JLG 450A_AJ Series II Service Manual - Manual (Page 286)

SECTION 4 - BOOM & PLATFORM
4-20 – JLG Lift – 3121180
9. Repeat for outer seal (202).
10. Insert piston (3) into housing (1) as shown, until
outer piston seal (202) is touching inside housing
bore.
11. Looking from angle shown, rotate piston (3) until
marks on piston and housing (1) line up as shown.
12. Using a rubber mallet, tap piston into housing to
point where gear teeth meet.