JLG 450A_AJ Series II Service Manual - Manual (Page 226)

SECTION 4 - BOOM & PLATFORM
4-14 – JLG Lift – 3121290
4. Use seal tool in a circular motion to install main pressure
seal (13) on shaft (2) and end cap (4).
5. Install wear guide (14) on end cap (4) and shaft (2).
6. Install inner T-seal (11) in piston (3) using a circular
motion.
7. Install outer T-seal (12) by stretching it around groove in
a circular motion. Each T-seal has 2 back-up rings (see
drawing for orientation).
8. Beginning with inner seal (11), insert one end of backup
ring in lower groove and feed the rest in using a circular
motion. Make sure wedged ends overlap correctly.
9. Repeat for outer seal (12).