Manitowoc Published 10-01-2012, Control # 045-08 3-1
777 SERVICE MANUAL ELECTRIC SYSTEM
3
SECTION 3
ELECTRIC SYSTEM
ELECTRICAL DRAWINGS AND
SCHEMATICS
Applicable electrical system drawings and schematics are
attached at the end of this Section.
CHECKING AND REPLACING ELECTRICAL
COMPONENTS
1. Visually inspect all electrical harnesses and cables
every month or at 200 hours of service life for the
following:
a. Damaged, cut or deteriorated harness loom
covering.
b. Damaged, cut or abraded individual wires or cable
insulation.
c. Exposed bare copper conductors.
d. Kinked, crushed, flattened harnesses or cables.
e. Blistered, soft, degraded wires and cables.
f. Cracked, damaged, or badly corroded battery
terminal connections.
g. Inspect all machine ground connections for
damaged terminals or excessive corrosion.
h. Other signs of significant deterioration.
If any of these conditions exist, evaluate the harness for
repair or replacement.
2. At the same service interval, visually inspect all
Controller Area Network (CAN) nodes and electrical
junction boxes for the following:
a. Damaged or loose connectors.
b. Damaged or missing electrical clamps or tie straps.
c. Excessive corrosion or dirt on the junction boxes.
d. Loose junction box mounting hardware.
If any of these conditions exist, address them
appropriately.
See Table 3-1 below for following items.
3. Harness and battery cables operating in a temperate
climate zone C are recommended to be replaced after
10,000 hours of service life.
4. Harness and cables operating in climate zone A and
zone B with high ambient temperatures and high duty
circuits could see electrical service life reduced by 25%
to 40%. It is recommended to replace these assemblies
after 8,000 hours of service life.
5. Harness and cable assemblies operating in climate
zone D and zone E, cold climates, should expect a
degrade of mechanical properties and long term
exposure to these cold temperatures will negatively
impact service life. It is recommended for these
electrical harnesses and cable assemblies to be
inspected to step 1 above as service life may be more
than 10,000 hours.
6. Harness and cable assemblies operating in salt water
climates could see a significant reduction in service life.
Therefore it is recommended for these electrical
harnesses and cable assemblies to be inspected to
step 1 above as service life may be more than 8,000
hours.
Table 3-1 Climate Zone Classification:
DANGER
Electrical Shock Hazard!
Ensure that the battery cables are disconnected from the
batteries before loosing any electrical connections.
Item Description
A Tropical Moist: All months average above 64°F (18° C)
Latitude: 15° - 25° N & S
B Dry or Arid: Deficient precipitation most of the year.
Latitude: 20° - 35° N & S
C Moist Mid-Latitude: Temperate with mild winters.
Latitude: 30° - 50° N & S
D Moist Mid-Latitude: Cold winters.
Latitude 50° - 70° N & S
E Polar: Extremely cold winters and summers.
Latitude: 60° - 75° N & S
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