Manitowoc MLC150-1, Руководство по техническому обслуживанию

Страница: 189 / 206

Manitowoc
Published 03-21-2021, Control # 264-01
8-13
MLC150-1 SERVICE/MAINTENANCE MANUAL UNDERCARRIAGE
8
SLEWING RING ALIGNMENT
See Figure 8-7 for the following.
Install the inner ring (1) so the S stamp is towards the side of
the carbody (7).
Two shear pins (5) are installed in the rotating bed (8) to
locate the outer ring (2) with the rotating bed.
Verify the S stamp in the outer ring (2) is toward the side of
the rotating bed (8).
SLEWING RING BOLT
See Figure 8-7 for the following procedures.
After First 50 Hours of Operation
Tighten all bolts (3), two at a time, in the numbered sequence
given to 2 847 Nm (2,100 ft-lb).
Annually or Every 2,000 Hours of Operation
(whichever comes first)
Tighten all bolts (3), two at a time, in the numbered sequence
given using two steps:
• First to 814 Nm (600 ft-lb)
• Final to 2 847 Nm (2,100 ft-lb)
If during the annual interval:
• One or more bolts (3) are found to be tightened to less
than 2 278 Nm (1,680 ft-lb), replace each loose bolt (3)
and washer (4) as well as one bolt (3) and washer (4) on
each side of each loose bolt.
• 10 or more bolts (3) in either ring are found to be
tightened to less than 2 278 Nm (1,680 ft-lb), replace all
of the bolts (3) and washers (4) for the corresponding
ring.
Replace all of the bolts (3) and washers (4) anytime a new
slewing ring is installed.
REPLACING SLEWING RING BOLTS
1. Apply Never-Seez or an equivalent anti-seizing lubricant
to:
• Bolt threads
• Underside of bolt heads
• Both sides of all washers
2. Install and tighten the bolts (3), two at a time, in the
numbered sequence to an initial torque of 814 Nm
(600 ft-lb).
3. Tighten the bolts (3), two at a time, in the numbered
sequence to a final torque of 2 847 Nm (2,100 ft-lb).
DANGER
Crushing Injury Hazard!
Two people are required to install the slewing ring bearing
bolts, an operator to operate the 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 slewing ring bearing bolts,
requiring the following to be complied with:
• Maintain constant communication between the
operator and the 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 is being swung to position the
bolts.
WARNING
Bolt Failure!
Loose or improperly tightened bolts can cause the bolts or
the slewing ring bearing to fail, possibly allowing the
upperworks to break away from the carbody.
REFERENCE
ONLY