JLG 400S Service And Maintenance Manual page 316

SECTION 4 - BOOM & PLATFORM
16. To remove the main pressure seals (205), it is easiest to
cut them using a sharp razor blade being careful not to
damage the seal groove.
17. Remove the thrust washers (304), from the end cap (4)
and shaft (2).
18. Remove the wiper seal (304.1) from its groove in the end
cap (4) and shaft (2).
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19. Remove the piston O.D. seal (202) from the piston.
20. Remove the piston I.D. seal (200). You may now proceed
to the inspection process.
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