SLEWING RINGS
SUB-SECTION 6E
SUB-SECTION 6E
SLEWING RINGS
the terminal board on the cab firewall and the fuel gauge
GENERAL
sending unit.
The slewing ring is basically a large bearing upon which the
The wiring of later machines is equipped with plugs near
upper is mounted. The outer race of the slewing ring is
the bottom of the collector assembly. Disconnect these
bolted to the upper, and the inner race is bolted to the deck
of the carrier. An internal ring gear machined into the inner
plugs.
face mates with the swing pinion which projects downward
4. Block or support the upper using a suitable lifting
from the swing reducer mounted on the revolving frame.
device. Be sure the upper is blocked or supported
This arrangement allows the upper to rotate in a full circle,
adequately, because the next step of these instructions
when the upper is driven by the swing reducer.
remove the bolts which secure the upper to the slewing
ring.
REPAIR
5. Loosen all the bolts which secure the upper to the
A slewing ring is not a repairable item. If the slewing ring is
slewing ring, and allow them to drop to the carrier deck.
no longer serviceable, it must be replaced with a new unit.
The bolts which are secured with a nut should be removed.
Any attempts to disassemble or repair the slewing ring will
6. Lift or jack the upper until the bottom of the collector
void any warranty, expressed or implied.
assembly is above the top of the slewing ring. Then place
the upper on suitable blocking away from the carrier, or
REMOVAL
drive the carrier out from below the upper. If the carrier is
driven out from below the upper, the upper should be
To remove the slewing ring, proceed as follows (see Figure
placed on suitable blocking while the slewing ring is being
6E-1):
removed from the carrier.
7. Remove all the bolts and hardened washers which are
used to secure the slewing ring to the carrier deck.
Extreme caution must be exercised when replacing the
slewing ring, as it is necessary to remove the upper
8. Install a suitable eyebolt in two holes which are 180
from the carrier to replace the slewing ring. Every
degrees apart. Attach a suitable lifting sling to these eye
precaution must be taken to prevent the upper from
bolts and lift the slewing ring from the carrier.
falling or shifting while lifting the upper and when
the upper is off the carrier.
INSTALLATION
1. Block the carrier so that it will not move while the
upper is being removed. Position the upper in the position
To install a new slewing ring, proceed as follows:
it will have to be to remove it.
1. Clean the carrier ring and the tapped holes in the ring
2. Disconnect the hydraulic hoses attached to the rotary
with a suitable cleaning solvent, and blow the surface and
joint, at the point where the hoses are connected to the
holes dry with compressed air.
hydraulic tubes on the carrier. Note the routing of each
2. Install the eyebolts in the new slewing ring in the same
hose before removing it. Cap each hose and tube as the hose
manner as they were installed in the old slewing ring for
is removed to prevent dirt from entering the system.
removal, and lift the new slewing ring onto the carrier.
Position the slewing ring so that the word FRONT stamped
3. Disconnect the electrical wires attached to the collector
on the inner race will be facing the rear of the carrier when
assembly. The wiring of earlier machines is connected
permanently to the collector and must be disconnected at
it is bolted to the carrier deck.
6E-1
