JLG 800A_AJ Service Manual - Manual (Page 224)

SECTION 4 - BOOM & PLATFORM
4-10 – JLG Lift – 3120858
b. Remove mounting hardware that secures the
powertrack to tower base boom and remove the
powertrack.
c. Remove mounting hardware from tower boom
telescope cylinder barrel and rod end.
d. Slide the telescope cylinder out of the base
boom, support with an overhead crane or suit-
able lifting device.
e. Remove mounting hardware that secures the
wear pads to the front of tower base boom sec-
tion; Remove the wear pads from the top sides
and bottom of the tower base boom.
f. Using an overhead crane or suitable lifting
device, remove the fly section
Inspection
NOTE: Refer to Section 2, Pins and Composite Bearing
Repair Guidelines.
1. Inspect tower boom pivot pin for wear scoring,
tapering, and ovality, or other damage. Replace pins
as necessary.
2. Inspect tower boom pivot attach points for scoring,
tapering, and ovality, or other damage. Replace pins
as necessary.
3. Inspect inner diameter of tower boom pivot bearings
for scoring, distortion, wear, or other damage.
4. Inspect lift cylinder attach pin for wear, scoring,
tapering, and ovality, or other damage. Ensure pin
surfaces are protected prior to installation. Replace
pins as necessary.
5. Inspect inner diameter of upright attach point bear-
ings for scoring, distortion, wear, or other damage.
Replace bearing as necessary.
6. Inspect all threaded components for damage such
as stretching, thread deformation, or twisting.
Replace as necessary.
7. Inspect structural units of tower boom assembly for
bending, cracking, separation of welds, or other
damage. Replace boom sections as necessary.
8. Inspect powertrack for damage such as cracking,
wear, or other damage. Replace links or assembly,
as necessary.
Assembly
NOTE: When installing fly section wear pads, install same
number and thickness of shims as were removed
during dissembly.
1. Measure inside dimensions of the tower base sec-
tion to determine the number of shims required for
proper fit.
2. Install side, top, bottom wear pads to the aft end of
tower fly section; shim evenly to the measurements
of the inside of the base boom section.
Figure 4-7. Location of Components - Tower Boom Powertrack