User's Manual

40 Revision 2 GM550 v1043 FCC-IC.doc
distance from the boom base pin to the head sheave centre as measured along the
boom centreline. Depending on the exact placement of the cable reel and the cable
anchor the displayed length may differ from the actual length.
Boom Length Calibration Procedure № 1: Mechanical Set-Up
Important! Monitor length sensor cable length remaining as the boom is extended for
the first time with the installed cable reel. This generally requires a second person (in
addition to the operator.
Step 1. Fully retract the boom
Step 2. Adjust the loose wire rope at the boom tip so that the displayed boom length matches
the actual boom length.
Step 3. Fully extend the boom
Step 4. Verify the boom length indicated at full boom extension matches the actual fully
extended boom length. If not then follow Boom Length Calibration Procedure № 2.
Figure: GS550 LCD – typical operation page two with boom length indication
Cable anchor
Cable guide
Cable reel
Boom base pin
Boom length
Figure: The actual boom length