Reference
Only
Manitowoc
Published 09-09-16, Control # 229-09
8-9
MLC650 SERVICE/MAINTENANCE MANUAL
UNDERCARRIAGE
8
8
TURNTABLE BEARING BOLT PERIODIC
TIGHTENING
After the first 50 hours of initial operation, tighten all bolts,
three at a time, in the numbered sequence (see
)
to 8700 Nm (6,400 ft-lb).
Annually or every 2,000 hours of operation (whichever
comes first), tighten all bolts, three at a time, in the numbered
sequence (see
) to 8700 Nm
(6,400 ft-lb).
If during annual turntable bearing bolt tightening, one or
more bolts are found to be tightened to less than 6960 Nm
(5,120 ft-lb), replace each loose bolt and washer as well as
the bolts and washers on each side of each loose bolt.
If during annual turntable bearing bolt tightening, 16 or more
bolts in either the inner or outer ring are found to be tightened
to less than 6960 Nm (5,120 ft-lb), replace all of the bolts and
washers for the corresponding ring.
Replace all bolts and washers anytime a new turntable
bearing is installed.
REPLACING TURNTABLE BOLTS
1.
Apply Never-Seez to the following:
•
Bolt threads
•
Bolt under head
•
Both sides of the washer
2.
Position the chamfers of the washers toward the bolt
head, then insert the bolts through the washers.
3.
Install and tighten the bolts, three at a time, in the
numbered sequence (see
) to an initial torque
of 2900 Nm (2,100 ft-lb).
4.
Tighten the bolts, three at a time, in the numbered
sequence (see
) to a final torque of 6960 Nm
(5,120 ft-lb).
CRAWLER PREVENTIVE MAINTENANCE
Crawler wear cannot be eliminated, but the rate of wear can
be reduced through regular preventive maintenance as
follows:
•
Lubricate the crawlers as instructed in the MLC650
Lubrication Guide.
•
Keep the crawlers clean and avoid dirt buildup when
cutting.
•
Keep all mounting bolts tight (see Parts Manual for
applicable torque values).
•
Keep the treads properly adjusted.
•
Inspect the crawler frames, rollers, and treads on a
regular basis.
•
Check for oil leaks, excessive wear, cracks, and other
damage. Broken or cracked parts can indicate that the
treads are adjusted too tightly.
•
Repair or replace damaged parts immediately to prevent
further damage.
DANGER
Crushing Injury Hazard!
Two people are required to install the turntable bearing
bolts, an operator to operate swing control and a
mechanic to tighten the bolts to the correct torque.
It is necessary for the mechanic to go inside the rotating
bed to tighten the inner turntable bearing bolts, requiring
the following to be complied with:
•
Maintain constant communication between the
operator and mechanic while the mechanic is inside
the rotating bed.
•
The operator shall not swing the upperworks until
instructed to do so by the mechanic.
•
The mechanic shall stay well clear of moving parts
while the upperworks are being swung to position the
bolts.
WARNING
Bolt Failure!
Loose or improperly tightened bolts can cause bolts or the
turntable bearing to fail, possibly allowing the upperworks
to break away from the carbody.
Содержание MLC650
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