5-58 Published 3-22-2021, Control # 702-02
SET-UP AND INSTALLATION GRT8120 OPERATOR MANUAL
Anti-Two Block Switch on the Boom
Extension
Use the following procedures to install and remove the
anti-two block (A2B) switch from the boom extension base
and fly sections.
10.5 m (34.5 ft) Extension Anti-Two Block Installation
To electrically connect the anti-two block switch the electrical
connections to this extension must be completed, refer to
Boom Extension Electrical Connections, page 5-51.
1. Install the anti-two block switch assembly on to the pin
(1, Figure 5-80) and secure it with a retaining clip.
2. Route the cable so that it will not be damaged during
crane operation, and connect the anti-two block
connector to the socket, with the same number.
10.5 m (35 ft) Extension Anti-Two Block Removal
When the extension is no longer needed or if installing the
boom extension fly section for 17.6 m (57.6 ft) extension
operation, the anti-two block switch must be removed.
1. Remove the anti-two block connector from the socket.
2. Install the cap on the storage socket.
3. Remove the retaining clip from the mounting pin and
remove the anti-two block switch assembly.
The anti-two block switch can now be moved to another
location and connected.
17.6 m (57.6 ft) Extension Anti-Two Block Installation
To electrically connect the anti-two block switch the electrical
connections to this extension must be completed, refer to
Boom Extension Electrical Connections, page 5-51.
1. Install the anti-two block switch (1, Figure 5-81) on to the
pin (2) and secure it with a retaining clip.
2. Route the anti-two block cable (3) such that it will not be
damaged during crane operation, and connect the
anti-two block switch to socket (4).
17.6 m (57.6 ft) Extension Anti-Two Block Removal
1. Remove the plug from the socket (4, Figure 5-81).
2. Remove the anti-two block switch assembly (1) from the
pin (2).
3. Fasten the retaining clip to the anti-two block switch.
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