JLG 450A_AJ Series II Service Manual - Manual (Page 285)

SECTION 4 - BOOM & PLATFORM
3121180 – JLG Lift – 4-19
2. Install thrust washer (304) on shaft (2) and end cap (4).
3. Install wiper seal (304.1/green 0-ring) in groove on
shaft (2) and end cap (4) around outside edge of
thrust washer (304).
4. Use seal tool in a circular motion to install main pres-
sure seal (205) on shaft (2) and end cap (4).
5. Install wear guide (302) on end cap (4) and shaft (2).
6. Install inner T-seal (200) in piston (3) using a circular
motion.
7. Install outer T-seal (202) 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 (200) insert one end of
backup ring in lower groove and feed the rest in
using a circular motion. Make sure wedged ends
overlap correctly.