Maeda MC405C-3 - Slew Ring Mounting Bolt Inspection; Replace Air Cleaner Element

Section 5 – PERIODIC MAINTENANCE Mini-Crawler Crane M A E D A
5-50 1/2019 MC405C-3
(3) Allow all the outriggers to be extended,
referring to "OUTRIGGER SETTING" on
page 4-42. Extend and retract the
outrigger cylinder, keeping the machine
down on the ground.
Always stop the outrigger cylinder
approx. 100mm back from the stroke
end when operating the cylinder.
Repeat this task 4 to 5 times.
9. Reattach the machinery cover as described
in "Installing Machinery Cover" on page 5-
18.
Slew Ring Mounting Bolt Inspection
WARNING!
• If the slew ring mounting bolts become
loose and break, there is a risk of serious
injuries due to the upper part of the crane
becoming detached and toppling. Be sure to
inspect the slew ring mounting bolts, and
retighten them to the specified torque if
they are loose.
• Be sure to replace the slew ring mounting
bolts periodically. The bolts should be
replaced every 7 years or after 7,000 hours,
whichever comes sooner.
Slew ring mounting bolt tightening torque
No.
Mounting
position
Dimensions
Number
used
Tightening
torque
(1)
Bearing
inner ring
side
M20 25
363 to
392 Nm
(2)
Bearing
outer ring
side
M18 10
235 to
265 Nm
Fig. 5-102
Inspect the inner ring mounting bolts (2) as
follows.
1. Remove the two mounting bolts (4) and
remove the inspection cover (3) to the right
of the slew post.
Fig. 5-103
2. Rotate the post to position each bearing
inner ring side mounting bolt (2) in the
middle of the inspection opening (A), and
inspect all of the mounting bolts (2) to
confirm that none are loose, missing, or
damaged.
3. If any of the bolts are loose, retighten using
the tightening torques given in the table
above. If bolts are damaged or missing, they
should be replaced with new ones.
4. Once inspection is complete, reattach the
inspection cover (3).
Inspect the outer ring mounting bolts (1) as
follows.
1. Rotate the post to position each bearing
outer ring side mounting bolt (1) at the side
of the machine, and inspect all of the
mounting bolts (1) to confirm that none are
loose, missing, or damaged.
2. If any of the bolts are loose, retighten using
the tightening torques given in the table
above. If bolts are damaged or missing, they
should be replaced with new ones.
Replace Air Cleaner Element
CAUTION: For more information on
replacement procedure, see "Inspection,
Cleaning and Replacement of Air Cleaner" on
page 5-72.