Page 1
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
Page 2
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.
2
Page 3
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
3
23833A134 06/30/17
Page 4
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
4
Page 5
RECONDITIONING CRANKSHAFTS
When crank pins are slightly damaged, they can
sometimes be reconditioned for further use. This can
be done with emery cloth and polishing until all ridges
are completely removed. The final polishing operation
should be performed by using a very fine emery cloth.
This procedure can only be followed where the amount
of sanding does not reduce the normal diameter of the
crank pin.
Worn or corroded crank pins can be ground and
polished down to .030” under the size when the cranks
were new. The undersize connecting links are made
especially for turned down crankshafts.
If the surface is badly damaged, the crankshaft can
often be salvaged by “metallizing” the crank pins,
regrinding and polishing to the original diameter.
REPLACING CROSSHEAD SEALS
With the crankshaft and crossheads removed, the
worn seals can be pried out. When installing new seals
be sure to place them with the lip facing the power
end and the metal face toward the water end. After
cleaning the cavity and wiping with oil, the seal can be
pressed into place with an arbor press or by tapping
lightly with a hammer against a block of wood. When
returning crossheads through new seals care should
be taken not to turn back or damage the lip of the
seal. An assembly thimble can be very helpful in this
operation.
After replacing the crossheads and links, they should
be pushed all the way forward; then the crankshaft
can be replaced just as it was removed. All link caps
should be tightened in place and free operation of
the crank assured before replacing bearing cap
and retainer ring. When replacing bearing cap, an
assembly thimble is helpful. The thimble should be
machined from high carbon steel and polished on the
exterior to reduce possibility of seal lip damage. Clean
and lubricate all seals and O-rings before replacing.
5
23833A134 06/30/17
Page 6
CXP Series Industrial Pumps Parts
41
32
29
31
30
26
28
50
40
42
27
25
47
4846
38
49
34
35
36
37
44
43
33
45
39
1
18
20
24
19
17
4
15
16
2
3
5
6
7
14
8
11
13
21 13
23
12
22
9
10
9
10
12
23833A134 06/30/17
6
Page 7
CXP Series Industrial Pumps Parts List
Power End Parts (All 7 Models)
Item Description Qty. Eng. No.
1 Cover 1 19324A000
2 Oil Gauge 1 20360A000
3 O-Ring 1 05876A074
4 Crankcase (Shaft Drive) 1 19313E001
Crankcase (Hyd. Drive) 1 19313E014
5 Gasket 1 19314B000
6 Cover 1 19315B000
7 Screw 8 19100A001
8 Crankshaft (Shaft Drive) 1 18451C002K
Crankshaft (Hyd. Drive) 1 18451C003
9 Roller Bearing 2 06114A003
10 Oil Seal (Shaft Drive) 2 14383A004K
Oil Seal (Hyd. Drive) 1 14383A004K
11 Retaining Ring (Shaft Drive) 1 10848A016
Fluid End Parts
Item Description Qty. Eng. No. Model
25 Body, Fluid End Ductile 1 24889E000 ALL MODELS
26 Valve, Acetal 6 18834A000 ALL MODELS
27 Seat, Valve 6 18835A000 CXP30-12
6 18835A005
6 18835A006 CXP7-30
28 Screw Cap 6 18832A000 ALL MODELS
29 Retainer, Spring 6 18833A001 ALL MODELS
30 Spring, Valve 6 11829A000 ALL MODELS
31 Spring, Valve 3 18462A000 ALL MODELS
32 Cap, Valve Iron 6 24893A001 ALL MODELS
33 Plate, Seal 3 24895B000 CXP30-12
3 24895B001 CXP26-14
3 24895B002 CXP22-16
3 24895B003 CXP18-20
3 24895B004 CXP14-24
3 24895B005 CXP7-30
3 24895B006 CXP5-35
34 Washer, Seal 3 24894A000 CXP30-12
3 24894A001 CXP26-14
3 24894A002 CXP22-16
3 24894A003 CXP18-20
3 24894A004 CXP14-24
3 24894A005 CXP7-30
3 24894A006 CXP5-35
35 Seal, High Pressure 6 24897A001 CXP30-12 (Use for
3 24899A011 CXP26-14
6 27287A001 CXP22-16
6 27287A002 CXP18-20
6 27287A003 CXP14-24
6 27287A004 CXP7-30
6 27287A005 CXP5-35
CXP26-14
CXP22-16
CXP18-20
CXP14-24
CXP5-35
EXCEPT CXP7-30,
CXP5-35
both high and low
pressure seal)
Item Description Qty. Eng. No.
12 O-Ring 1 05876A035
13 Bearing Cap (Shaft Drive) 1 18452A000
Hydraulic Adapter 1 26368B000
14 Pipe Plug 1 05022A009
15 Link 3 18836B000
16 Bearing Pair 3 18837A100K
17 Wrist Pin 3 18448A000
18 Crosshead 3 18449B001
19 Oil Seal 3 14383A003K
20 Washer, Splash 3 05030A198
21 Key (Shaft Drive) 1 05818A003
22 Oil Seal (Hyd. Drive) 1 05710A045
23 Screw (Hyd. Drive) 8 06106A047
24 Wrist Pin Bushing 3 27877A000K
Item Description Qty. Eng. No.
36 Male Adapter 3 27286A000 CXP22-16
37 Female Adapter 3 24794A000 CXP22-16
O-Ring
38
39 Plunger, Tungsten Carbide 3 24896B010 CXP30-12 (1
Plunger, Ceramic” 3 24896B001 CXP26-14 (1
40 O-Ring 6 05876A030 All Models
41 Ring, Back-Up 3 24898A001 CXP30-12
42 O-Ring 3 05876A158 All Models
43 Gasket, Flange 1 24792B000 All Models
44 O-Ring 3 05876A092 All Models
45 Seal, Low Pressure 3 24899A002 CXP26-14
Fitting Straight 1 10519A002 All Models
Fitting 90° 1 23188A001 All Models
Tube 1 10649A128 All Models
46 Studs 8 05659A116 All Models
47 Plug, Pipe 1-1/2" for Fitting 1 05022A076 All Models
48 Nut, Hex 8 19109A026 All Models
49 Washer, Lock 8 05454A005 All Models
50 Plug, Pipe 1-1/2" 1 05022A016 All Models
Plug, Pipe 1 1 05022A043 All Models
3 27286A001 CXP18-20
3 27286A002 CXP14-24
3 27286A003 CXP7-30
3 27286A004 CXP5-35
3 24794A001 CXP18-20
3 24794A002 CXP14-24
3 24794A003 CXP7-30
3 24794A004 CXP5-35
3 05876A160
3 05876A159 CXP18-20
3 05876A161 CXP14-24
3 05876A162 CXP7-30
3 05876A163 CXP5-35
3 24896B002 CXP22-16 (1
3 24896B003 CXP18-20 (1
3 24896B004 CXP14-24 (1
3 24896B005 CXP7-30 (1)
3 24896B006 CXP5-35 (
3 24898A002 CXP26-14
6 18753A004 All Models
3 24899A003 CXP22-16
3 24899A004 CXP18-20
3 24899A005 CXP14-24
3 24899A006 CXP7-30
3 24899A007 CXP5-35
Model
CXP22-16
5
/8)
1
/2)
3
/8)
1
/4)
1
/8)
7
/8)
7
23833A134 06/30/17
Page 8
CX10-15 & CX20-10
CX10-15 AVAB & CX20-10 AVAB
Industrial Pumps Parts List
Catalog Number of Industrial Pumps
Item Description Qty. Eng. No. Eng. No.
1 Body, Liquid End, w/Spring Guide
Ductile Iron
Cast Aluminum Bronze (AB)
2 Spring Guide 3 20488A000 20488A000
3 Spring, Discharge 3 18318A000 18318A000
4 Valve, Discharge 3 18317A000K 18317A000K
Valve, Discharge, 316 SST 3 18317A001K 18317A001K
5 Valve Seat 3 19320A000K 19320A000K
Valve Seat, 316 SST 3 19320A002 19320A002
6 O-Ring, 15/16" I.D., 1-1/8" O.D., 3/32" Dia. 3 05876A203 05876A203
7 O-Ring, 2-1/8" I.D., 2-5/16" O.D., 3/32" Dia. 6 05876A092 05876A092
8 Valve, Suction 3 19321A000 19321A000
9 Spring, Suction 3 19322A000 19322A000
10 Spacer, Cylinder Liner to Seat 3 19323A000 19323A000
11 Gasket, Nylon, 2" I.D., 2-19/64" 0.D., .040"
Dia., Spacer to Ceramic Liner
12 Cap Screw, Plunger to Plunger Stem 3 17050A001 17050A001
13 Washer, Cap Screw to Packing 3 05030A146 05030A147
Washer, Cap Screw to Packing, 316 SST 3 05030A204 O503OA205
14 Spring, Spacer, Plunger 3 19605A000 19606A000
15 Washer, Packing, Plunger 3 05030A141 05030A145
Washer, Packing, Plunger, 316 SST 3 05030A202 05030A203
16 “V” Packing, for Plunger 3 18922A001K 18922A002K
17 Follower, Plunger 3 19327A000 19328A000
18 Washer, Plunger, Stainless Steel 3 05030A142 05030A143
Washer, Plunger, 316 SST 3 05030A200 05030A201
19 Stem, Plunger 3 19325A000 19326A000
Stem, Plunger, 316 SST 3 19325A010 19326A010
20 Cylinder Liner, Ceramic 3 19346A000K 19346A001K
Washer, Splash, .575” I.D., 1-13/16” O.D.,
21
.064” Thick
(w/ceramic liners)
CX10-15 CX20-10
1119319D012K
19319D007K
3 05059A398 05059A398
3 05030A141 05030A141
19319D012K
19319D007K
Catalog Number of Industrial Pumps
Item Description Qty. Eng. No. Eng. No.
22 Crosshead
Washer, Splash, Nylon 1-5/8" I.D., 2-1/4"
O.D., .040" Thick
23 Oil Seal, Crosshead to Crankcase 3 14383A003K 14383A003K
24 Pin, Link to Crosshead 3 18448A000 18448A000
25 Link Complete
Bushing
Washer
25A Bearing Halves, pair 3 18837A100K 18837A100K
26 Cap Screw for Link 6 06106A016 06106A016
27 O-Ring, 3" I.D., 3-1/4" O.D., 1/8" Dia. for
Bearing Cap
28 Bearing, Ball, Crankshaft 2 08565A011K –
Bearing, Roller, Crankshaft 2 – 06114A003
29 Oil Seal, Crankshaft to Crankcase 2 14383A004K 14383A004K
30 Crankshaft 1 18451C002K 18451C002K
31 Retaining Ring, Bearing Cap to Crankcase 1 10848A016 10848A016
32 Cap, Bearing, for Crankshaft 1 18452A000 18452A000
33 Gasket, Rear Cover to Crankcase 1 19314B000 19314B000
34 Cover, Rear, Crankcase 1 19315B000 19315B000
35 Cap, Screw, Rear Cover to Crankcase 8 19100A001 19100A001
36 Oil Gauge with O-Ring 05876A074 1 20360A010K 20360A010K
37 Crankcase and Cylinder Body 1 19313E001 19313E001
38
Cap Screw, Liquid Body to Cylinder Body
Lockwasher, 7/16"
(for cap screw ref nos. 38 & 39)
39
Cap Screw, Liquid Body to Cylinder Body
Plug, Drain, 1/4" NPT
Plug, Pipe, 1/4" NPT
Plug, Pipe, 1-1/4" NPT
40 Plunger Cover 1 19324A000 19324A000
(w/ceramic liners)
CX10-15 CX20-10
3318449B001
O503OA198
3
18836B000
3
27877A000K
6
05030A092
1 05876A035 05876A035
4819102A014
05454A005
4
19102A015
1
05022A009
2
05022A092
2
05022A041
18449B001
O503OA198
18836B000
27877A000K
05030A092
19102A014
05454A005
19102A015
05022A009
05022A092
05022A041
23833A134 06/30/17
8
Page 9
THE PUMP MUST BE INSTALLED WITH A PRESSURE RELIEF VALVE IN DISCHARGE LINE
TROUBLESHOOTING
Pump fails to build pressure with discharge closed
Failure to hold pressure with discharge open
Pump is noisy
Pump gets hot
Pressure gauge shows abnormal fluctuation
Regulator chatter
POSSIBLE CAUSE OF PROBLEM
1. Pump not primed X
2. Valve closed in suction line X X
3. Suction line or sediment chamber clogged X X X
4. Air leak in suction line X X X
5. Pressure regulator valve badly worn or not properly adjusted X X
6. Pump plunger cups or valves badly worn X X X
7. Pump cylinder body cracked X X X
8. Holes in discs are too large X
9. Need suction surge arrester X
10. Water in crankcase X
11. Worn connecting link bearings X X
12. Lack of oil in crankcase X X
13. Foaming mixture X X X
14. Regulator plunger sticking X
15. Unloader stuffing box nut too tight X
16. Foreign matter under pump valve X X X
17. Discharge surge arrester inoperative X X
18. Loose plunger rod X
19. Improper preload of crankshaft bearings X X
Explanation of the Service Chart
1. Pump priming is usually not necessary when the
pump is installed correctly. However, there are certain
conditions which may make it necessary to prime the
pump to get the pumping action started. Priming will
be required when it is impossible for the plunger to
displace the air in the pump and replace it with water.
This can be caused by a high suction lift, the valves
being stuck on the seat or by valves sticking due to
extreme corrosion. A pump will not prime readily if
someone has tampered with the valve springs causing
them to exert undue pressure of the valve plates
against the valve seats.
2. A gate valve is sometimes installed in the suction
line between a tank or pressure line and the pump
sediment chamber. It will shut off the supply source
in order to clean the sediment chamber or to
perform pump repairs. If this valve is partially or fully
closed, it will interfere with the flow of water to the
pump suction. This may cause severe knocking and
vibration of the pump because the water cannot flow
into the cylinder cavities fast enough.
3. A sediment chamber should be installed in the suction
line between the gate valve and the pump suction. The
strainers in the sediment chambers are sufficient to
allow a free flow of liquid to the pump. If the strainers
become severely clogged, they will completely stop
the flow of liquid to the pump.
4. Any plunger pump operating at a high pressure will
not perform properly nor quietly if a mixture of air and
water is allowed to enter the pump suction. A small
air leak in the suction line will cause the pump to
knock and vibrate excessively by allowing the pump to
draw a certain amount of water mixed with air on each
stroke of the plunger. A large air leak will cause the
pump to lose prime after which it cannot be reprimed
until the air leak is stopped. Air leaks may occur at
the joints of the suction line piping, at the gate valve in
the suction line, at the gasket sealing the cap on the
sediment chamber, by a crack in the suction wall of
the cylinder body or by air drawing past the plunger
cups on the suction stroke if the plunger cups are
badly worn.
9
23833A134 06/30/17
Page 10
5. If the pressure regulator unloading valve is worn, it
will allow too much of the pump capacity to be
bypassed and recirculated back to the tank. By
examining the flow from this valve with the discharge
turned on, it can be determined whether or not the
valve is worn. If a heavy flow continues when the
discharge is turned on, it is usually a good indication
of a worn valve and should be replaced.
6. Worn plunger cups, valves or valve seats will cause a
severe drop in pump capacity pressure. Worn plunger
cups are detected by water leakage past the cups
and immediately should be replaced. Water getting
into the pump crankcase will cause severe corrosion
of the bearings. Worn valves can only be detected by
visual examination of each valve assembly. Abrasive
liquid will cause wire cuts which begin as a very small
groove, but increase rapidly once the valve starts
to leak through this groove. If the valve plates are
replaced as soon as they start to show this cutting
action, it will prevent the valve seat from becoming
cut in a similar manner.
7. Pump cylinder bodies withstand an extreme amount
of shock and pulsation while in operation, but if the
pump is allowed to freeze, by not being drained, the
freezing may crack the cylinder body walls in almost
any location. If the crack occurs on the suction valve
or cylinder portion of the body, it may allow a small
amount of air to enter on the suction stroke and cause
noisy operation or a decrease in pumping capacity. If
the crack develops in the walls between the cylinder
cavities or discharge valve cavity, it may allow the
water to flow from one cavity to the adjacent cavity
and cause uneven displacement.
8. The holes in the gun or nozzle discs are continually
subject to wear because of the high velocity of the
liquid through the holes. If the holes become worn,
they may allow a higher rate of discharge than the
pump is able to provide, then a drop in pressure will
be noticed. This can quickly be checked by reducing
the number of nozzles or guns while watching the
amount of overflow from the pressure regulator. If
there is considerable overflow, it is an indication that
the regulator valve is worn rather than the gun or
nozzle disc.
9. Suction surge arresters should be installed on the
suction line of reciprocating pumps, 1-1/2" or 2"
can be used. A standing height of 12"-15" will be
sufficient with the top end closed by an ordinary pipe
cap.
10. Water may accumulate in the pump crankcase from
two sources; leakage of the plunger cups or an
accumulation of condensation/moisture inside the
crankcase due to changes in weather or the repeated
heating and cooling of the pump. Pumps used
consistently, running for a considerable period of
time to heat the oil and other working parts, will not
normally accumulate water by condensation. Replace
the plunger cups as soon as they start to leak.
11. Worn connecting link bearings are caused by unusual
or adverse operating conditions and are seriously
affected by corrosion if water is present in the
crankcase. They will wear out from overheating if
adequate oil is not provided in the crankcase. It is
recommended to drain, clean and refill with new oil
prior to any storage period. Replace bearings as soon
as any damage is discovered to avoid possible damage
to crankshaft.
12. Low oil in the crankcase can quickly cause failure
of the pump's power end and result in extensive
repairs. Oil level should be checked periodically
during normal operation and during all
maintenance work.
13. A foaming mixture will sometimes have the same
effect as a small air leak in the suction line. This is
because various quantities of the foam are drawn
through the suction line into the pump disrupting the
normal flow of water.
14. Pressure regulators and unloading valves may
become sluggish in action due to the plunger sticking
or fitting too tightly in its cylinder. This may happen
by an accumulation of chemicals collecting in and
around the plunger or due to excessive corrosion of
the plunger parts. To check this condition, remove
and clean the plunger and cover the parts with a
waterproof grease before assembling.
15. The stuffing box nut on the unloading valve lifting
post should not be tightened to severely grip or
bind the packing on the post. Tighten this nut just
enough to prevent leakage and chatter. The pressure
regulator and unloading valves may chatter or
vibrate excessively due to an unstable operation
from nozzling in the high or low capacity range of the
regulator or unloader. The range should be at least
50% to 90% of pump capacity. With unloader valves,
nozzle capacity should be at least 20% and not exceed
90% of pump capacity.
16. If foreign matter becomes lodged between the pump
valve and valve seat, a drastic drop in capacity and
considerable surge or pulsation will occur in the
discharge line. Examine each valve if this occurs.
17. When a pump is used for a long period of time, a
waterlogged discharge surge could cause pulsation
at the discharge. The suction should be opened into
the atmosphere to allow air to be drawn through the
pump to recharge the surge arrester. Do this with the
pressure release valve open so the pump operates at
no pressure.
23833A134 06/30/17
10
Page 11
18. Noisy pump operation can be caused by a loose
plunger rod in the crosshead. This noise usually
has a regular cadence timed with each stroke of the
plunger. When this occurs, always replace both the
rod and the crosshead.
19. Increased preload to the crankshaft bearings will
reduce bearing life, require more power and generate
more heat, while insufficient preload may cause a
knock, timed with the crankshaft rotation. Check
for loose bolts on the crankshaft end caps or adjust
shims to obtain proper bearing preload.
11
23833A134 06/30/17
Page 12
STANDARD LIMITED WARRANTY
CENTRIFUGAL & RECIPROCATING PUMPS
Pentair Myers® warrants its products against defects in material and workmanship for a period of 12 months from
the date of shipment from Pentair Myers or 18 months from the manufacturing date, whichever occurs first – provided
that such products are used in compliance with the requirements of the Pentair Myers catalog and technical manuals.
During the warranty period and subject to the conditions set forth, Pentair Myers, at its discretion, will repair or
replace to the original user, the parts that prove defective in materials and workmanship. Pentair Myers reserves the
right to change or improve its products or any portions thereof without being obligated to provide such a change or
improvement for prior sold and/or shipped units.
Seals, piston cups, packing, plungers, liners and valves used for handling clear, fresh, nonaerated water at a
temperature not exceeding 120ºF are warranted for ninety days from date of shipment. All other applications are
subject to a thirty day warranty. Accessories such as motors, engines and auxiliary equipment are warranted by
the respective manufacturer and are excluded in this standard warranty. Under no circumstance will Pentair Myers
be responsible for the cost of field labor, travel expenses, rented equipment, removal/reinstallation costs or freight
expenses to and from the factory or an authorized Pentair Myers service facility.
This limited warranty will not apply: (a) to defects or malfunctions resulting from failure to properly install, operate
or maintain the unit in accordance with the printed instructions provided; (b) to failures resulting from abuse, accident
or negligence; (c) to normal maintenance services and parts used in connection with such service; (d) to units that
are not installed in accordance with applicable local codes, ordinances and good trade practices; (e) if the unit is
moved from its original installation location; (f) if unit is used for purposes other than for what it is designed and
manufactured; (g) to any unit that has been repaired or altered by anyone other than Pentair Myers or an authorized
Pentair Myers service provider; (h) to any unit that has been repaired using non factory specified/OEM parts.
Warranty Exclusions: PENTAIR MYERS MAKES NO EXPRESS OR IMPLIED WARRANTIES THAT EXTEND BEYOND THE
DESCRIPTION ON THE FACE HEREOF. PENTAIR MYERS SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR PURPOSE.
Liability Limitation: IN NO EVENT SHALL PENTAIR MYERS BE LIABLE OR RESPONSIBLE FOR CONSEQUENTIAL,
INCIDENTAL OR SPECIAL DAMAGES RESULTING FROM OR RELATED IN ANY MANNER TO ANY PENTAIR MYERS
PRODUCT OR PARTS THEREOF. PERSONAL INJURY AND/OR PROPERTY DAMAGE MAY RESULT FROM IMPROPER
INSTALLATION. PENTAIR MYERS DISCLAIMS ALL LIABILITY, INCLUDING LIABILITY UNDER THIS WARRANTY, FOR
IMPROPER INSTALLATION. PENTAIR MYERS RECOMMENDS INSTALLATION BY PROFESSIONALS.
Some states do not permit some or all of the above warranty limitations or the exclusion or limitation of incidental or
consequential damages and therefore such limitations may not apply to you. No warranties or representations at any
time made by any representatives of Pentair Myers shall vary or expand the provision hereof.
1101 MYERS PARKWAY
ASHLAND, OHIO, USA 44805
855-274-8948
WWW.FEMYERS.COM
Warranty Rev. 12/13
Loading...