JLG 1850SJ, Service And Maintenance Manual, Page: 191 / 712

SECTION 4 - BOOM & PLATFORM
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6. Place boom section 4 on a proper supporting device.
7. Apply Super Lube® lubricant (JLG p/n 3020042) to all 4
sides of the boom approximately 3 to 4 feet on both
ends. Apply Super Lube® to section 5 on the end that
will go into section 4 only. Apply super lube to all outer
surfaces of interior wear pads after they are installed.
8. Avoid getting super lube on painted surfaces. Slide sec-
tion 5 into section 4 using adequate lifting equipment.
NOTE: Apply a thin coat of moly paste (JLG P/N 3020039) on the
inside diameter of the sheave bearing before installation of
sheaves.
NOTE: Ensure the wire ropes remain untwisted through boom sec-
tion 4.
9. Install the sheaves to the front of section 4. Apply JLG
threadlocking compound P/N 0100011to the bolts and
use the bolts, pins, keepers, and washers to secure the
sheaves. Route the wire rope around the sheaves.
10. Install the wire rope retainer blocks to the front of sec-
tion 4 boom using the washers, bolts, and nuts.
11. Install the bottom front wear pads and shims to section
4. Coat the retaining bolts with JLG threadlocking com-
pound P/N 0100011 and secure the wear pads with the
bolts and washers. Torque the bolts to 43 ft.lbs. (58 Nm).
12. Install the front side wear pads and shims to section 4.
Coat the retaining bolts with JLG threadlocking com-
pound P/N 0100011 and secure the wear pads with the
bolts and washers. Torque the bolts to 28 ft.lbs. (38 Nm).
13. Install the front bottom wear pad and shims to section 4.
Coat the retaining bolts with JLG threadlocking com-
pound P/N 0100011 and secure the wear pads with the
bolts and washers. Torque the bolts to 28 ft.lbs. (38 Nm).
14. Install the front top wear pads and shims to section 4.
Coat the retaining bolts with JLG threadlocking com-
pound P/N 0100011 and secure the wear pads with the
bolts and washers. Torque the bolts to 28 ft.lbs. (38 Nm).
15. Install the rear top wear pads and shims to section 4.
Coat the retaining bolts with JLG threadlocking com-
pound P/N 0100011 and secure the wear pads with the
bolts and washers. Torque the bolts to 28 ft.lbs. (38 Nm).
16. Install the section 4 retract wire ropes to the rear of sec-
tion 4.
NOTE: The retract wire ropes must be installed before side wear
pads are installed.
17. Install the rear side wear pads and shims to the outside
of section 4. Coat the retaining bolts with JLG thread-
locking compound P/N 0100011 and secure the wear
pads with the bolts and washers. Torque the bolts to
40.5 ft.lbs. (55 Nm).
18. Install the rear side wear pads to the inside of section 4.
Coat the retaining bolts with JLG threadlocking com-
pound P/N 0100011 and secure the wear pads with the
bolts and washers. Torque the bolts to 28 ft.lbs. (38 Nm).