National Crane Published 10-30-2014 Control # 040-09 2-11
1400H OPERATOR AND SERVICE MANUAL OPERATING CONTROLS
4. Turn the flag for best visibility for the operator (5).
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 flag down (3) and then left (4) to remove it from
the anti-two-block switch. Release the cable.
3. For storage, clip the flag to the switch using the provided
spring clip (5) attached to the switch.
Pre-Operation Inspection and Calibration Verification
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.
3. Check the spring-loaded cable reel to be sure it is free to
rotate, has tension and the cable is reeled properly.
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 RCL system not function properly as indicated by lighting
the red warning light, sounding the audible alarm and locking
the crane movements, hoist up, telescope out and boom
down.
Check the anti-two-block alarm light and the audible
alarm by performing one of the following tests:
• 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
light should light.
• 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 light should light and the
motion of the load handling device should be stopped.
Lower the load handling device slightly to eliminate this
condition.
• Slowly extend (telescope) 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 alarm light should light and the boom
telescope out function should be stopped. Lower the
load handling device slightly to eliminate this condition.
MOVE FLAG
DOWN
PULL CABLE
MOVE FLAG
DOWN & LEFT
PULL CABLE
OUT OF SWITCH
FIGURE 3
REMOVAL OF ANTI-TWO-BLOCK RETAINER
FIGURE 4
RETAINER IN STORAGE POSITION
SPRING CLIP
CLIP FLAG TO
SWITCH
(REF) SPRING
CUP IN OPEN
POSITION
DANGER
!
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