SWING SYSTEM RT880E SERVICE MANUAL
6-12 Published 11-10-2014, Control # 524-00
5. Orient ring gear such that its point of max eccentricity
(“high point”) is located between the swing drives. Posi-
tion swing drives so that pinion is centered within cutout
in base plate and motor ports face towards the outboard
side as shown.
6. Position the two retainer plates on the bottom of hydrau-
lic swivel spool, engaging the lugs on the carrier frame,
and secure them to the spool with four bolt retainers and
eight bolts. Torque the bolts to 199 ft-lb (270 Nm). Bend
all the retainer tabs to make contact with the bolt heads.
7. Plug the swivel wiring harness connectors into the car-
rier receptacles. Secure the ground wire to the ground
stud using a washer, lockwasher, and nut.
8. Install the clamp securing the swivel wiring harness to
the retainer plate on the bottom of the hydraulic swivel.
9. Connect all water and hydraulic lines to the ports on the
bottom of the swivel as tagged during removal.
10. Install the boom and lift cylinder following the procedures
outlined in the section titled Boom, page 4-1.
NOTE: The counterweight/auxiliary hoist and structure
weighs approximately 24,398 lb (11067 kg).
11. Install the counterweight and auxiliary hoist following
procedures outlined in Installation of Standard Counter-
weight and Auxiliary Hoist Mounting Structure, page 5-
11.
12. Reconnect the batteries.
13. Check the slew potentiometer in the electrical swivel for
proper orientation. Refer to Swivels, page 6-12.
Testing
Activate the crane and check for proper function.
NOTE: If the superstructure does not turn freely after bear-
ing and pinion replacement, contact your local dis-
tributor.
SWIVELS
Description
The swivel assembly (Figure 6-6) consists of a 12 port
hydraulic swivel, a 2 port water swivel, and a 20 conductor
slip ring electrical swivel. Solid connections cannot be used
to transfer oil, heater hot water and electricity between the
carrier and superstructure due to the continuous 360 degree
swing. The use of swivels efficiently accomplishes this
function.
The barrel portion of the hydraulic swivel is attached to the
turntable base plate by four bolts, washers and bushings.
The spool portion of the swivel rides upon a thrust ring at the
top of the swivel case. The spool portion is held stationary
with the carrier by bolts, and bolt retainer plates attached to
the swivel retainer plate which engages the carrier frame
lugs with bolts and jam nuts. This allows the spool to remain
stationary with the carrier as the case rotates with the
superstructure.
The spool portion of the water swivel is integral with the
hydraulic swivel. The hydraulic and water swivel spools
remain stationary with the carrier as the superstructure
rotates. The water swivel case engages to hydraulic case by
four dowel pins.
The electrical swivel center or collector ring assembly is
secured by setscrews to a center post which is bolted to the
spool of the hydraulic swivel. This allows the collector ring
assembly to remain stationary with the carrier. The outer
portion or brush assembly is mounted on two studs which
are located on the mounting plate assembly which is
retained to the water swivel barrel by a bolt. This allows the
brush assembly to rotate with the superstructure around the
stationary collector core.
CAUTION
Do Not Clamp Over Pinion.
• Using shims, set backlash by moving the swing drive
assemblies toward the bearing in order to mesh the
pinion with the ring gear teeth (see Figure 6-5).
• Check tooth engagement squareness and vertical
tooth engagement.
• Remove backlash shims and recheck backlash.
FIGURE 6-5
Maximum Eccentricity Point
.008 Thick Shim By Full Width to
Tooth Engagement (.016)
Backlash)
Pinion
6492
Bearing
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