6-20
Published 10/19/2017, Control # 618-00
SWING SYSTEM GRT880 SERVICE MANUAL
ELECTRICAL SWIVEL
Description
The swivel assembly consists of a 20 conductor slip ring and
cover assembly.
Each brush set incorporates two brushes and leads 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 slip ring assembly contains an angle encoder. The
encoder sends data via CAN bus to the RCL. The RCL
converts this data into a slew angle which is used to
determine the working area definition and also for controlling
the rear axle oscillation.
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 batteries. Refer to Electrical System, page
3-1.
3. Locate connectors which join the collector ring harness
to carrier receptacles.
4. Tag connectors and their receptacles with numbers.
Disconnect connectors from chassis wiring receptacles.
NOTE: Connectors are too large pass through center of
hydraulic swivel. They must be removed.
5. Remove clamp securing wiring harness to retainer plate
on bottom of hydraulic swivel assembly.
6. Tag each wire on each connector. Using the appropriate
pin removal tools, remove pins with wires still attached.
Mark each wire with the connector pin socket number.
Secure wires into one bundle. Mark bundle with
connector number. For a list of pin removal tools, refer to
Connector Troubleshooting, page 3-12.
7. Secure connectors and wires from each of the
numbered connectors so harness can be pulled through
center of hydraulic swivel.
8. Tag and disconnect connectors from receptacles on the
cab bulkhead mounting plate.
9. Loosen jam nuts and setscrews securing electrical
swivel mounting tube to water swivel center post.
10. Remove bolt and nut securing electrical swivel anti-
rotation pin to bracket on case of the water swivel.
11. Remove swivel and wiring harness from crane. If
necessary, remove spacer bushing from 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 encoder.
2. Slide electrical swivel mounting shaft on center post.
CAUTION
Disconnect batteries before performing any maintenance
on the electrical system. Serious burns may result from
accidental shorting or grounding of live circuits.
CAUTION
When pulling wiring harness through center of hydraulic
and water swivels, ensure wires are not damaged.
Reference Only
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