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SECTION 4 - BOOM & PLATFORM
protected prior to installation. Replace pins as neces-
sary.
5. Inspect inner diameter of rotator attach point bearings
for scoring, distortion, wear, or other damage.
6. Inspect all threaded components for damage such as
stretching, thread deformation, or twisting. Replace as
necessary.
7. Inspect structural units of jib boom assembly for bend-
ing, cracking, separation of welds, or other damage.
Replace boom sections as necessary.
Assembly
1. Align lift cylinder assembly and rotator with jib assem-
bly. Using a soft head mallet, install cylinder pin into jib
assembly and secure with mounting hardware.
2. Align rotator with jib assembly. Using a soft head mallet,
install rotator pin into jib assembly and secure with
mounting hardware.
3. Align lift cylinder assembly and jib pivot with jib assem-
bly. Using a soft head mallet, install pin into jib assembly
and secure with bushings and mounting hardware.
4. Align jib pivot with jib assembly. Using a soft head mal-
let, install pin into jib assembly and secure with bush-
ings and mounting hardware.
Installation
1. Attach an adequate lifting device to the jib and platform
assembly and position it in front of the fly boom.
2. Place something under the front of the jib and platform
assembly that will allow it to slide or move along the
ground easily. Attach a lifting device to the rear of the
jib, allowing the front to pivot on the ground.
3. Lift the jib and platform assembly into position on the
boom fly section and install the pin. Secure the pin in
place with the bolt and pin keeper.
4. Align level cylinder assembly with fly boom and install
pin. Secure the pin in place with the bolt and pin keeper.
5. Connect hydraulic lines to the level cylinder as tagged
during removal.
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4.6 BOOM CLEANLINESS GUIDELINES
The following are guidelines for internal boom cleanliness for
machines that are used in excessively dirty environments.
1. JLG recommends the use of the JLG Hostile Environment
Package if available to keep the internal portions of a
boom cleaner and to help prevent dirt and debris from
entering the boom. This package reduces the amount of
contamination which can enter the boom but does not
eliminate the need for more frequent inspections and
maintenance when used in these types of environ-
ments.
2. JLG recommends that you follow all guidelines for ser-
vicing your equipment in accordance with the instruc-
tions outlined in the JLG Service & Maintenance Manual
for your machine. Periodic maintenance and inspection
is vital to the proper operation of the machine. The fre-
quency of service and maintenance must be increased
as environment, severity and frequency of usage
requires.
3. Debris and foreign matter inside of the boom can cause
premature failure of components and should be
removed. Methods to remove debris should always be
done using all applicable safety precautions outlined in
the JLG Service & Maintenance Manuals.
4. The first attempt to remove debris from inside the boom
must be to utilize pressurized air to blow the debris
toward the nearest exiting point from the boom. Make
sure that all debris is removed before operating the
machine.
5. If pressurized air cannot dislodge the debris, then water
with mild solvents applied via a pressure washer can be
used. Again the method is to wash the debris toward the
nearest exiting point from the boom. Make sure that all
debris is removed, that no "puddling" of water has
occurred, and that the boom internal components are
dry prior to operating the machine. Make sure you com-
ply with all federal and local laws for disposing of the
wash water and debris.
6. If neither pressurized air nor washing of the boom dis-
lodges and removes the debris, then disassemble the
boom in accordance to the instructions outlined in the
JLG Service & Maintenance Manual to remove the
debris.
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