Manual

Page 12
LAKOS SST & PRO II Installation and Operations Manual
3 Draintheltersystemcompletelyofallwater.Itisbesttoopenacouplingconnectiononoutlet
manifoldoftheltersystemtoensurethatallwaterisdrainedfromthelowestpointofthelter
system.
4 Allsystems:Cleanthey-straineronthewateruptakekit.
5. Foroptimumlifeexpectancy,lubricatetheinternalshaftofeachLAKOSBackwashValve.Remove
the solenoid (automatic systems only) or manual 3-way valve (manual systems only) from the
backconnectionofthebackwashvalvebody.Removethesystembackwashlinetogainaccess
tothebackwashoutletofthevalves.Injectairintothebackportofeachbackwashvalve(about
20-25psi)inordertopushtheinternalshaftofthebackwashvalveintothebackwashingposition.
Thisexposestheinternalshafttoaccessviathebackwashoutlet.Maintainthispositionandapply
lubricant onto the shaft. Release the air pressure and allow the lubricated shaft to recede into
thebodyofthebackwashvalve,lubricatingtheinternalo-rings.Re-attachthesolenoidsor3-way
valvesandbackwashline.
Backwash Valve Repair Recommendations
REMOVE THE BACKWASH VALVE FROM THE SYSTEM
1. Beginbyremovingthebackcoverfromthevalve.Thiswilleliminatetheneedtoremovethe
solenoid,conduit&wiring.
2. Inspect the rubber diaphragm covering the piston. The “smooth and shiny” side of this
diaphragmshouldbefacingthebackcoverofthevalve;thecloth-likeroughsurfaceshould
bewrappedaroundthepiston.Checkfortears,wearoranyholesinthispart.Replaceif
necessary.
3. Loosenandremovethethreegroovedcouplingstoreleasethevalvebodyfromthetankand
inlet/backwashmanifolds.
INSPECT / REPLACE THE DISC
1. Locate(fromthebackwashopeningofthevalvebody)the7/16-inchmachinedportionofthe
backwashvalve’sshaft.Securethatshaftwithawrenchtopreventitfromrotating.
2. Usingtheappropriateratchetwithextension,enterthevalvebodyfromtheinletopeningand
loosentheendnut.Discisremovedviathevalve’soutlet(totheltertank).
3. Inspect the rubber on the disc. If it is worn, torn or deformed, it should be replaced.
REMOVE THE SHAFT
Thisprocedurewilllikelydamagethediaphragm.Bepreparedtoreplacethediaphragm.
1. Graspthepistonandpullitstraightoutofthebackofthevalvebody.Theshaftwillfollow.
2. Inspectthepistonfordamageoftheepoxycoating.Ifanynicksorscratchesarenoted,
replace the piston.
3. Toremovetheshaftfromthepiston,rstsecurethecentersectionoftheshaft(where
machined)witha7/16-inchwrenchtopreventrotation.Usinga5/32-inchallenwrench,loosen
and remove the pan-head screw located on the face of the piston.
4. Remove the spring. The spring should have a tension of approximately 60 to 70 foot-pounds
ofpressure.Normallifeexpectancyis5to7years.Replacementduringmaintenancemaybe
more cost-effective than trying to overextend the life of this part.
5. Remove the two o-rings on the shaft (these should be replaced whenever servicing the valve)
and inspect the shaft for any rough surfaces. Replace if evident.
6. Wipe all re-usable parts with a clean cloth.