JLG 450A_AJ Series II Service Manual User Manual
Page 87
SECTION 3 - CHASSIS & TURNTABLE
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– JLG Lift –
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5.
Thoroughly wash end cover (2) in proper solvent and
blow dry. Be sure end cover valve apertures are 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 rota-
tion of commutator (5) is normal. Discoloration indicates
excess fluid temperature, thermal shock, or excess speed
and requires system investigation 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 commutator and commu-
tator ring as a matched set If any of these conditions
exist.
.
1.
Remove manifold (7). Inspect for cracks, surface scoring, bri-
nelling, or spalling and replace if any of these conditions 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.