JLG 1250AJP Service Manual - Manual (Page 306)

SECTION 4 - BOOM & PLATFORM
4-66 – JLG Lift – 3121171
21. Disconnect the length sensor cables from the tower
boom fly section.
22. Tag and disconnect the electrical lines going to the
upper and lower tower boom length sensors.
23. Remove the bolts and washers securing the length
sensor mounting brackets and remove the sensors
and brackets as an assembly.
24. Tag and disconnect all the hydraulic hoses running
to the tower telescope cylinder. Cap or plug all
openings.
25. Remove the bolts securing the trunnion keeper
blocks and shims and remove the blocks and shims.
26. Place blocking under the tower telescope cylinder to
prevent it from dropping suddenly and begin pulling
the cylinder out of the boom using an adequate lift-
ing device. Reposition the blocks and lifting straps
as needed to prevent the cylinder from dropping
suddenly and to keep it balanced.
NOTE: The tower telescope cylinder weighs approximately
915 lbs. (415 kg).
Installation
1. Place blocking for support under the tower tele-
scope cylinder and begin pushing the cylinder into
the boom using an adequate lifting device. Reposi-
tion the blocks and lifting straps as needed to pre-
vent the cylinder from dropping and to keep it
balanced.
NOTE: The tower telescope cylinder weighs approximately
915 lbs. (415 kg).
2. Position the telescope cylinder trunnions into place
and install the shims and trunnion keeper blocks.
Apply Loctite #242 to the retaining bolts and torque
to 35 ft.lbs. (47.5 Nm).
3. Connect all the hydraulic hoses running to the tower
telescope cylinder as tagged during removal.