Pentair CX series Instruction And Service Manual
CX SERIES
INDUSTRIAL PUMPS
INSTRUCTIONS AND SERVICE MANUAL
NOTE! To the installer: Please make sure you provide this manual to the owner of the equip ment or to the responsible
party who maintains the system.
Part # 23833A134 | © 2017 Pentair Ltd. | 06/30/17
Reciprocating pumps of both the plunger and piston
type are positive displacement in principle. Due to
positive displacement characteristics, problems may
arise through improper installation or application.
When new or unusual installations are planned, or
the material to be pumped is a liquid other than cold
water, the customer should consult the “Myers®
Reciprocating Pump Manual” or factory for additional
information.
CAUTION
Positive displacement pumps must have a proper
size and operable type of pressure regulating valve or
pressure relief valve piped into the discharge line. This
is mandatory to prevent damage to pump and piping or
possible injury to personnel. Do not install any valves
or shutoff devices in the bypass line from pressure
regulator to tank or supply.
CAUTION
All pumps should be installed level. For mobile
applications the maximum angle of intermittent
operation should be no more than 5 degrees in any one
direction.
CALIFORNIA PROPOSITION 65 WARNING:
accessories contain chemicals known to the
State of California to cause cancer, birth
defects or other reproductive harm.
This product and related
INSTALLATION (Customer mounted pump)
If possible, install suction piping one pipe size larger
than suction tapping in pump. Reduce piping size at
pump with a reducer coupling as shown on installation
drawings. A suction surge arrester will assure
smoother operation. When level of liquid supply is
below that of the pump either the bottom opening or
both side openings must be connected to the supply.
Keep suction piping as short and simple as possible
with a minimum of lift. Avoid any high points in suction
line.
Suction piping must not have any air leaks. Check
suction piping assembly for leaks by using 20-80
psi air pressure and soap bubbles or submerging
assembly under water.
When pumping liquids that are heated, reduce
pump speed to avoid suction problems. Consult
“Myers Reciprocating Pump Manual” or factory for
temperature and speed limitations.
Make sure that drive is adequate for horsepower
required and that drive is properly aligned and
tensioned. With belt drives, pulleys on both motor
and pump should be located as closely as possible to
bearing to reduce bearing and shaft bending loads.
CAUTION: Be sure that pump belts and pulleys are
properly protected by guards according to industrial
code within state of application.
Make sure that all bolts, nuts, set screws and keys are
properly tightened. Be sure that the discharge line is
properly protected by means of a pressure regulating
valve and a discharge surge arrester of proper size,
capacity and pressure rating. The discharge line
should be of comparable size to discharge tapping in
pump.
Nozzle capacity or demand should not exceed 90%
of pump capacity for satisfactory regulating valve
operation. Nozzling in excess of this capacity may
cause unstable pressure regulator operation. It is also
preferred to nozzle in excess of 50% of pump capacity
to reduce rate of erosion or wear on regulating valve
and seat.
When lower system demands (than rated pump
capacity) are required in an installation, the pump
speed should be reduced by changing drive ratios.
This will reflect savings in power consumption, reduce
regulating valve wear and extend pump life.
Where line shock or water hammer is encountered
a second surge arrester should be installed in the
discharge line adjacent to spray gun or nozzles. Under
some conditions it may also be desirable to isolate
pump from piping with suitable high pressure hose.
This will eliminate transmission of line vibration to the
pump, with a resulting possible failure of piping, pipe
threads, and/or pump casting.
Never pipe the bypass from a pressure regulating valve
back into the pump suction. When discharge line is
shut off, the complete bypass is circulated back into
pump suction with a resulting rapid temperature rise
which will destroy the plunger seal/piston packing.
Use suction strainer and screen of adequate size
to avoid restriction of pump suction. Strainer mesh
should be sufficiently small to prevent passage of
trash which may lodge under pump valves. Keep
screen clean with a regular maintenance schedule
to avoid starving of pump suction. A starved suction
condition is usually indicated by excessive pump shock
and noise. Many pump problems and most plunger or
packing problems are directly traceable to a starved
suction condition.
23833A134 06/30/17
It is permissible to pipe the bypass from an unloader
valve into the suction because the pump pressure is
unloaded when discharge is shut off.
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STARTING PUMP
Read all instructions carefully. Fill pump crankcase
with recommended oil to the level mark on oil saber.
Oil recommendations are covered in the lubrication
section of pump instructions. Replace all drain plugs
in pump and piping. Inspect tank to be sure that no
foreign material is in the tank or suction line. Fill tank
at least half full or connect suction to water supply.
Open valve (if present) in suction line. If pumping from
a pit, make sure that the suction line is completely
submerged. Make sure all valves, including spray gun
or nozzles, are open in discharge line. Spray gun may
be anchored to discharge back into tank. Completely
back off pressure adjusting screw on pressure
regulating valve.
CAUTION: When pumping from a pit or under a suction
lift condition, if pump does not prime in a short period,
fill the discharge side of the fluid end with water to
seal discharge valves. If pump still does not prime,
remove suction hose and fill pump with water. Dry
operation will cause heating and wear on plunger seal.
Be sure that an operating pressure gauge is located on
the discharge line.
STARTING THE UNIT
After starting, close discharge valve or spray gun
slowly while watching pressure gauge to make
sure relief valve or unloader is operating properly.
Adjust relief valve to desired pressure. See regulator
instructions. Cycle nozzles, or gun, on and off to be
sure that pressure adjustment and regulator operation
is satisfactory.
LUBRICATION AND SERVICE
face of pump and turning crankshaft over 4 or 5 times,
or the fluid end can be removed to completely drain
cylinders and fluid end.
SERVICE
Disconnect electrical leads to motor, or remove spark
plug leads on engine.
PLUNGER SEAL SERVICE CXP SERIES
Removal: Remove eight nuts holding fluid end to
power end and pull straight forward. Use care with
ceramic plunger pumps. Unscrew plunger from top
opening and pull plunger out. Use screwdriver to pry
the seal housing out. May take use of the crosshead
to push seal housing out by inserting a block between
crosshead and seal housing.
When replacing the plunger seal, clean all plungers,
replace and lubricate O-rings. Ceramic plungers
should be cleaned by soaking in muriatic acid to
remove all build-up of packing material. Caution!
Avoid direct contact with muriatic acid. Wear
protective gloves and eye protection. If exposed,
flush exposed area with water. Consult a physician
for treatment of muriatic acid burns. Clean bore
and lubricate O-rings and plunger seal with a quality
waterproof grease before replacing seal housing
and plunger. The plunger should be inserted into
crosshead. Hand turn all the way until it stops. Use
wrench to finish. Torque to 45 ft/lbs. When the seal
housing is seated properly, the plunger fastened to the
crosshead and with all internal parts in place in fluid
end, the fluid end can be replaced. Be sure to install
flange gasket between fluid end and power end when
reassembling.
LUBRICATION
Pump- Crankcase must be filled with 2 to 2-1/2 pints
of S.A.E. 30 oil unless ambient temperature exceeds
90°F, when S.A.E. 40 should be used. Use only quality
oils with API designation MS, SC, or SD; maintain level
at mark on dipstick. Foaming and yellow discoloration
of oil is an indication of water; oil should be changed
immediately to preclude possible damage to power
and components.
NOTE - Drain oil from crankcase after first 30 hours
of operation. It is best to always drain the oil when
it is still hot. Refill with new oil as mentioned above.
Run pump at full speed under no pressure for 2 or
3 minutes before returning to operation. Therefore
change oil every 300 hours or immediately if water
droplets are found on dipstick. Check oil level regularly
and add oil as needed.
Avoid freezing by draining all water from pump and
system in cold weather. This can be done by breaking
suction connections, removing pipe plug from front
Insert all nuts and lock washers in place and pull fluid
end down tight. Do not cock fluid end while tightening,
pull down evenly by alternately tightening to final
torque 25-30 ft/lbs.
CYLINDER & PACKING SERVICECX1020
SERIES
Removal: Remove eight cap screws holding fluid end
to power end, and pull straight forward. Use care with
ceramic liner pumps. Do not cock water end or drop
liner. Valve seat valve spacer and spring should remain
in fluid end. Loosen stem and piston assembly can
be removed with a socket wrench through cylinder
opening. If cylinders have corroded in place, they may
be removed. Grease the O.D. when replacing.
When replacing packing, clean all piston parts, replace
and lubricate O-rings. Ceramic cylinders should be
cleaned by soaking in muriatic acid to remove all
build-up of packing material. Caution! Avoid direct
contact with muriatic acid. Wear protective gloves
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23833A134 06/30/17
and eye protection. If exposed, flush exposed area
with water. Consult a physician for treatment of
muriatic acid burns. Clean bore and lubricate O-rings
and cylinder with a quality waterproof grease before
replacing cylinder and piston assembly. The piston
assembly should be inserted into the opening. Care
should be used to assure proper seating of the
cylinder into the machined opening at the rear of the
bore. When the cylinder is seated properly, and the
piston assembly adjusted and locked in place, with all
internal parts in place in fluid end, the fluid end can be
replaced. Care should be taken in reassembly so that
the large end of suction spring seats against cylinder
and not between the cylinder and spacer. Be sure to
install a nylon gasket between the cylinder and spacer
when reassembling.
VALVE SERVICECXP SERIES
Remove the stainless steel shoulder screw which
serves as a valve guide and spring retainer. The
shoulder screw can be removed with a socket. Remove
shoulder screw, spring retainer, spring and valve from
the pump fluid end.
Assemble stud, retainer and three screws and insert
screw heads through holes in valve seat. Rotate
retainer to the right until heads catch and secure in
place by screwing down stud firmly by hand. Place
plate over stud and screw on nut. Torque slowly with
wrench until seat breaks loose.
pushed toward the water end as far as possible.
Before removal, be sure to note the markings on
the connecting links and caps. These parts are not
interchangeable and must be reassembled in their
original positions. The crankshaft bearings and
bearing cap can now be removed by tapping with a
hammer against a block of wood on one end of the
crankshaft. The crankshaft should be supported so
that as the bearings leave the bores the crank does not
drop and damage a crank pin. Do not remove bearing
from crankshaft unless replacement is necessary.
After removing crankshaft, the links and crosshead
can be pulled out the crankcase opening.
SERVICING CONNECTING LINKS
The connecting rod link is furnished with replaceable
split sleeve bearing inserts at the crank throw and a
steel backed bushing at the crosshead end. When new
replacement links are obtained, these bushings are
reamed to the proper size for immediate installation.
If the bushing only is removed from an old link, it may
be necessary to ream the replaced bushing to the
proper inside diameter after it is pressed into the link.
When placing the bushing in the link be sure that the
oil holes in the bushing and link will be in line after the
bushing is pressed into position.
The connecting links should be checked for bearing
wear only if the pump shows signs, which might be due
to a failing link, or during a general overhaul.
Both valve seats are identical and can be serviced
the same way. Valve seats are usually distorted and
cannot be reused unless the face is reground to flat
conditions.
VALVE SERVICECX1020 SERIES
To remove discharge valve or spring, remove water end
and pull valve seat with a 3/4-16 UNF threaded rod or
cap screw.
Suction valves will show a wear pattern on seating side
but need not be replaced unless cranked or erosion
is present on seating face. To replace valve seat, first
clean both bores with sandpaper or emery cloth to
remove all corrosion. Replace discharge valve and
spring. O-rings on valve seat should be replaced and
lubricated. Insert valve seat into bore, if resistance is
met as O-rings enter bores, place a flat piece of wood
on seat and tap into place with hammer.
SERVICING CRANKCASE PARTS
To remove the crankshaft, the plungers or pistons and
fluid end or cylinders must first be removed. Drain
oil from crankcase and remove rear cover. Remove
retainer ring from bearing bore. The connecting
link caps should be taken off and the free links
Unnecessary inspections may upset smooth operation
and ultimately cause failure. If it becomes necessary to
replace a link or crosshead, this can be done by driving
out the link pin. When replacing the pin an arbor press
should be used and care should be taken so that the
link is not bent. As the pin is pressed in, occasionally
the two sides of the crosshead will give enough to grip
the link so that it will not operate freely. If this occurs,
rotate the link and crosshead 180 degrees and tap the
pin sharply in the opposite direction.
Always be sure that the proper side of the link is
placed upward when attaching it to the crankshaft. The
upper side contains three oil holes. These oil holes
must be up to allow proper oil feeding.
It is never practical to attempt to re-fit connecting links
to the crankshaft by filing or grinding the face of the
link cap where it contacts the link. Torque for link bolts
not to exceed 65-75 inch/lbs or 6 ft/lbs. Under normal
conditions a crosshead will not wear, nor will the
bore of the crankcase wear to the extent that oversize
crossheads will be required. If extreme wear does
occur, it will be due to severe damage from the lack of
oil or a fairly large metal object scoring the crosshead
bore. A clearance of .002" to .004" is standard for the
crosshead. The parts can wear until considerably more
clearance than this exists before harmful operation
will occur.
23833A134 06/30/17
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