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Part-specific Notes
7000 "A" Frame
Cooling Fans
Inspect fans used for forced air cooling. Replace any that have bent,
chipped, or missing blades, or if the shaft does not turn freely. Apply power
momentarily to check operation. If unit does not operate, check and replace
wiring, fuse, or fan motor as appropriate. Clean or change air filters as
recommended in the Users Manual.
Operating Mechanisms
Check for proper functioning and freedom from sticking or binding. Replace
any broken, deformed or badly worn parts or assemblies according to
individual product User Manuals. Check for and securely retighten any
loose fasteners. Lubricate, if specified in individual product instructions.
Many devices are factory lubricated. If lubrication during use or
maintenance of these devices is needed, it will be specified in their
individual product instructions and/or User Manual. Note: Allen-Bradley
magnetic starters, contactors and relays are designed to operate without
lubrication. Do not lubricate these devices, because oil or grease on the pole
faces (mating surfaces) of the operating magnet may cause the device to
stick in the "ON" mode.
Contacts
Check contacts for excessive wear and dirt accumulations. Vacuum or wipe
contacts with a soft cloth if necessary to remove dirt. Contacts are not
harmed by discoloration and slight pitting. Contacts should never be filed, as
dressing only shortens contact life. Contact spray cleaners should not be
used as their residues on magnet pole faces or in operating mechanisms may
cause sticking and can interfere with electrical continuity. Contacts should
only be replaced after contact face material has become badly worn. Always
replace contacts in complete sets to avoid misalignment and uneven contact
pressure.
Vacuum Contactors
Contacts of vacuum contactors are not visible, so contact wear must be
checked indirectly. Vacuum bottles should be replaced when:
1. The contactor wear indicator line shows need for replacement, or
2. The vacuum bottle integrity tests show need for replacement.
Replace all vacuum bottles in the contactor at the same time to avoid
misalignment and uneven contact wear. If the vacuum battles do not require
replacement, check and adjust overtravel to the value listed in the product
User Manual.
Preventative Maintenance Schedule
7000A-UM151E-EN-P - October 2018
E-13
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