JLG T350 Service Manual - Manual (Page 109)

SECTION 3 - CHASSIS & TURNTABLE
3121198 – JLG Lift – 3-73
6. Thoroughly wash end cover (2) in proper solvent
and blow dry. Be sure the end cover valve apertures,
including the internal orifice plug, are free of con-
tamination. Inspect end cover for cracks and the 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 the commutator (5) is normal. Discolor-
ation would indicate excess fluid temperature, ther-
mal shock, or excess speed and require system
investigation for cause and close inspection of end
cover, commutator, manifold, and rotor set.
7. Remove commutator ring (6). Inspect commutator
ring for cracks, or burrs.
8. 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.
9. 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.