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MAINTENANCE
4.9.4
HYDRAULIC ACCESS LADDER - CHECK SAFETY SENSOR
Legend for illustration Z 23018
(A)
Access ladder in lowered position
(B)
Access ladder in upper position (Working position)
(C)
Stop bar
(D)
Manual actuator for fire suppression system (if so equipped)
(E)
Pull chain for emergency lowering of the access ladder
Use this chain only in emergency cases, when the Operator
does not respond to other communication signals.
(S84)
Ladder control switch for lowering the ladder
(S84B)
Ladder control switch for lifting the ladder
(S84A)
Safety switch for emergency lowering of the access ladder. When the chain (E) is being
pulled down with the engine running, the pilot control system is made inoperative, pre-
venting further movements of the Shovel.
(S22)
Safety sensor, located on ladder pivot bracket
Function of sensor (S22): Cut out of the pilot control system and actuation of the
hydraulic swing brake with the ladder in lowered position.
(S91)
Monitor and control sensor
Function of sensor (S91):
This sensor monitors the ladder position and controls the moving speed of the ladder. In
case the sensor (S22) fails to function properly, the sensor (S91) prevents unintended
movement of the ladder.
(S33A)
Emergency shutdown switch for both engines
Check Safety Sensor (S22) as follows:
With the ladder completely lowered (position A) start the engine.
Hold an iron part (screw driver) in front of sensor (S22).
The ladder must not start to move.
If the ladder starts to move, immediately remove the iron part from
the sensor.
Inform the Service Staff about the malfunction of the lad-
der sensor.
DO NOT operate the Excavator before the failure has
been eliminated and the sensors function properly.
CAUTION
WARNING
4.9 EVERY 50 OPERATING HOURS OR WEEKLY
355
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