING
Using the machine with loose crawler track shoe
bolts (1) will cause the bolts to break. Retighten
the bolts if found to be loose.
[1] Retightening
1. Remove the rubber pad.
2. After tightening the bolts to a tightening
torque of 765 Nꞏm +/-78 Nꞏm [78 kgfꞏm +/-8
kgfꞏm], ensure that the nuts and shoes make
tight contact with the link mating surfaces.
3. After checking, retighten them at a tightening
angle of 90 +/-10 degrees.
[2] Tightening sequence
Tighten the bolts in the order indicated in the
diagram.
After tightening, check that the nuts and shoes are
a tight fit with the link mating surfaces.