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W450769A 01/14
3.7.1 Checking the Reeling Drum Cable Layering
The Reeling Drum is designed to provide accurate measurement of boom extension. To provide
accurate measurement, the Reeling Drum cable must form a single flat layer across the surface of the
Reeling Drum as the boom is telescoped in and out. Any stacking of the cable will cause extension
errors as the boom retracts.
1. Telescope the boom fully out and then fully in.
2. Check that the reeling drum cable forms a flat single layer across the surface of the Reeling
Drum, with each successive turn of cable laying next to the last.
NOTE: If any stacking or build-up of the cable occurs, ensure the first cable guide at the top of the
boom root section is correctly aligned with the outside edge of the Reeling Drum. Clean the reeling
drum cable and lubricate it with a silicone spray.
FIGURE 3.7.1 - REELING DRUM VIEWED FROM ABOVE
