JLG M450 ANSI Service Manual - Manual (Page 66)

SECTION 3 - CHASSIS & TURNTABLE
3-26 – JLG Lift – 3121127
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 dis-
card seal ring. Inspect commutator for cracks or
burrs, wear, scoring, spalling or brinelling. If any of
these conditions exist, replace commutator and
commutator ring as a matched set.
8. Remove manifold (7) and inspect for cracks surface
scoring, brinelling or spalling. Replace manifold if
any of these conditions exist. A polished pattern on
the ground surface from commutator or rotor rota-
tion 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 disassembly for service. Compare configura-
tion of both sides of the manifold to ensure that same
surface is reassembled against the rotor set.