JLG 1850SJ Service Manual - Manual (Page 135)

SECTION 4 - BOOM & PLATFORM
3121619 – JLG Lift – 4-49
9. Attach an adequate supporting device to the jib to sup-
port its weight. Remove the bolt and keeper pin secur-
ing the jib pivot pin and remove the pin.
10. Remove the jib and platform assembly from the boom.
Installation
1. Attach an adequate lifting device to the jib and position
it in front of the boom.
2. Place something under the front of the jib that will allow
it to slide or move along the ground easily. Attach a lift-
ing device to the rear of the jib, allowing the front to
pivot on the ground.
3. Lift the jib into position on the boom fly section and
install the jib pivot pin. Secure the pin in place with the
keeper pin and bolt.
4. Attach a lifting device to the front of the jib and align
the jib level cylinder attachment fittings. Install the pivot
pin. Apply JLG Threadlocker P/N 0100019 to the bolt
threads and secure the pin in place with the keeper pin
and bolt. Torque the bolt to 165 ft.lbs. (224 Nm).
5. Place the mounting bracket on the jib valve and bolt the
jib valve to the fly boom section.
6. Install the wiring harnesses and hydraulic hoses on the
jib valve as tagged during removal.
7. Install the jib valve protection plate.
8. Perform a boom calibration as described in Section 6
under Calibrating the Boom Sensors.
4.10 JIB
Jib Straight Shimming Procedure
1. Install the Jib Lock Cylinder and fully extend the rod
through the bearing housings in the jib rotator and jib
pivot.
2. Alight the jib pivot straight with the jib assembly.
3. Insert the shim between the wear pad and the pivot pad
mount.
4. Add enough shims as required to fill the gap between
the wear pad and the edge of the bottom plate of the jib
rotator.
5. Only shim until the thinnest shim can not fit. Do not
over shim. This will cause jib pivot and jib assembly mis-
alignment.
6. When shimmed properly, the jib pivot should line up
straight with the jib assembly as shown below.
WITH JIB ASSEMBLY AS SHOWN