SUB-SECTION 6B
SWING REDUCERS
the housing. Tap the gear housing into place with a
16. Rotate the motor assembly by hand to the position it
soft hammer. Be careful not to pinch the O-rings
was at prior to disassembly. Install brake springs (73) in the
while assembling these components.
same symmetrical pattern as they were prior to disassem-
bly. Lubricate O-ring (58) with grease and install it in the
M. Install key (6) in the motor shaft. Install gear (20)
groove in spring cover (77). Give the O-ring an additional
with the keyed bore on the motor shaft. Install the
coat of grease.
other gear (20) in the bearing in the shaft end cover.
17. Install spring cover (77) over the motor assembly so
N. Lubricate O-ring (8) and install it in the groove at the
that the vent port is located where it was prior to disassem-
end of the motor shaft. Install sleeve (5) on the
bly. Install capscrews (75) with washers (76). Tighten all
motor shaft so that it covers O-ring (8) and contacts
the capscrews finger tight, and than tighten them one-half
the shoulder at the end of the motor shaft.
turn at a time, progressively around the rim of the spring
cover. Torque the capscrews to 35 foot-pounds (4.8 m-kg).
O. Install snap ring (4) on the end of the motor shaft.
Make sure that it is seated properly in the snap ring
INSTALLATION
groove.
To install a new or overhauled swing reducer, proceed as
P. Install two capscrews (14) and torque them to 250
follows:
foot-pounds (34.5 m-kg). Install the port end cover
previously assembled, on gear housing (21) so that
1. Place the swing reducer on the revolving frame. Rotate
the unit, as required, to position the brake and motor ports
the thrust plate on the port end cover enters the gear
properly, and to align the mounting holes.
housing. Tap the port end cover with a soft hammer
until its seated against the gear housing. Be sure O-
2. Install the capscrews and washers that were originally
ring (18) does not get pinched during assembly. In-
used to secure the swing reducer to the revolving frame. Do
stall five capscrews (13) and tighten each capscrew
not use substitutes, as these are high strength capscrews and
hardened washers.
evenly in stages to a torque of 250 foot-pounds (34.5
m-kg).
3. Tighten each capscrew to 400 foot-pounds (55.3 m-kg)
(dry), using a cross bolt tightening sequence.
NOTE
4. Install the five tubes that ware removed to allow removal
of the swing reducer.
After tightening capscrews (13) to their specified
torque, be sure that the motor shaft can be rotated
5. Remove aIl the materials used to prevent the upper from
by hand.
swinging while the swing reducer was removed from the
machine.
15. Once the motor assembly is in place, install snap ring
6. Swing the upper slowly in both directions and apply the
(74) and make sure that it is seated properly in the snap
swing brake several times to purge any air from the swing
ring groove. Lubricate O-ring (78) with grease and install it
and swing brake circuits. Also, check the operation of the
in the groove on the motor assembly. Give the O-ring an
swing reducer while the upper is being swung.
additional coat of grease.
6B-10
