TP-6745 7/1012 Section 1 Scheduled Maintenance
1.3.2 Mechanical Interlocks and
Linkages
D Verify that mechanical interlocking is correct (i.e. one
power switching device must be well open before the
other closes).
D Check that the operating linkages are not damaged or
bent, and that all bearing points operate freely.
D 1000--1200 Amp Molded-Case Switching
Devices: Verify that all limit switch linkages are
correctly adjusted to provide full travel of the power
switching device toggles without exerting
unnecessary forces associated with excessive travel.
Check that power switching devices travel far enough
to reset any internal trip unit.
Note: It is more important for the toggle to go fully in
the off direction than in the on direction.
1.3.3 Lubrication
Maintain the transfer switch lubrication. If the transfer
switch is subject to extremely dusty or abnormal
operating conditions, relubricate movements and
linkages yearly as described below.
Disconnect power and manually operate the transfer
switch mechanism to verify that it operates smoothly
without binding. If lubricating the outer mechanism of
the transfer s witch does not eliminate binding, replace
the transfer switch assembly.
Periodically oil the enclosure door locks and screws.
100--800 Amp Molded Case Switching Devices
D Confirm that the yoke operates freely on the yoke
pivot bushings. Should lubrication be required, apply
medium weight (SAE 20) oil sparingly at these points.
D The motor and gearbox are permanently lubricated
and should not require attention under normal
operating circumstances.
1000--1200 Amp Molded-Case Switching Devices
D Ensure that the manual handle moves freely on the
hub when the lock pin is disengaged. If lubrication is
necessary, apply medium weight (SAE 20) oil
sparingly.
D Yoke pivot bearings and rod ends are permanently
lubricated and do not require maintenance.
D The motor and gearbox are permanently lubricated
and should not require attention under normal
operating circumstances.
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