ELECTRIC SYSTEM SERVICE MANUAL 1400A
3-2 1-21-2019 Control # 104-07
General Troubleshooting
Make voltage checks at terminations when components are
installed and operating. Make continuity checks when
components are isolated or removed. Trouble shoot per the
following guidelines:
1. Use reported symptoms to identify a problem or a
suspect component.
2. Using a multimeter, test a circuit for continuity if you
suspect a broken circuit or for voltage if you suspect a
power problem. Check the electrical schematic and
wiring diagram for most accurate wiring information.
3. If the component proves faulty, replace it with a known
working component. If wiring proves faulty, replace it
with wiring of equal gauge.
4. Test the repaired circuit and verify that the circuit works
properly.
Troubleshooting the Electrical Swivel
Many crane component electrical troubles can be traced to
the electrical swivel. Troubles common to the swivel are
improper mounting, foreign material between the brushes
and slip rings, worn brushes, improper spring tension on the
brush assembly, and loose setscrews on the slip ring
assembly. Refer to the electrical schematic and wiring
diagram for slip ring connections and amperages.
Connector Troubleshooting
The cause of an electrical problem may be a loose or
corroded connection in a connector. Check the connectors to
ensure that the pins and sockets are properly seated and
engaged. If the pins and sockets show any signs of
corrosion, use a good quality electrical contact cleaner or
fine sandpaper to clean them. When the pins or sockets
show signs of arcing or burning, it will probably be necessary
to replace them.
Because the pins and sockets are crimped to the wires, it is
not possible to remove them. Using the proper extraction
tool, remove the pin(s) or socket(s) from the plug or
receptacle. Cut the wire as close to the pin or socket as
possible. After cutting the pin or socket off, the wire will most
likely be too short. Using a wire that is too short will allow
pressure to be applied to the pin or socket and wire where
they are crimped when the pin or socket is inserted in the
plug or receptacle. Add a short length of the same size wire
to the short wire by crimp, splice or solder. Use heat
shrinkable tubing or other suitable material to insulate the
splice.
DANGER
Remove all rings, watches, and other jewelry before
performing maintenance on live circuits as serious burns
can result from accidental grounding or shorting circuits.
Fo
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