Kubota K008-3 Workshop Manual page 342

Motor assembly procedure
8) Put in the spacer (21).
9) Apply grease to the X-ring (23) put it in.
10) Insert the spring (15) in the valve and fit in the
sleeve (22). If frictional force of sleeve's O-ring
is large and the spring which is elongated up to
the bottom will not return, push the sleeve
slightly out of the valve hole.
IV-S-86
Courtesy of Machine.Market