JLG E450A, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121714 3-41
3. Remove the special ring head bolts (1) using an appro-
priate 1/2 or 9/16 inch size socket. Inspect bolts for dam-
aged threads, or sealing rings, under the bolt head.
Replace damaged bolts.
4. Remove end cover assembly (2) and seal ring (4). Discard
seal ring.
5. Thoroughly wash end cover (2) in proper solvent and
blow dry. Be sure the end cover valve apertures are free
of contamination. 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 rota-
tion of the commutator (5) is normal. Discoloration would
indicate excess fluid temperature, thermal shock, or excess
speed and require system investigation for cause and close
inspection of end cover, commutator, manifold, and rotor
set.
6. Remove commutator ring (6). Inspect commutator ring
for cracks, or burrs.