JLG E300 Service Manual - Manual (Page 67)

SECTION 3 - CHASSIS & TURNTABLE
3121253 – JLG Lift – 3-33
3. Remove the special ring head bolts (1) using an
appropriate 1/2 or 9/16 inch size socket. Inspect
bolts for damaged 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 neces-
sary.
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.
6. Remove commutator ring (6). Inspect commutator
ring for cracks, or burrs.
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