Main Boom Telescope Cylinder Removal; Main Boom Telescope Cylinder Installation - JLG E450A Service And Maintenance Manual

Main Boom Telescope Cylinder Removal

1. Place machine on flat and level surface, with Main Boom
in the horizontal position.
2. Extend Main Boom until fly attach pin #1 is accessible on
fly.
Figure 5-145. Main Telescope Cylinder Removal
NOTE: The Main Boom weighs approximately 450lbs. (204kg).
3. Support platform end of the Main Boom end with a
prop. Support Main Upright end with suitable lifting
device.
4. Tag, disconnect hydraulic lines to telescope cylinder. Use
suitable container to retain any residual hydraulic fluid.
Cap hydraulic lines and ports.
5. Remove the retaining rings that retain the telescope cyl-
inder rod to the fly boom.
6. Using a suitable brass drift, carefully drive the telescope
cylinder rod pin #1 from the fly boom.
7. Remove the four (4) bolts securing the telescope cylin-
der barrel end to the base boom.
NOTE: Care should be taken when removing the telescope
cylinder, do not leave cylinder rest on powertrack
which could cause damage to powertrack.
8. Using a suitable brass drift, carefully drive the telescope
cylinder pin from the base boom.
9. Attach a suitable sling to the telescope cylinder. Using a
suitable lifting device attached to the sling carefully pull
the telescope cylinder from the boom assembly.
NOTE: The Main Telescope Cylinder weighs approximately 130 lbs.
(46.8kg).
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SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
10. Using another lifting device, support the rod end of the
cylinder and remove the cylinder from the boom assem-
bly.
11. Carefully lift the cylinder clear of the boom assembly
and lower to the ground or suitably supported work
area.

Main Boom Telescope Cylinder Installation

1. Attach a hydraulic power supply to the telescope cylin-
der ports. Using suitable supports or lifting devices at
each end of the cylinder, extend the rod so that the cyl-
inder pin attach holes are the same distance apart as the
boom pin attach holes.
NOTE: The Main Boom weighs approximately 450lbs. (204kg).
2. Using suitable lifting equipment, carefully lower the cyl-
inder to the boom assembly.
NOTE: The Main Telescope Cylinder weighs approximately 130 lbs.
(46.8kg).
3. Using another lifting device, support the rod end of the
cylinder and install the cylinder into the boom assembly.
4. Remove lifting devices from the telescope cylinder.
5. Carefully install the telescope cylinder rod pin #1
through the fly boom and secure it with the retaining
rings.
6. Carefully install the telescope cylinder barrel end to
base, securing cylinder to the base boom with four (4)
bolts and hardware.
7. Remove applicable hydraulic line and port caps and cor-
rectly connect the hydraulic lines to the telescope cylin-
der. Ensure all hoses are correctly routed.
8. Remove boom prop and suitable lifting device. Activate
hydraulic system.
9. Using all applicable safety precautions, operate the
boom functions. Check for correct operation and
hydraulic leaks. Secure as necessary.
10. Check fluid level of hydraulic tank and add as necessary.
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