JLG 680S, Service And Maintenance Manual

Page: 282 / 530

SECTION 4 - BOOM & PLATFORM
4-18 3121234
4.5 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 to follow all guidelines for servicing
the equipment in accordance with the instructions out-
lined in the JLG Service & Maintenance Manual for the
machine. Periodic maintenance and inspection is vital to
the proper operation of the machine. The frequency of
service and maintenance must be increased as environ-
ment, 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 to comply
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.
4.6 MAIN BOOM ASSEMBLY
Removal
1. Using suitable lifting equipment, adequately support
boom assembly weight along entire length.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDIATELY AFTER DIS-
CONNECTING LINES TO AVOID ENTRY OF CONTAMINANTS INTO SYSTEM.
2. Tag and disconnect hydraulic lines from telescope cylin-
der. Use a suitable container to retain any residual
hydraulic fluid. Cap hydraulic lines and ports.
3. Use an adequate support for the main boom lift cylin-
der. Extend main boom cylinder with auxiliary power
switch to gain access to remove rod end pin.
NOTE: The main boom lift cylinder weighs approximately 615 lbs.
(279 kg).
4. Using a suitable brass drift and hammer, remove hard-
ware securing the main boom lift cylinder rod end pin to
the base boom section. Remove the main boom lift cyl-
inder pin from base boom. Retract the main boom lift
cylinder by using the auxiliary power switch.
5. Using an adequate supporting device, support the tim-
ing link so it doesn’t fall when the pin is removed.