JLG 450A_AJ Series II Service Manual - Manual (Page 224)

SECTION 4 - BOOM & PLATFORM
4-12 – JLG Lift – 3121290
18. Remove piston O.D. seal (12).
19. Remove piston I.D. seal (11).
Inspection
1. Clean parts in a solvent tank and dry with compressed air
before inspecting. Inspect seal grooves, bearing grooves,
thrust surfaces, rod surface, housing bore, and gear teeth
for surface finish abnormalities.
2. Inspect thrust washers (16) for rough or worn edges and
surfaces. Measure thickness to make sure it is not less
than 0.092" (2.34 mm).