JLG 1850SJ Service Manual - Manual (Page 121)

SECTION 4 - BOOM & PLATFORM
3121619 – JLG Lift – 4-35
9. Repeat steps 1-7 above to install the Section 5/4 assem-
bly into boom Section 3.
10. Repeat steps 1-7 above to assemble the Section 5/4/3
assembly into Section 2.
11. Repeat steps 1-7 above to assemble the Section 5/4/3/2
assembly into Section 1.
12. Complete the boom and machine assembly. The boom
should be functionally tested and evaluated for boom
sweep. If necessary, the boom may be re-shimmed by
moving shims from one side to the other to further cor-
rect any remaining boom sweep. There may be some
instances where no shims are used under a given side
pad to pass the criteria for boom sweep at final inspec-
tion of machine.
4.6 BOOM LUBRICATION APPLICATION
This procedure applies to booms after assembly or during
annual application using Super Lube® lubricant (JLG p/n
3020042).
NOTE: This procedure should also be performed when the tele-
scope in or telescope out functions are not operating
smoothly.
NOTE: This procedure should also be performed when the desired
telescope out length can not be achieved. NEVER increase
telescope out pressure to achieve desired telescope length.
1. Position the boom on the boom rest using the 500lb
capacity setting.
2. Telescope main boom section as far as it will extend at
this position, approximately 3 ft. (0.9 m).
3. From the front of the machine (boom pivot end), moder-
ately apply lubricant to the interior surfaces of boom
sections 1, 2, 3, and 4. To prevent misdiagnosis of
hydraulic leaks, take care to prevent excessive applica-
tion of lubrication.
4. At the rear of the machine, apply lubricant to the side,
top and bottom surfaces of boom sections 5, 4, 3, and 2
specifically to wear pad contact paths. To prevent misdi-
agnosis of hydraulic leaks, take care to prevent excessive
application of lubrication.
5. After application of the lubricant is complete, cycle the
boom through its full range of travel 2 times.
4.7 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.