SECTION 9
STEERING
housing. With the spool assembly in this flush position,
check for free rotation within the housing by turning with
light finger force at the splined end (see figure 9-46). Hold
the parts in this flush position and rest the 14 hole end of
the assembly on the protective block on the vise and
clamp lightly across the port face with the vise.
NOTE: It is good service policy to replace all seals when
unit is reassembled. They are available in kit
form.
NOTE: Do not force the spool into the housing if it will not
slide In freely. The assembly tolerance is so close
that the temperature of your hand can expand
metal of the spool enough that it will not slide in
FIGURE 9-48
the housing.
I. Check the condition of the o-ring seal on the
check plug and replace it if necessary. Install the check
plug in the check hole with a steady pressure while
rocking it slightly so that the o-ring feeds in smoothly
without cutting (see figures 9-47 and 9-48).
m. Position the cap locator bushing with large O. D.
chamfer UP partly into end of housing (see figure 9-49).
Insure that it seats against spool assembly flat and
smooth by rotating with finger tips.
n. Check the mounting plate and shaft seal carefully
to insure that they are clean and in good condition. Insure
that the mounting plate seal grooves are clean and
smooth. Each of these seals are slightly larger than its
FIGURE 9-49
seal grooves so that they will be adequately retained in
service. Push each gently into place and smooth down
into seal groove with finger tip (see figure 9-50).
o. Thin oil seal at exterior of mounting is a dirt
exclusion seal and does not generally need replacement.
If this is replaced, it should be pressed into counterbore
so that the lip is directed away from the unit.
p. Place the mounting plate sub-assembly over
spool shaft and slide down into place over cap locator
bushing smoothly so that seals will not be disrupted in
assembly (see figure 9-51). Be certain that the mounting
plate rests fairly flush against the end of housing
assembly so that the cap locator bushing is not cocked
FIGURE 9-50
and install four mounting plate capscrews. Tighten these
evenly and gradually to a torque setting of 21 ft.-lbs. (2.9
kg-m)
(see
figure
9-14.
FIGURE 9-51