JLG 1200SJP Service Maintenance Manual page 256

SECTION 4 - BOOM & PLATFORM
28. Remove the trunnion blocks that secure the telescope
cylinder barrel to the inner mid boom section.
29. Attach a lifting device to the telescope cylinder and pull
the cylinder, along with the outer mid extend cables out
of the inner mid boom section. Reposition the lifting
device as necessary to balance the cylinder.
4-22
30. Remove the hardware attaching the outer mid extend
block and remove the block and outer mid extend
cables.
31. Remove the cable retainer plate, cable retainer block,
bushing, and sheave.
– JLG Lift – 3121142