14
G5-991-400B
G/H-25 Service (Fluid End)
5B. Prime Hydraulic Cells
on Kel-Cell Pumps (Cont’d)
Method #1 (with system head pressure
less
.
than 2 psi)
.
a.. Install. valve. plate. (18). without. outlet. valves. (leave.......
seats.(1).installed).onto.cylinder.housing.(5)..Tighten.
two.socket-head.screws.(39).
.
b.. Remove.oil.cap.(8).and.fill.reservoir.with.correct.Hydra-
oil.to.top.of.fill.port.
.
c.. With.blunt.pointer.(eraser.end.of.pencil),.reach.in.through.
each. outlet. valve. port. and. push. follower-diaphragm.
backwards..Note.air.bubbles.coming.out.at.oil.fill.port..
Now.turn.shaft.about.1/.turn.
.
d.. Repeat. depressing. diaphragms. and. rotating. shaft.
(approximately.4.to.6.times).until.no.more.air.bubbles.
escape.and.oil.has.dropped.about.1.inch.(5.mm).from.
top.of.fill.port..Hydraulic.cells.are.now.primed..Replace.
oil.cap.(8).
.
e.. Install.outlet.valve.assemblies.in.each.outlet.valve.port...
See.parts.illustration.for.correct.assembly.order..You.may.
have.to.tip.pump.(head.upward).in.order.to.keep.valve.
centered.on.seat.(1).and.allow.retainer.(16).to.fit.flush.
in.port..
.
f.. Install.manifold.(7).and.complete.installation.
Method #1 Alternative (with system head
pressure
less
than 2 psi)
.
a...With. pump. horizontal,. and. fluid-end. head. removed,.
remove.oil.cap.(8).and.fill.reservoir.with.correct.Hydra-
oil..Have.catch.basin.for.oil.leaks.from.behind.diaphragms.
when.priming..Catch.oil.and.dispose.of.properly..
Do not
reuse
.
.
b.. Force.air.out.of.oil.in.hydraulic.cell.(behind.diaphragms).
by. turning. shaft. and. pumping. piston.. (A. shaft. rotator.
is.included.in.the.Wanner.Tool.Kit.).Keep.pressure.on.
diaphragms.while.turning.shaft.until.bubble-free.flow.of.
oil.comes.from.behind.all.diaphragms..Watch.oil.level.
in.reservoir..If.oil.gets.too.low.during.priming,.air.will.be.
drawn.into.pistons.(inside.hydraulic.end).and.cause.pump.
to.run.rough..
.
c.. Quickly.attach.assembled.valve.plate.(18).(before.oil.runs.
out.past.diaphragms).with.socket.head.screw.(39)..Do.
not.tighten.screw.completely..Leave.gap.between.valve.
plate.and.cylinder.housing.(5)..Turn.shaft.-3.turns.to.
force.out.any.remaining.air.behind.diaphragms..Hydraulic.
cells.are.now.primed..Complete.valve.plate.installation.
with.two.socket.head.screws.(39).and.add.pump.mani-.
fold.(7).
.
d.. Wipe.off.excess.oil.from.around.pump.head.
.
e.. Check. that. oil. level. is. 1. inch. (5. mm). from. top. of. fill.
port.
.
f.. Replace.oil.cap.(8).and.complete.installation..
Method #2 (with system head pressure
greater
than 2 psi)
.
.
NOTE: This simple and clean method of priming the
Hydra-cells requires an inlet head pressure of at
least 5 feet (1.5 m) or 2 psi (.14 bar). This pressure is
required to hold the diaphragms back while the piston
moves to force out the air.
a.. Completely.assemble.pump.
.
b.. Remove.oil.cap.(8).and.fill.reservoir.with.correct.Hydra-oil.
to.top.of.fill.port..
.
.
When
tank head pressure
is being used to prime, use
the following steps:
.. c.. Install.pump.in.system.and.connect.tank.supply.line.to.
pump.inlet..Connect.pump.discharge.line..Leave.end.of.
line.open.to.allow.air.to.pass.out..
.
d.. Slowly.turn.pump.shaft.by.hand.and.watch.for.bubbles.at.
oil.reservoir.fill.opening..This.will.take.several.rotations..
When.no.more.bubbles.come.out.and.reservoir.level.has.
dropped.about.1”.(5.mm),.hydraulic.cells.are.primed.
.
e.. Replace.oil.cap.(8).and.complete.installation.
.
.
When
compressed air
is being used to prime, use
the following steps
:
.
c.. Insert. clean. air. hose. to. pump. inlet. and. restrict. pump.
outlet.. Turn. shaft. quarter. turn. and. apply. air. pressure.
into.manifold.to.put.pressure.on.diaphragms..Note.air.
bubbles.at.reservoir.opening..Repeat.for.several.rotations.
until.no.more.air.bubbles.come.out.and.reservoir.level.
has.dropped.about.1”.(5.mm)..Hydraulic.cells.are.now.
primed.
.
d.. Replace.oil.cap.(8).and.complete.installation.
6. Reinstall Valve Plate (18), and
Manifold (7)
.
a.. Install.valve.assemblies.in.valve.plate.(18).as.outlined.in.
paragraph.,.step.e...
.
b...Install.valve.plate.(18).on.cylinder.housing.(5).with.three.
cap.screws.(39)...
.
c....Reinstall.O-rings.(8,.9,.and.10).between.valve.plate.and.
manifold. (7).. (See. illustrations. to. determine. which. O-
rings.to.use.depending.on.pumping.head.material.).Use.
petroleum.jelly.or.lubricating.gel.to.hold.them.in.place.
.
d...Reinstall.manifold.(7).onto.valve.plate.(18)..Be.sure.drain.
plug.(4).is.at.bottom.of.manifold..If.pumping.head.is.non-
metallic,.support.plate.(43).is.also.used.
.
e...Insert. all. bolts. (5),. washers. (6),. and. nuts. (31). around.
edge. of. manifold,. and. centerbolt. (1). with. washer. ()..
Hand.tighten.
.
f...
H-25 (external centerbolt models only
).. Install.
centerbolt. (1),. with. washer. (),. and. tighten.. Torque. to...
60.N-m.
.
For Model H-25
.
g...Torque.centerbolt.to.45.ft-lbs.
.
h...Alternately.tighten.opposite.bolts.(5).until.all.are.secure...
Torque.to.45.ft-lbs.
.
For Model G-25
.
g...Alternately.tighten.opposite.bolts.(5).until.all.are.secure...
Torque.to.60.N-m.
.
h...Torque.centerbolt.to.60.N-m.
