JLG 680S, Service And Maintenance Manual

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SECTION 4 - BOOM & PLATFORM
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6. Install the o-ring (204) and backup ring (207) into the
inner seal groove on the end cap (4).
7. Install the inner T-seal (200) into the piston (3) using a
circular motion.
Install the outer T-seal (202) by stretching it around the
groove in a circular motion.
Each T-seal has 2 backup rings (see drawing for orienta-
tion).
Beginning with the inner seal (200) insert one end of
backup ring in the lower groove and feed the rest in
using a circular motion. Make sure the wedged ends
overlap correctly.
Repeat this step for the outer seal (202).
8. Insert the piston (3) into the housing (1) as shown, until
the outer piston seal (202) is touching inside the hous-
ing bore.