SECTION 4 - BOOM & PLATFORM
4-20 – JLG Lift – 3121813
Inspection
1. Clean all parts in a solvent tank and dry with com-
pressed air prior to inspecting. Carefully inspect all
critical areas for any surface finish abnormalities:
Seal grooves, bearing grooves, thrust surfaces, rod
surface, housing bore and gear teeth.
2. Inspect the thrust washers (304) for rough or worn
edges and surfaces. Measure it’s thickness to make
sure it is within specifications (Not less than 0.092”
or 2.34 mm).
3. Inspect the wear guide condition and measure thick-
ness (not less than 0.123” or 3.12 mm).
Assembly
1. Gather all the components and tools into one loca-
tion prior to re-assembly. Use the cut away drawing
to reference the seal orientations.
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