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Reference
Only
HOISTS
MLC650 SERVICE/MAINTENANCE MANUAL
5-42
Published 09-09-16, Control # 229-09
Drum 6 Pawl Operation
.
The pawl is controlled by the park switch.
When the drum park is turned on to engage the drum pawl,
the CCMC11 control module sends a 24 V
DC
output to the
drum 6 pawl-in solenoid valve, energizing the solenoid. The
solenoid valve shifts position to route hydraulic fluid from the
accessory pump 9 to the tube end of the cylinder. The
cylinder rod extends, moving the drum pawl to the engaged
position.
When the drum park is turned off to disengage the drum
pawl, the CCMC11 control module sends a 24 V
DC
output to
the drum 6 pawl-out solenoid valve, energizing the solenoid.
The solenoid valve shifts position to route hydraulic fluid from
the accessory pump 9 to the rod end of the cylinder. The
cylinder rod retracts, moving the drum pawl to the
disengaged position.
When the control system is not powered, the drum pawl
solenoid valve moves to the center position, allowing
hydraulic fluid at both ends of the pawl cylinder to return to
the tank. Spring force holds the pawl in the engaged position.
Drum 6 Pawl Limit Switch
Limit Switch Replacement
Removal
1.
Land the load from the drum.
2.
Lockout-tagout the crane.
3.
Remove the screws (5) and the limit switch (1).
4.
Remove the limit switch cover (7).
5.
Disconnect the electrical wires, including the jumper
wire, inside the limit switch (see View C).
6.
Remove the cable restraint connector (6) and carefully
pull the electrical cable and wires from the limit switch.
7.
Loosen the screw (10) and remove the limit switch arm
(2) from the limit switch.
WARNING
Falling Boom Hazard!
Avoid possible injury. Before performing the steps in this
section, land the loads and lower the boom onto blocking
at ground level. There is no positive means of holding the
boom up when the pawl is being serviced.
Содержание MLC650
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Страница 2: ...R e f e r e n c e O n l y ...
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Страница 376: ...R e f e r e n c e O n l y ...