1
H5-991-406A
H/G-25-SD Service (Fluid End)
Reinstall the Valve Assemblies
a...Clean.the.valve.ports.and.shoulders.in.the.valve.plate.(18).
with.water.or.a.compatible.solvent..A.ScotchBrite™.pad.or.
brush.may.be.used.to.abrade.any.old.buildup.or.residue,.
but.be.careful.not.to.scratch.the.plastic.or.wear.away.any.of.
the.plastic.valve.plate.material..Rinse.the.valve.plate.after.
cleaning. and. lubricate. the. valve. ports. with. a. compatible.
grease,.oil,.or.lubricating.gel.such.as.petroleum.jelly.
.
Caution: If the elastomers are made of EPDM, do not
use a petroleum-based lubricant on them. Instead, use
an EPDM-compatible lubricant. If the product is food-
grade, use a compatible food-grade lubricant.
b...Install.new.O-rings.(11).and.seats.(3).into.each.valve.seat.
holder.(1)..Lubricate.the.O-rings.
c... Install.new.polyurethane.washers.(17,.44).into.each.spring.
retainer.recess.and.each.valve.recess,.respectively..Install.
the.spring.retainers.(16).into.their.shells.(45).before.installing.
the.polyurethane.washers.in.the.retainers.
.
A.small.amount.of.grease.or.petroleum.jelly.should.be.used.
to. help. the. washers. stay. in. place. during. the. rest. of. the.
assembly.procedure..It.is.very.important.that.these.washers.
stay.in.their.proper.place.until.assembly.is.completed..If.they.
do.not,.they.could.end.up.holding.a.valve.open.or.clogging.a.
valve.or.filter.downstream.of.the.pump..In.addition,.they.will.
not.do.their.job.of.minimizing.wear.of.the.spring.retainers,.
springs,.and.valves.if.they.are.not.properly.in.place.
d...Install. a. new. crush. seal. (46). on. three. of. the. shell.
subassemblies.just.completed.above,.for.use.in.the.outlet.
valves..Press.the.spacers.(15).onto.the.crush.seals.to.create.
a.five-piece.subassembly.for.each.outlet.valve..It.is.important.
to.use.new.crush.seals.during.each.rebuilding,.because.they.
hold.the.spacers.to.the.shells.during.subsequent.assembly.
procedures.. Using. new. crush. seals. also. ensures. proper.
compression.on.the.valve.assemblies.when.the.manifold.is.
clamped.to.the.valve.plate.
.
Consult.the.illustration.below.for.proper.orientation.of.the.
spring.retainer.tabs.for.both.the.inlet.and.outlet.valves.
e..
Inlet (3 center valves)
..Insert.the.three.remaining.spacers.
(15).into.the.inner.ring.of.valve.bores.in.the.valve.plate..The.
flat,.flanged.end.must.be.facing.down.toward.the.shoulder.
of.the.valve.plate.
.
Note: You may have to press the spacers slightly, as
there is a line-to-line fit between the outer diameter of
the spacer and the valve bore.
WRONG: Retainer
leg pointing toward
center of pump.
RIGHT
Installing Valve Retainers
Into Valve Plate
W0212
.
Next,.insert.the.remaining.crush.seals.(46).onto.the.nose.
of.the.inlet.valve.spacers..
The seals must fit around the
nose of the spacers.
.
Insert.the.three-piece.shell.subassemblies.(45,.16,.17).into.
the. inlet. valve. bores.. They. too. may. have. to. be. pressed.
slightly,. as. there. is. a. line-to-line. fit. between. the. outer.
diameter.of.the.shell.and.the.valve.bore..Be.sure.the.nose.
of.the.shell.(45).presses.into.the.inner.diameter.of.the.crush.
seal.(46)..The.shaft.rotator.(from.the.Wanner.Tool.Kit).can.
be.used.to.press.down.evenly.on.the.shell.subassembly.to.
get.the.proper.fit.
.
Before. continuing,. check. that. each. polyurethane. washer.
is.in.its.proper.place,.nested.down.into.the.recess.of.each.
spring.retainer.
.
Insert.the.spacers.(47).into.the.valve.bores.so.that.they.rest.
on.top.of.the.shell.subassemblies..Insert.the.springs.(14).
and.valves.(13),.ensuring.that.each.valve.has.a.polyurethane.
washer.(44).pressed.into.its.recess.—.to.minimize.wear.on.
the.valve.and.the.end.of.the.spring.
.
Finally,.press.the.valve.seat.subassemblies.(3,.1,.11).down.
into.the.valve.bores,.compressing.the.valve.spring.slightly..
The. valve. seat. O-ring. should. be. lubricated. with. grease.
or.petroleum.jelly.to.ease.assembly..There.is.substantial.
interference. between. the. O-ring. and. valve. bore,. so. be.
careful.not.to.shear.the.O-ring.by.driving.it.in.too.quickly..
Use.the.seal.inserter.(from.the.Wanner.Tool.Kit).to.push.
evenly.on.the.seat,.rocking.very.slightly,.if.required,.to.ease.
the.O-ring.into.the.bore..Push.down.on.the.valve.until.it.hits.
the.stops.on.the.spring.retainer,.then.let.it.pop.back.up.to.
the.seat.to.ensure.proper.operation.
f...
Outlet (3 outer valves)
..Press.the.three.remaining.valve.
seat.subassemblies.(11,.3,.1).into.the.outer.ring.of.valve.
bores.in.the.valve. plate..The. flat,.metal. end. of.the.valve.
seat.holder.(1).must.be.facing.down.toward.the.shoulder.
of. the. valve. plate.. The. valve. bore. and. O-ring. should. be.
lubricated.with.grease.or.petroleum.jelly.to.ease.assembly..
There.is.substantial.interference.between.the.O-ring.and.
valve.bore,.so.be.careful.not.to.shear.the.O-ring.by.driving.
it.in.too.quickly.
.
Use.the.seal.inserter.to.push.the.seat.into.the.valve.bore.
until.it.is.flush.with.the.plate,.then.use.the.shaft.rotator.and.
push.down.on.the.seats.until.they.hit.the.shoulder.at.the.
bottom.of.each.bore.
.
Insert.the.spacers.(47).into.the.valve.bores.so.they.rest.on.
top.of.the.valve.seats..Place.the.valves.(13).and.springs.(14).
onto.the.seats,.ensuring.that.each.valve.has.a.polyurethane.
washer.(44).pressed.into.its.recess.
.
Finally,.insert.the.five-piece.shell.subassemblies.into.the.
bores,.after.checking.that.each.polyurethane.washer.is.in.
its.proper.place,.nested.down.in.the.recess.of.each.spring.
retainer..You.may.have.to.press.slightly,.as.there.is.a.line-
to-line.fit.between.the.outer.diameter.of.the.shell.and.the.
valve.bore.
.
From.the.other.side.of.the.valve.plate.(through.the.diaphragm.
pocket),. push. on. the. valve. until. it. hits. the. stops. on. the.
spring.retainer,.then.let.it.pop.back.to.the.seat.to.ensure.
proper. operation.. You. may. have. to. lightly. hold. the. shell.
subassembly.in.place.when.doing.this.
