SWING SYSTEM RT540E SERVICE MANUAL
6-18 Published 4-20-2015, Control # 502-01
Electrical Swivel
Description
The swivel assembly consists of a 20 conductor slip ring and
cover assembly.
Each brush set incorporates two brushes, leads, and clips
which are attached to a brush holder assembly. The brush
set leads are formed into harnesses which are routed
through the mounting plate on the swivel. The collector ring
leads are formed into one harness which is routed downward
through the center of the hydraulic swivel. Extending from
the base of the hydraulic swivel, the collector ring leads are
also formed into connectors which plug into receptacles from
the chassis power supply.
The swivel cover is secured with a seal and bolts
The electrical swivel also incorporates a slew potentiometer.
The potentiometer controls functions in the load moment
indicating, working area definition, and rear axle oscillation
lockout systems.
Theory of Operation
The electrical swivel is located on top of the water swivel and
transfers electricity between the carrier and superstructure.
Wiring harnesses transmit the electricity between the carrier
and superstructure.
Maintenance
Removal
1. Perform steps 1 through 4 of HYDRAULIC SWIVEL -
REMOVAL in this section.
2. Disconnect the batteries. Refer to Section 3 -
ELECTRIC SYSTEM.
3. Locate the connectors which join the collector ring
harness to the receptacles for the carrier.
4. Tag the connectors and their receptacles with numbers.
Disconnect the connectors from the chassis wiring
receptacles.
5. Remove the clamp securing the wiring harness to the
retainer plate on the bottom of the hydraulic swivel
assembly.
6. Secure the connectors and wires from each of the
numbered connectors so the harness can be withdrawn
through the center of the hydraulic swivel.
7. Tag and disconnect the connectors from the receptacles
on the cab bulkhead mounting plate.
8. Remove the setscrews and remove the cover from the
electrical swivel.
9. Loosen the capscrews securing the electrical swivel
mounting tube to the center post on the water swivel.
10. Remove the capscrew and jam nut securing the
electrical swivel case to the plate on the case of the
water swivel.
11. Remove the swivel and wiring harness from the crane. If
necessary, remove the spacer bushing from the center
post.
Installation
1. If removed, install the spacer bushing on the center post.
Route the collector core wiring harness through the
center of the hydraulic and water swivels.
NOTE: The boom should be centered directly over the
front of the crane before adjustment is made to the
slew potentiometer.
2. Slide the electrical swivel mounting shaft onto the center
post.
3. Ensure the threaded hole on the bottom of the electrical
swivel base is aligned with the mounting hole in the plate
on the water swivel case. Install the capscrew through
the hole in the plate and install the jam nut. Screw the
capscrew into the hole in the electrical swivel base until
the capscrew head is approximately 6.0 mm (0.23 in)
from the bracket. Tighten the nut against the electrical
swivel (Figure 6-6).
4. Apply medium strength Loctite to the setscrews securing
the electrical swivel to the center post and tighten them 5
to 6 Nm (44 to 53 lb-in)
5. Install the swivel cover and secure with capscrews and
washers.
6. Connect the wiring harness connectors to the
receptacles on the cab bulkhead mounting plate as
tagged during removal.
CAUTION
Disconnect the batteries before performing any
maintenance on the electrical system. Serious burns may
result from accidental shorting or grounding of live
circuits.
CAUTION
When withdrawing the wiring harness through the center
of the hydraulic and water swivels, ensure the wires do
not get caught and damaged.
Reference Only
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