JLG 450A_AJ Series II Service Manual - Manual (Page 270)

SECTION 4 - BOOM & PLATFORM
4-4 – JLG Lift – 3121180
1. Upper Boom
2. Tower Link
3. Upper Upright
4. Upper Lift Cylinder
5. Upper Tower Boom
6. Tower Link
7. Boom
8. Lower Lift Cylinder
9. Lower Upright
Figure 4-2. Boom Assembly