Manitowoc Grove RT770E, Service Maintenance Manual

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ELECTRICAL SYSTEM RT770E SERVICE MANUAL
3-8
Published 11/26/2014, Control # 447-05
Table 3-1
General Troubleshooting
NOTE: Make voltage checks at terminations when
components are installed and operating. Make
continuity checks (with batteries disconnected)
when components are isolated or removed.
Troubleshoot per the following guidelines:
1. First, use reported symptoms to identify a problem or a
suspect component.
2. Test the suspect component per instructions in this
section. The instructions identify the fuses and
components and guide you from the easiest and most
likely problems to the hardest and least likely problems.
3. Using a multimeter, test the 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.
4. If the component proves faulty, replace it with a known
working component. If wiring proves faulty, replace it
with wiring of equal gauge.
5. After troubleshooting, test the repaired circuit. Verify the
circuit works properly.
Tools for Troubleshooting
This machine Incorporates a CAN bus Multiplex system. In
order to effectively troubleshoot the electrical system, you
need a Windows-based PC, CAN-link service software and a
connection cable. The CAN-link service software and
connection cable are available through Crane Care to those
service technicians who have attended the Grove New
Technology training course.
Troubleshooting Swivel-Caused Electrical
Problems
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 the pin or socket connectors. 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.
Refer to the following tables listing tools necessary for
connector maintenance.
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.
Table 3-2
AMP Extraction Tool Table
Zone Classification
A Tropical Moist: All months average above 18° C. Latitude 15° - 25° North and South
B Dry or Arid: Deficient precipitation most of the year. Latitude: 20° - 35° North and South
C Moist Mid-Latitude: Temperature with mild winters. Latitude: 30° - 50° North & South
D Moist Mid-latitude: Cold winters. Latitude 50° - 70° North & South
E Polar: Extremely cold winters and summers. Latitude: 60° - 75° North & South
Description AMP Part Number Manitowoc Part Number
14 gauge wire (connectors) 305183 9999100176
12 to 8 gauge wire (connectors) 91019-3 9999100175