TP-6745 7/10 11Section 1 Scheduled Maintenance
D Other evidence of wear, damage, deterioration, or
malfunction of the transfer switch or its components
Cleaning. Use a vacuum cleaner or a dry cloth or brush
to remove contaminants from internal components. Do
not use compressed air to clean the switch because it
can cause debris to lodge in the components and
damage the switch.
Checking and Tightening Connections. Loose
connections on the power circuits can lead to
overheating or explosion. Tighten all lugs to the torque
values on the label on the switch. See Figure 1-1 for a
typical label.
Tighten engine start, input/output, and auxiliary
connections to the torque indicated on the decals affixed
to the unit.
Part Replacement and Tightening. Replace worn,
missing, broken, deteriorated, or corroded internal
components with manufacturer-recommended
replacement parts. Contact a local authorized
distributor/dealer for part information and part ordering.
Tighten loose internal hardware.
297556
Figure 1-1 Typical Torque Label
Signs of Overheating. Replace components damaged
by overheating and locate the cause of the overheating.
Overheating could be caused by loose power
connections, overloading, or a short circuit in the
system. After tightening the power terminals, perform a
millivolt drop test to locate areas with high contact
resistance. See Section 1.4.3. Check the line circuit
breakers in the system to be sure that they do not allow
the load to exceed the switch rating. Use the controller
troubleshooting and schematics to locate a control
circuit short.
Wire Repair or Replacement. Replace wiring when
there is any doubt about its condition, or when there is
extensive damage or deterioration. If the damaged or
deteriorated wires are part of a wiring harness, replace
the entire wiring harness.
Power Circuit Wiring. Have damage to line voltage
and power circuit wiring evaluated and repaired or
replaced by a qualified electrician.
Control Circuit Leads. Repair minor damage to leads
in low power and control circuits operating up to
250 volts. Carefully splice and insulate the connections.
Tape minor control circuit wire insulation cuts or
abrasions. Repair moderately damaged leads, where
conductors are cut or insulation is damaged over
sections shorter than about 100 mm (4 in.) or less than
about 25% of the length of the wire, by cutting out the
damaged section and splicing in wire of the same type.
Use UL-listed insulated (250-volt minimum) connectors
and follow the connector manufacturer’s instructions.
Fabricate new leads using the same type of wire and
UL-listed insulated (250-volt minimum) connectors and
follow the connector manufacturer’s instructions.
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