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W450311 Rev C 2/13
6.2 Checking the Reeling Drum Cable Layering
The extension reel 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
extension reel 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. Ensure the reeling drum cable forms a flat single layer across the surface of the extension reel,
with each successive turn of cable lying 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 extension reel. Clean the reeling
drum cable and lubricate it with a silicone spray.
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