14
INSTALLATION MANUAL FOR 490A
3. Turn the handle slowly until the retainer is
depressed, about 1/32” (1 mm), relieving pres-
sure against the retaining ring.
4. Remove the retaining ring using retaining ring
pliers. Back out the holder until the springs are
loose. Remove the tool. (see Fig. 25)
5. Remove the retainer, spring and slave piston.
Check for nicks or burrs that could cause bind-
ing. (see Fig. 26)
6. Clean the piston in an approved cleaning
solvent. Run a small wire through any holes.
Replace the piston if the ground surface on the
outside diameter is scratched or scored.
NOTE:
BE SURE ALL COMPONENTS ARE
REASSEMBLED IN CORRECT ORDER.
7. Reassemble in reverse order.
8. Use the removal tool to compress the slave
piston and springs down until the retainer is
about 1/32” (1 mm) below the retaining ring
groove (see Fig. 25).
9. Slide the retaining ring over the threaded rod
of the removal tool and reinstall the retaining
ring in its groove. Be sure the retaining ring is
fully engaged in the groove.
10. Remove the tool slowly to ensure proper seat-
ing of retaining ring.
11. Assemble the locknut; do not tighten.
FIG. 25
FIG. 26
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