Manitowoc GROVE RT890E Operator's Manual page 100

SET-UP AND INSTALLATION
MALFUNCTION WHEN WORKING WITH
LATTICE EXTENSION
Malfunction
No function of the lifting limit switch
The main boom cannot be telescoped
with the rigged lattice extension or
boom extension.
The lattice extension can not be
derricked.
MAINTENANCE WORK
Modules in Need of Protection during
Cleaning Work
• Provide protection for the following electrical parts
during cleaning work:
- potentiometer in the joint (1) of the 33 ft (10.1 m)
section
4-38
NOTE:
Cause
Lifting limit switch not connected
Electrical connection between the
boom head and lattice extension and
between 33 ft (10.1 m) section and 23
ft (7 m) section is not established.
Lifting limit switch on the main boom
head not overridden.
When operating with a 56 ft (17.1 m)
lattice extension or boom extension,
the short-circuit plug is not inserted on
the head of the 41 ft (12.5 m) section.
The main boom is derricked to such an
angle at which telescoping is not
permissible
Derricking gear of the lattice extension
is switched off.
-
-
The information in the following table applies to
malfunctions during operation with the 33/56 ft
(10.1/17.1 m) lattice extension.
Connect the lifting limit switch.
Establishing electrical connection.
Override the lifting limit switch on the
main boom head.
Insert short-circuit plug.
Derrick the main boom to the required
angle.
Switch on the derricking gear of the
lattice extension.
the control box at the rear of the 33 ft (10.1 m)
section (2),
the control box at the front of the 33 ft (10.1 m)
section (3),
RT890E
Remedy