Operational Tests - PSR PAT ANTI-TWO-BLOCK Installation, Operator’s & Troubleshooting Manual

INSTALLATION, OPERATOR'S & TROUBLESHOOTING MANUAL
6

OPERATIONAL TESTS

The operation test will test and verify the anti-two- block switch(es)is (are) functioning properly. This
test should be completed periodically or any time there is an indication of uncertainty for operation.
The following tests must be performed carefully to prevent personal injury or damage to the
machine. Proper system functioning requires successful completion of these tests before
operating the machine.
If the operator cannot clearly see the hook block approaching the boom head, an assistant
must watch the hook block.
The operator should be prepared to stop the machine immediately, if the system fails to
function properly by lighting the red warning light and /or sounding the audible alarm.
1. Start the crane in accordance with crane operator's manual.
2. Verify that the anti-two-block indicator and audible alarm function properly by manually lifting the
weight attached to the A2B switches on the crane. When the weight is lifted, the audible alarm
should sound, and the anti-two-block alarm light should light. (See SAE J1305 for two-block
warning and limit system operation)
3. Slowly raise the main boom hook block to bring it into contact with the A2B switch weight.
NOTE: 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 if the system fails to function properly by lighting the red
warning light, sounding the audible alarm and locking the hoist up function.
When the hook block contacts the weight, the red anti-two-block indicator should light and the
audible alarm should sound. NOTE: The hoist up function of the crane will be disabled. Lower the
hook block to eliminate the two-block condition.
If the light and audible alarm do not function as described and the crane movements are not
stopped, the system is not working properly. The malfunction must be corrected before
operating the crane.
ANTI-TWO-BLOCK