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Cleaning and Inspection
1. Clean all metal parts with solvent and air dry.
2. Inspect the plunger (3, Figure 3-4) for wear on the
sides where it moves through the seals. If axial
grooves are seen or if any wear is apparent,
replace the plunger.
3. Place the regulating spool (12) into its sleeve (19).
Push the spool lightly through the sleeve. The
spool must be able to move freely and smoothly
the entire length of the sleeve. If it cannot, it must
be replaced. Never replace just the spool or
sleeve. They must be replaced as a matched set.
4. Inspect each spring carefully for cracks or breaks.
Any spring with a crack or break must be re-
placed. Also, if the valve was not reaching proper
regulated pressure, replace all regulator springs.
5. Inspect the threaded inserts (7, Figure 3-3) in the
actuator base. If any of the threads are damaged,
the inserts must be replaced.
6. Lubricate all parts with a thin coat of clean type
C-4 hydraulic oil. Take care to keep components
protected from contamination.
ASSEMBLY
Actuator Base Threaded Inserts
1. If any inserts (7, Figure 3-3) were removed from
the actuator base (6), position the actuator base
upside down on the work bench and support
directly under each of the four floor mounting
holes.
2. Install the threaded inserts into the actuator base
by tapping lightly with a small hammer until the
insert flanges become flush with the actuator
base. Be sure the base is supported to avoid
breaking the base.
3. Thoroughly clean the actuator base and set aside.
Boot and Cap
1. Examine the boot (2, Figure 3-3) for any cracks,
tears, or other damage. If damage is evident, the
boot must be replaced. To replace the boot, follow
the procedure below.
2. Remove the boot from the actuator cap (1) and
discard the old boot. Thoroughly clean the sides
of the cap by scraping the lip where the cap
contacts the boot. Use a knife or suitable scraper.
Clean thoroughly to remove all adhesive or parti-
cles of the old boot.
J3-6
3. Apply a thin bead of Loctite
upper sides of the cap. Apply the bead to the two
long sides only. Do not apply it to the rounded
ends, these must not be sealed to allow the boot
to "breath".
4. Carefully position the cap into the new boot groove
wiping off the excess glue.
5. Position the boot such that it conforms to the
contour of the cap, then set aside. Adhesive
requires about 30 minutes to cure.
Valve Body Seal Installation
1. Install the poly-pak seal (3, Figure 3-5) in the seal
groove first. Position the seal in the groove so that
the internal O-ring inside the poly-pak seal is
facing down toward the bottom of the valve.
2. Make sure the internal O-ring is still seated inside
the poly-pak seal (3) and did not get dislodged
during installation. Position the poly-pak seal to
the bottom of the groove.
FIGURE 3-5. VALVE BODY SEAL INSTALLATION
1. Actuator Plunger
2. Valve Body
3. Poly - Pak Seal
Brake Circuit Component Service
®
Prism 410 onto the
4. Back-Up Ring
5. Wiper Seal
6. Actuator Base
J03019 1/99
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Troubleshooting
