Page 204 2
nd
Edition – Rev 0
20-20
CONTROL CABLE – MAINTENANCE PRACTICES
Pulleys
Inspect pulleys for roughness, sharp edges, and presence of foreign material embedded in the
grooves. Examine pulley bearings to assure proper lubrication, smooth rotation, freedom from
flat spots, dirt, and paint spray. Periodically rotate pulleys, which turn through a small arc, to
provide a new bearing surface for the cable. Maintain pulleys alignment to prevent the cable
from riding on flanges and chafing against guards, covers, or adjacent structure. Check all
pulley brackets and guards for damage, alignment and security.
Pulley wear patterns
Various cable system malfunctions may be detected by analyzing pulley conditions. These
include such discrepancies as too much tension, misalignment, pulley bearing problems, and
size mismatches between cables and pulleys. Examples of these conditions are shown in the
figure below.
Figure 4. – Pulley wear patterns
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