Chapter 29 Preventive Maintenance Systems

Breakdown

___________ maintenance is the least sophisticated maintenance work and normally is used only on equipment that is inexpensive and noncritical to plant operations.

Corrective

_________ Work is requested, discovered during periodic inspections, or discovered while performing other maintenance tasks.

Logbook

A(n) _________ is a book or electronic file that documents all work performed during a shift and lists information needed to complete work by maintenance technicians on other shifts.

Offset

Misalignment is a condition where two shafts are parallel but are not on the same axis.

Soft foot

_________ is a condition that occurs when one or more machine feet do not make complete contact with a base plate.

Motor

The _________ is normally the machine to be shimmed (MTBS).

Plain

_________ bearings are quieter, less costly, and if kept lubricated, have little metal fatigue compared to other bearings.

Replaced

Any worn spacers, shafts, bearings, or housings must be ________.

Glazed

A ___________ belt has reduced friction with the pulleys, resulting in belt slippage and a loss of power transmission.

Angular

__________ misalignment is corrected using a level placed on top of the pulley, parallel with the pulley shaft.

Deflection

During retensioning, the __________ height from the normal position is determined by the use of a straightedge or string stretched across the pulley tops.

Hipot testers

Tests using ____________ normally involve applying a test voltage that is several times higher than the specified operating voltage of the cable or device being tested.

Insulation spot

A(n) __________ test is a test that checks motor insulation over the life of the motor.

Run-in

A machine __________ check should be made after bearing assembly is complete.

Polarization

A low ___________ index indicates excessive moisture or contamination.