Electrical Swivel; Description; Theory Of Operation; Maintenance - Manitowoc Grove TMS700E Service And Maintenance Manual

SWING SYSTEM

ELECTRICAL SWIVEL

Description

The swivel assembly consists of a 49 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 harnesses which are 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 rated capacity
limiter and working area definition 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, page 6-
15, Removal in this section.
D i s c on n e c t t h e b a t te r i es b e fo r e p e r f o r m i n g a n y
maintenance on the electrical system. Serious burns may
result from accidental shorting or grounding of live
circuits.
2. Disconnect the batteries. Refer to Battery, page 3-1.
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: The large flat connector is too large to go through
the center of the hydraulic swivel. It must be
removed.
5. Disconnect the yellow ground wire from the weld stud on
the carrier frame.
6-18
CAUTION
Published 01-29-2015, Control # 512-01
TMS700E SERVICE MANUAL
6. Remove the clamp securing the wiring harness to the
retainer plate on the bottom of the hydraulic swivel
assembly.
7. Tag each wire on the large flat connector. 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. For a list of the appropriate pin
removal tools, refer to Electric System, page 3-1.
8. Secure the wires from step 7 together so the harness
can be withdrawn through the center of the hydraulic
swivel.
9. Tag and disconnect the connectors from the receptacles
on the cab bulkhead mounting plate. Disconnect the
yellow ground wire from the weld stud on the
superstructure frame.
10. Remove the nuts and washers, and remove the cover
from the electrical swivel.
11. Loosen the setscrews securing the electrical swivel
mounting tube to the center post on the water swivel.
12. Remove the bolt and nut securing the electrical swivel
case to the bracket on the case of the water swivel.
CAUTION
When withdrawing the wiring harness through the center
of the hydraulic and water swivels, ensure the wires do
not get caught and damaged.
13. 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
bracket on the water 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 6.4 mm (0.25 in) from the bracket.
Tighten the nut against the electrical swivel (see
Figure 6-6).