JLG T500J Service And Maintenance Manual page 185

Cleaning and Inspection
1. Inspect all seals, backup rings, wipers, and wear rings for
tears, grooves, foreign matter, and excessive wear. Deep
grooves may be an indication of damage to the barrel
bore, rod chrome, or the presence of large particle con-
tamination.
2. Remove the seals, backup rings, wipers, and wear rings
using a soft metal tool (brass or aluminum) with
rounded edges. Use care not to nick or score the sur-
faces of any component, especially the seal grooves.
3. Wipe all components with a lint-free cloth. Plug the bar-
rel opening with a lint-free cloth. Remove any adhesive
remnants from the head gland, barrel, rod, and piston
threads (where applicable) using a soft wire brush. Use
care not to scratch or otherwise damage the critical sur-
faces of any component including seal grooves, barrel
bore, rod chrome, etc.
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SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
4. Inspect the piston and head gland for excessive wear,
cracks, scoring, or any other damage. If wear is present
on the OD of the piston or the ID of the head gland,
check to ensure that the circularity of both dimensions is
within 0.007" (0.177 mm). Beyond this limit the seal per-
formance is compromised and the components must be
replaced.
5. If equipped, the stop tube should be inspected for
cracking and excessive flaring of the ends.
6. Closely inspect the chrome surface of the rod. Any nicks,
gouges, or scratches that penetrate the chrome plating
or result in a sharp edge, which may damage seals, are
cause for rod assembly replacement.
7. Flush the barrel and fluid tube (if equipped), drain, and
wipe dry with a lint-free cloth. Closely inspect bore for
nicks, gouges, or scratches. Replace the barrel assembly
if any of these are present.
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