JLG 450A_AJ Series II Service Manual - Manual (Page 126)

SECTION 3 - CHASSIS & TURNTABLE
3-76 – JLG Lift – 3121180
free of contamination. Inspect end cover for cracks
and bolt head recesses for good bolt head sealing
surfaces. Replace end cover as necessary.
NOTE: A polished pattern (not scratches) on the cover from
rotation of commutator (5) is normal. Discoloration
would indicate excess fluid temperature, thermal
shock, or excess speed and require system investi-
gation for cause and close inspection of end cover,
commutator, manifold, and rotor set.
6. Remove commutator ring (6) and inspect for cracks
or burrs.
7. Remove commutator (5) and seal ring (3). Remove
seal ring from commutator. Use an air hose to blow
air into ring groove until seal ring lifts out. Discard
seal ring. Inspect commutator for cracks or burrs,
wear, scoring, spalling, or brinelling. Replace com-
mutator and commutator ring as a matched set If
any of these conditions exist.
.
1. Remove manifold (7). Inspect for cracks, surface scor-
ing, brinelling, or spalling and replace if any of these con-
ditions exist. A polished pattern on the ground surface
from commutator or rotor rotation is normal. Remove
and discard seal rings (4) on both sides of manifold.
NOTE: Manifold consists of plates bonded together and
cannot be disassembled. Compare both sides of
manifold to ensure same surface is reassembled
against rotor set.