6-13
Published 3/26/2018, Control # 596-05
GRT8100 SERVICE MANUAL SWING SYSTEM
13. Attach a suitable lifting device to four superstructure
lifting lugs (two at boom pivot shaft bushings and two at
lower lift cylinder pivot shaft bushings). Take in cable or
chain to remove slack. Do not pull up on superstructure.
NOTE: It is necessary to rotate the superstructure while
attached to the lifting device. Outer race bolts can
only be removed from the front or from under cab.
14. Remove 72 bolts and washers securing turntable
bearing outer race to carrier.
15. Carefully lift superstructure, using care not to damage
swivel assembly, and set it on blocking that will not allow
superstructure to tilt or shift, or rest on the swivel. Leave
lifting device attached.
NOTE: If same bearing is to be used again, mark position
of bearing on superstructure so it can be installed
in the exact position before removal.
NOTE: Bearing weighs between 704 kg (1552 lb). Ensure
bearing lifting device is capable of supporting the
weight.
16. Place an adequate lifting device under bearing and
remove 71 bolts and washers securing turntable bearing
to superstructure.
17. Using lifting device, remove turntable bearing from
under superstructure.
Inspection
Check bearing teeth for chipping or cracking. If any evidence
of these is found, replace bearing. Ensure bolt holes are free
of dirt, oil, or foreign material.
Installation
NOTE: If the same bearing is to be used again, align the
marked teeth on the pinion shaft and the marked
teeth on the bearing.
Installation is in the travel position. Ensure the
swing lock is disengaged before attempting to mate
the bearing to the superstructure.
1. Using an appropriate lifting device, position the turntable
bearing under the superstructure. If the same bearing is
being used, position it as marked prior to removal.
2. Install 71 new bolts and washers securing the bearing to
the superstructure. Refer to Inner Race Torquing in this
Sub-Section.
3. Using an appropriate lifting device, align the
superstructure over the carrier in the travel position and
carefully lower the superstructure, being careful not to
damage the swivel assembly, into position on the carrier
bearing plate.
NOTE: It will be necessary to rotate the superstructure
while attached to the lifting device. Outer race bolts
can only be installed from the front or from under
the cab.
4. Install 72 new bolts and washers. Refer to Outer Race
Torquing, page 6-11.
NOTE: If a new bearing is being installed, a new pinion
gear must also be used. Align the high point
(maximum eccentricity) on the bearing with the
new pinion gear high point.
DANGER
Ensure superstructure is fully supported before
proceeding. Death or serious injury may result.
DANGER
Ensure any blocking material used is capable of fully
supporting weight of superstructure and will not allow it to
tilt or shift. Failure to do so may result in death or serious
injury.
DANGER
Anytime a turntable bolt has been removed, it must be
replaced with a new grade 8 bolt. Death or serious injury
may result.
FIGURE 6-4
.008 Thick
Shim By Full
Width To
Tooth
Engagement
(.016
Backlash)
Pinion
Max
Eccen-
tricity
Point
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