6-18
Published 01-14-2021 Control # 707-01
SWING SYSTEM
TMS9000-2 SERVICE MANUAL
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.
Theory of Operation
The electrical swivel is located on top of the hydraulic swivel
a n d t r a n s f e r s e l e c t r i c i t y b e t w e e n t h e c a r r i e r a n d
superstructure. Wiring harnesses transmit the electricity
between the carrier and superstructure.
Maintenance
Removal
1.
Perform Steps 1 through 4 of
17, Removal, this Section).
2.
Disconnect the batteries. Refer to
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.
NOTE:
If the connectors are too large to go through the
center of the hydraulic swivel, they must be
removed. Conditional instructions will follow.
5.
Remove the clamp securing the wiring harness to the
retainer plate on the bottom of the hydraulic swivel
assembly.
NOTE:
If connectors are too large to go through the center
of the hydraulic swivel, tag each wire on each of the
connectors. Using the appropriate pin removal
tools, remove the pins, with wires still attached, and
mark each wire with the pin socket number in the
connector. Collect the wires and secure into one
bundle. Mark the bundle with the connector
number. For a list of the appropriate pin removal
tools, refer to
Connector Troubleshooting, page 3-
.
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numbered connectors so the harness can be withdrawn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 junction box
on the turntable.
8.
Remove the nuts and washers, and remove the cover
from the electrical swivel.
9.
Loosen the setscrews securing the electrical swivel
mounting tube to the center post on the hydraulic swivel.
10.
Remove the bolt and nut securing the electrical swivel
case to the bracket on the case of the hydraulic 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 swivel.
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
bracket on the hydraulic swivel case. Install the bolt
through the hole in the bracket and install the nut. Screw
the bolt into the hole in the electrical swivel base until the
bolt head is approximately 0.25 in (6.4 mm) from the
bracket. Tighten the nut against the electrical swivel
(Figure 6-6).
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 swivel, ensure the wires do not get caught
and damaged.
Fo
r
Reference
Only
