Service and Maintenance
17
Removal and Storage of the Anti Two-Block Retainer Procedure (see Fig. 3 and 4):
1. Pull the cable out of the switch (1) and bend back parallel to the boom and hold (2).
2. Move the retainer down (3) and then left (4) to remove it from the Anti Two-Block switch. Release
the cable. A lanyard is supplied to connect flag to A2B mounting plate.
Fig. 3:
Removal of the Anti Two-Block Retainer
After the electrical connections have been checked to insure that the system is properly connected for
the crane configuration, the following checks shall be made:
1. Check the electrical wiring connecting the various parts of the system for physical damage.
2. Check the anti two-block switches and weights for free movement.
The following tests shall be performed with care to prevent damage to the machine or injury
to personnel. Proper functioning of the system requires successful completion of these
tests before operating the machine.
If the operator cannot see the load-handling device approaching the boom nose, he shall have an
assistant (signal person) watch the load-handling device. The operator shall be prepared to stop the
machine immediately should the system not function properly as indicated by flashing the warning
symbol, sounding the audible alarm and locking the crane movements, hoist up, telescope out and
boom down. ( if lockout is installed)
3. Check the anti two-block alarm by performing one of the following tests:
o
By manually lifting the weight attached to the anti two-block switches. When the weight is lifted,
the audible alarm should sound, the anti two-block alarm display should flash.
o
Slowly raise the main boom load-handling device to create a potential two-block condition.
When the load-handling device lifts the weight, the audible alarm should sound, the anti two-
block alarm display should flash and the motion of the load-handling device should be stopped.
Lower the load-handling device slightly to eliminate this condition.
o
Slowly lower the boom to create a potential two-block condition. When the load-handling
device lifts the weight, the audible alarm should sound, the anti two-block display should flash
© Hirschmann PRS80 REV. D 11/08/10
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