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W450321A 09/12
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. Check that 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, as shown below.
Reeling Drum Viewed from Above
6.3 Checking the Reeling Drum Cable
The outer braid of the cable carries the Anti-Two-Block feed to the switches. If the cable sheath is
damaged, this may cause a short circuit to the boom/chassis. The same fault code will be indicated if
the ATB switch is closed and the inner core of the cable is shorted to the chassis at some point in the
wiring.
1. Carefully inspect the reeling drum cable for wear.
2. Check for signs of damage to the outer sheath of the cable.
3. Check for any signs of severe “kinking” or crushing of the cable.
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