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W450769A 01/14
3.7 Reeling Drum Overview
The primary operation of the Reeling Drum is to measure the extension of the telescoping sections of
the main boom. The Reeling Drum includes an angle sensor to measure the main boom angle, and an
electrical slip-ring which transfers the Anti-Two-Block signal from the reel-off cable to the system
computer.
Complete the setup and maintenance of these devices using the following procedures. Incorrect
maintenance will result in system calculation errors.
FIGURE 3.7 – REELING DRUM CUT-AWAY DRAWING
Cover
Reeling Drum Cable
Reel-to-Computer Cable
and Connector
Extension Reel
Spline
Mounting
Baseplate
Single Layer
Reeling Drum Cable
Reeling Drum Cable
Gland
Slip Ring
Assembly
Sensor Baseplate
Assembly