JLG 1200SJP Service Maintenance Manual page 319

Each T-seal has 2 back-up rings (see drawing for orienta-
tion).
Beginning with the inner seal (200) insert one end of b/u
ring in the lower groove and feed the rest in using a cir-
cular motion. Make sure the wedged ends overlap cor-
rectly.
Repeat this step for the outer seal (202).
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7. Insert the piston (3) into the housing (1) as shown, until
the outer piston seal (202) is touching inside the hous-
ing bore.
8. Looking from the angle shown, rotate the piston (3) until
the marks you put on the piston and the housing (1)
during disassembly line up as shown. Using a rubber
mallet, tap the piston into the housing up to the point
where the gear teeth meet.
– JLG Lift –
SECTION 4 - BOOM & PLATFORM
4-85