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EMERGENCY PROCEDURES
In the event the unit is damaged while a man is in the air, or an emergency arises after he has gone aloft, immediately rotate the
bucket away from any dangerous obstruction into a clear line of descent when the booms are lowered. The machine should be
operated through the shortest cycle possible to get the bucket on the ground, then operated from the lower controls to finish
storing the booms. Possible conditions and suggested procedures:
PLATFORM CONTROL STATION SWITCH FAILURE
Should any control movement not stop when the control switch is released, immediately release the DOWN OVERRIDE-OFF-
ENABLE switch. Activate the control switch to the opposite position and turn the power back ON to test the switch for proper
function.
The DOWN OVERRIDE switch at the Platform Control Station allows the operator to use the DOWN functions in the event of
an electrical system malfunction. Hold the switch to the DOWN OVERRIDE position and activate the down controls to lower
the booms.
LOWER CONTROL STATION SWITCH FAILURE
Should any control movement not stop when the control switch is released, immediately release the LOWER CONTROL station
override switch. Hold the control switch to the opposite position and activate the station override to test the switch for proper
function.
EMERGENCY STOP SWITCHES (S/N: 42060 & Above)
Emergency Stop switches are located at both the Platform Control Station and the Lower Control Station (See Figures 1-4A &
1-5A). To shut off power to the system, either Emergency Stop switch may be activated. The Platform Control Station has an
Emergency Stop toggle switch. To shut off power, activate the toggle switch to the Emergency Stop position. To resume
operation, place the toggle switch in the Enable position. The Lower Control Station has a red Emergency Stop pushbutton,
located below the main control switches. To shut off power, depress the red pushbutton. To resume operation, twist the red
Emergency Stop pushbutton clockwise to disengage.
IMPORTANT: ACTIVATING THE EMERGENCY STOP SWITCH AT THE LOWER CONTROL STATION,
COMPLETELY SHUTS OFF POWER TO THE ENTIRE SYSTEM. ALL SYSTEM CONTROLS ARE DISABLED WHEN
THE LOWER EMERGENCY STOP PUSHBUTTON IS ACTIVATED.
HYDRAULIC LINE FAILURE
The hydraulic system on the 542 KB has a holding valve that prevents the upper cylinder from collapsing in the event of a
hydraulic line failure. If a partial line failure is experienced (split, cracked, or badly leaking hose), where the holding valve does
not lock, use the controls in short intervals to store booms. Should a complete line failure occur, the holding valve will lock and
can only be released by repair of the line failure. In an emergency, the Emergency Down controls (see Figure 1-6) may also be
used to bring the upper boom down.
BUCKET OPERATOR DISABLED
Hold the station override switch at the Lower Control Station to the LOWER CONTROL position. Using the controls at the base,
rotate the booms clear of any obstructions, and lower the upper boom to the ground. Operate the machine through the shortest
cycle possible to get the bucket on the ground.
POWER FAILURE
In the event of a system battery failure, standby power can be easily obtained from a car or truck system by using jumper cables
(See Figure 2-1). If a defect occurs beyond batteries which require manual operation, the following procedure can be used:
1.
The upper boom can be lowered by releasing the upper-cylinder fluid through one of the Emergency Down switches (See
Figure 1-6).
2.
Booms can be rotated manually as follows: Remove the rotation drive motor belt, then rotate drive pulley, item 18 in Figure
8-4, until the boom is above the stored position.
4520362-1/0302
Courtesy of Crane.Market
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