JLG E450A Service And Maintenance Manual page 82

SECTION 3 - CHASSIS & TURNTABLE
7. Remove commutator (5) and seal ring (3) Remove seal
ring from commutator, using an air hose to blow air into
ring groove until seal ring is lifted out and discard seal
ring. Inspect commutator for cracks or burrs, wear, scor-
ing, spalling or brinelling. If any of these conditions exist,
replace commutator and commutator ring as a matched
set.
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8. Remove manifold (7) and inspect for cracks surface scor-
ing, brinelling or spalling. Replace manifold if any of
these conditions exist. A polished pattern on the ground
surface from commutator or rotor rotation is normal.
Remove and discard the seal rings (4) that are on both
sides of the manifold.
NOTE: The manifold is constructed of plates bonded together to
form an integral component not subject to further disas-
sembly for service. Compare configuration of both sides of
the manifold to ensure that same surface is reassembled
against the rotor set.
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