JLG 400S Service And Maintenance Manual page 125

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If the end cover (2) is equipped with shuttle valve com-

ponents, remove the two previously loosened plugs

BE READY TO CATCH THE SHUTTLE VALVE OR RELIEF VALVE COMPONENTS

THAT WILL FALL OUT OF THE END COVER VALVE CAVITY WHEN THE PLUGS ARE

NOTE: The insert and if included the orifice plug in the end cover

(2) must not be removed as they are serviced as an integral

part of the end cover.

6. Thoroughly wash end cover (2) in proper solvent and

blow dry. Be sure the end cover valve apertures, includ-

ing the internal orifice plug, 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.

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

SECTION 3 - CHASSIS & TURNTABLE

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 discard seal

ring. Inspect commutator for cracks or burrs, wear, scor-

ing, spalling or brinelling. If any of these conditions exist,

replace commutator and commutator ring as a matched

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