Haskel 8 Serie Instructions De Fonctionnement Et D'entretien page 8

5.2.3 Reach inside valve body. Remove first plastic
bumper. Carefully pull out spool. Inspect (2) spool
seals and replace any that are damaged, worn or
swollen. If spool cannot be pulled out, remove plug
from opposite end of casting and push spool out with
a rod or screw driver. (Ref. Fig. 4.)
Use a flashlight to inspect second (inner) bumper at
the end of the sleeve. If this bumper is in place put all
parts back as follows.
5.2.3.1 Reinstall hex plug with o-ring. Lubricate spool
seals including pilot piston seal with Haskel p/n
50866 lubricant. (Ref. 2.2.1 Note 54312 severe
service modification should not be lubricated) Insert
pilot piston into spool with bumper hanging loose on
pilot piston shaft. (Ref. Fig. 5.)
Guide in all parts by first inserting small end of spool
into interior of sleeve and seating bumper on end of
sleeve. Secure parts with 57375 retaining screw.
Retest for proper operation. If successful, tighten 581
54 set screw.
5.2.4 If further disassembly is necessary, repeat prior
steps (5.2.1 thru 5.2.3) and then carefully remove
sleeve and second bumper.
NOTE: To remove sleeve, insert a blunt hook tool
(such as tool p/n 28584, brass welding rod or equally
soft metal) into a crosshole in the sleeve, and pull
sleeve from the valve body. (Ref. Fig. 6.)
5.2.5 Inspect (4) o-rings on sleeve and discard any
that are damaged, worn or swollen.
5.2.6 Discard second (inner) bumper if damaged or
worn.
5.2.7 Apply Haskel 28442 Lubricant liberally to all o-
rings. (static seal sleeve o-rings only if 54312 severe
service modification.)
5.2.8 Install inner bumper on bottom of bore in valve
body. Lay sleeve end inner o-ring on inner bumper.
With (2) middle o-rings installed on sleeve, slide
sleeve in against inner o-ring and bumper. Then to "seat" fourth (outer) o-ring evenly into the groove on
the end of sleeve, use bare cap/pilot piston assembly as a seating tool.
5.2.9 Repeat installation of remaining parts per paragraph 5.2.3.1
5.3 Pilot Stem Valves
NOTE: Before repair, test according to paragraph 5.4.
Disassemble pilot valves in the following manner (while referring to your detailed assembly drawing):
8" Drive Liquid Pumps • OM-LP-800F
Figure 4. Pushing from opposite end to
remove valve spool
Figure 5. Cycling valve cap and parts
ready for insertion into valve body
Figure 6. Pulling out sleeve with a hook
on soft metal rod
8