LOAD KING 80-160, Руководство оператора

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289
Anti-Two-Block System
MAINTENANCE
This crane is equipped with an ATB system for both main boom head and jib which sounds a horn (when
in the “on” position) and lights a light when a two-blocking condition is imminent. The system will also
electrically disconnect the circuit for winching up or extending the boom in the event of an imminent
2-block condition. Verify that the two-blocking system is functioning properly by performing the following
procedure.
Check ATB switch(es) and freedom of chain-hung counterweight (item 6) as shown on main boom head
in graphic below or in similar application on jib. Check the plug and socket connection at boom head
and on jib, if erected and reeved, for connection. The jib connector must be plugged into the boom head
receptacle. Check system indication and shut-off, by manually lifting chain hung counterweight( s). A
warning light should come on, horn, if in “on” position, should sound, and shut-off system should
disconnect controls. Check entire length of cable and cable reel for evidence of damage. Check spring
loaded cable reel. Ensure it has spring tension and is free to rotate. Check cab control unit. If the crane
is equipped with control linkage disconnect, perform the following checks, also.
1
5
6
1 2 3
4
1 2-Block Wire 4 2-Block Switch
2 2-Block Reel 5 2-Block Chain
3 2-Block Wire (to collector ring) 6 2-Block Weight
1. With the engine ignition key in the “off” position, check that free action (no selfcentering) occurs on
the boom lowering pedal, the boom telescope lever- extended direction, and the winch lever (S) -
raising direction.
2. With the engine ignition key in the “on” position, check to be sure that these controls latch (remain
in the neutral position) and provide a normal centering action.
NOTE:
This may require lowering the hook block away from the trip mechanism at the boom head
to enable the “latching” of controls.