fti AIR FT025P User manual

1
FTI AIR AODD MODELS FT025P, FT025V, & FT025C
Assembly, Installation, & Operation Manual
Record your Model and Serial Number here.
MODEL NUMBER
SERIAL NUMBER
P/N 109814 REV 3

2
EU Declaration of Conformity
FTI Air hereby declares that the following machine(s) fully comply with the applicable health and
safety requirements as specified by the EC Directives listed. The complete product complies with
the provisions of the EC Directive on machinery safety.
This declaration is valid provided that the devices are fully assembled and no modifications are
made to these devices.
Type of Device:
Air Operated Double Diaphragm Pumps
Models:
FT025P, FT025V, FT025C, FT05P, FT05V, FT05A, FT05S,
FT10P, FT10V, FT10A, FT10S, FT15P, FT15V, FT15A, FT15S, FT15ZP, FT15ZV, FT15ZA, FT15ZS,
FT20P, FT20V, FT20A, FT20S, FT30A & FT30S
EC Directives:
Machinery Safety (2006/42/EC)
Applied Harmonized Standards:
EN ISO 12100
Manufacturer:
FTI Air A Division of Finish Thompson, Inc.
921 Greengarden Road
Erie, Pennsylvania 16501-1591 U.S.A
Signed,
President
23 May 2019
Person(s) Authorized to Compile Technical File: FTI Air GmbH
Otto-Hahn-Strasse 16
Maintal, D-63477 DEU
Telephone: [phone]

3
EU Declaration of Conformity
Manufactured by:
Finish Thompson, Inc.
921 Greengarden Road
Erie, Pennsylvania 16501 U.S.A.
Phone: [phone]
Fax [phone]
Email: [e-mail] II 2 GD c IIB TX
Web: www.finishthompson.com FTZU 16 ATEX A 473 -16
This declaration applies to FTI Air ATEX Series AODD pumps, being designated by the letter -A- in the model
number, and only manufactured out of metallic or carbon fiber filled PP designated by the model numbers FTXX[Z]A,
FTXX[Z]S, or FTXX[Z]C, with metallic or carbon fiber filled non-wetted parts designated by the letters -AA- or -CD-
within the model number. Pumps and their model numbers may also contain differentcombinations of diaphragms,
balls, seats, o-rings, port connections, and other options.
Example Model Numbers: FT05C-CD-2TPC-B1-A, FT05A-AA-NNAN-B1-A, FT15ZA-AA-BBAB-B2-A
Finish Thompson declares under our sole responsibility thatthe product listed below conforms tothe relevant
provisions of EU directive 2014/34/EU of 26 February 2014 for equipment and protective systems intended for use in
potentially explosive atmospheres, and is certified for safe use in Group II category 2 areas.
This product has used the following harmonized standards to verify conformance:
Non-electrical equipment for potentially explosive atmospheres: EN ISO 80079-36:2016
Basic Methods and Requirements .
Non-electrical equipment intended for use in potentially explosive atmospheres: EN ISO 80079 - 37:2016
Protection by construction safety “ch” and control of ignition source “bh”.
This product must not be used in areas other than specified above. Ifin doubt consult an authorized
distributor, or refer to the manufacturer Finish Thompson.
Approved by:
Date: 12/03/2020
II 2GD
Ex h IIC T6 Gb
Ex h IIIC T6 Db
FTZU 16 ATEX A473-16
1026

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Table of Contents
Important Information - READ ME FIRST
Export Regulation Notice .......................................................................................................................... 5
Chemical Reaction Disclaimer ................................................................................................................ 5
Safety Precautions .................................................................................................................................. 5-6
Pump Specications
Materials Proles........................................................................................................................................... 7
TechnicalSpecications ................................................................................................................................ 7
ModelNumberExplanation & Example Part Numbers........................................................................... 8
Performance Curve...................................................................................................................................... 8
Dimensional Drawing................................................................................................................................. 9
Installation/Operation
Installation Drawing.................................................................................................................................. 10
Precautions................................................................................................................................................. .. 10
Troubleshooting......................................................................................................................................... 11
Maintenance
Recommended Tools ................................................................................................................................ 11
Wet End Servicing ..................................................................................................................................... 11
Disassembly ................................................................................................................................ .. 12-13
Reassembly .................................................................................................................................. 14-17
Air End Servicing ....................................................................................................................................... 17
Shaft & Bushing Replacement................................................................................................ 17-18
Air Valve O-ring Replacement....................................................................................................... 18
Valve Gasket Replacement........................................................................................................... .. 19
Replacement Air Valve Kit Installation........................................................................................ 19
Exploded View ........................................................................................................................................... 20
Spare Parts List................................................................................................................................... .. 20-23
Warranty .............................................................................................................................................................. 24

5
Important Information- Read Me rst
IMPORTANT NOTICE
U.S. Export Administration Regulations, pursuant to ECCN 2B350, prohibit the export or re-export to certain
enumerated
countries of air operated double diaphragm pumps in which all wetted materials are constructed from uoropolymers
without rst applying for and obtaining a license from the U.S. Bureau of Industry and Security(BIS). This aects all FTI
AIR pumps constructed from PVDF with PTFE balls and diaphragms. Please contact the BIS (www.bis.doc.gov) or FTI
Air with questions regarding the Regulations or a list of the countries to which they apply.
Chemical Reaction Disclaimer
The user must exercise primary responsibility in selecting the product’s materials of construction which are
compatible with the uid(s) that come(s) in contact with the product. The user may consult FTI Air (manufacturer) and
a manufacturer’s representative/distributor agent to seek a recommendation of the product’s material of construction
that oers the optimum available chemical compatibility.
However neither manufacturer nor agent shall be liable for product damage or failure, injuries, or any other damage
or loss arising out of a reaction, interaction or any chemical eect that occurs between the materials of the product’s
construction and uids that come into contact with the product’s components.
Unpacking & Inspection
Unpack the pump and examine for any signs of shipping damage. If damage is detected, save the packaging and
notify the carrier immediately.
To install the pump, follow the installation instructions provided.
Safety Precautions for ATEX Pumps
WARNING: READ THIS SUPPLEMENTAL INSERT COMPLETELY BEFORE INSTALLING AND OPERATING THIS
PUMP. FAILURE TO FOLLOW THESE PRECAUTIONS CAN RESULT IN SERIOUS INJURY OR DEATH.
WARNING: Static sparking can cause explosion. When operating in a hazardous area or pumping
a hazardous uid, the pump’s grounding screw and entire pump system must be grounded to earth to
prevent static discharge. This includes but is not limited to pipes, hoses, tanks, containers, valves, etc.
Before operating the pump, ensure the electrical continuity throughout the pumping system and earth
ground is 1 Ohm or less. If it is greater than 1 Ohm, re- check all grounding connections.
WARNING: Static sparking can cause explosion. Excessive uid ow rates and improper tank lling
methods can produce static electricity causing an explosion. Ensure safe uid velocities and tank lling
procedures in compliance with EN 13463-1 and CLC/TR 50404.
WARNING: Vibrations from operation may cause mounting surfaces and connections to loosen and
generate a spark. Ensure the pump and connections are securely mounted and fastened prior to each
operation.
WARNING: Do not exceed minimum and maximum temperature limits of pump components. A table of
temperature limits is provided in the “Material Proles” section of the manual.
WARNING: Prior to operating, check pump for any worn o-rings, gaskets, or seals. Any leaking or
damaged o-rings, gaskets, or seals must be repaired or replaced immediately.
WARNING: Do not exceed maximum pressure stated on the pump serial number sticker.
WARNING: Pump exhaust may be loud and contain particles. Wear appropriate ear and eye protection.
In the event of a diaphragm rupture material can be forced out of the air exhaust muer.
WARNING: Pump must be cleaned on a regular basis to avoid dust buildup greater than 5mm.

6
CAUTION: If pump is used with materials that tend to solidify or settle, the pump should be ushed after each use
to prevent damage.
CAUTION: Use only genuine FTI Air replacement parts to assure compatibility & longest service life.
CAUTION: Check the temperature limits for all wetted components when choosing pump materials. See table on
page 7.
EXPLOSION HAZARD!: FTI Air pumps with standard materials of construction should not be used with halogenated
hydrocarbons. Halogenated hydrocarbon solvents can cause explosion when used with aluminum components and
will be aected by halogenated hydrocarbon solvents.
1-1-1 Trichloroethane and Methylene Chloride are the most commen halogenated hydrocarbons. However, oth-
er halogenated hydrocarbon solvents are suspect if used either as part of paint or adhesive formulation, or for
clean-up ushing.
For applications that may involve halogenated hydrocarbons, contact FTI Air to discuss the availability of alternative
pump materials of construction.
WARNING: FTI Air maximum temperature limits are based upon the material’s mechanical stress only. Maximum
temperature is application dependent. Consult a chemical resistance guide or the chemical manufacturer for chemical
compatibility and temperature limits.
WARNING: Chemical Hazard. This pump is used for transferring many types of potentially dangerous chemicals.
Always wear protective clothing, eye protection and follow standard safety procedures when handling corrosive or
personally harmful materials. Proper procedures should be followed for draining and decontaminating the pump before
disassembly and inspection of the pump. There may be small quantities of chemicals present during inspection.
WARNING: Hot surfaces. FTI Air pumps are capable of handling liquids with temperatures as high as 220ºF (104ºC).
This may cause the outer areas of the pump to become hot as well and could cause burns.
WARNING: If a diaphragm rupture occurs, material being pumped may be forced out of the air exhaust. Proper care
should be taken, always wear protective clothing, eye protection & follow standard safety procedures.
WARNING: When pumping hazardous liquids, or operating the pump in an enclosed room, it is important to
provide ventilation for exhaust to a safe area.
WARNING: The surface temperature of the pump depends upon the temperature of the uid that is
being pumped. The chart below lists dierent uid temperatures and the corresponding pump surface
temperatures, which determine the Temperature Class when used in a hazardous area.
Fluid Temperature Maximum Surface
Temperature
Temperature
Class
Maxium Allowable
Surface Temperature
176oF (80oC) 176oF (80oC) T6 85oC
Safety Precautions
WARNING: Never use a natural polypropylene or natural PVDF pump with ammable or combustible uids/materials.
WARNING: For polypropylene or PVDF pumps do not exceed 120 psig (8.3 bar) air supply.
CAUTION: Before attaching air supply to pump make sure all airline debris is clear. It is recommended to use a
minimum 5µ (micron) air lter before the air valve.
CAUTION: Do not over-tighten the air inlet tting. Too much torque could damage the air valve.
CAUTION: Before maintenance or repair, close the compressed air line supply valve, bleed the pressure and
disconnect air line from the pump. Discharge line may also be pressurized. Any pressure must be relieved prior to
servicing. Isolate and remove suction / discharge lines & drain the pump. Note that ooded suction systems could
be subject to signicant leaking through the exhaust before suction isolation valve is closed.

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Material Chemical
Composition Description Operating Temperature Relative Cost
Minimum Maximum
Polypropylene Pure Polypropylene Thermoplastic that is resistant to alkali and
strong acids.
32°F
(0°C)
158°F
(70°C) $
Conductive
Polypropylene Carbon lled Polypropylene Thermoplastic that is resistant to alkali and
strong acids and conductive.
32°F
(0°C)
158°F
(70°C) $$
PVDF Pure Polyvinylidene Fluoride Strong uoropolymer with excellent chemical
resistance.
10°F
(-12°C)
220°F
(104°C) $$$
Buna Acrylonitrile-butadiene
Rubber
General purpose elastomer.Resistant to oil,
water, solvent, and hydraulic uid.
10°F
(-12°C)
190°F
(88°C) $
Neoprene Chloroprene Rubber
General purpose elastomer with good resis-
tance to moderate chemicals, oils, grease,
solvents, and some refrigerants.
0°F
(-18°C)
212°F
(100°C) $
SantopreneTM
Fully cured EPDM rubber
particles encapsulated in a
polypropylene (PP) matrix
Thermoplastic elastomer with good abrasion
resistance with chemical resistance to a wide
range of solvents and chemicals. Injection
molded with no fabric layer.
-40°F
(-40°C)
225°F
(107°C) $
PTFE Polytetrauoroethylene Chemically inert. Resistant to a wide range of
chemicals.
40°F
(4°C)
225°F
(107°C) $$
FEP Fluorinated Ethylene
Propylene
Similar to PTFE in composition and chemical
resistance. Used to encapsulate FKM o-rings for
superior chemical resistance.
40°F
(4°C)
225°F
(107°C) $$
SantopreneTM is a registered tradename of Exxon Mobil Corp.
Material Proles
Specications
Pump Type: Non-Metallic Air Operated Double Diaphragm
Weight: PP & CFPP - 2.3 lbs (1.0 kgs)
PVDF - 3.1 lbs (1.4 kgs)
Air Inlet: 1/8” FNPT or FBSPT
Max Air Inlet Pressure: 120 psig (8.3 bar)
Max Material Inlet Pressure: 10 psig (0.7 bar)
Air Consumption @ 100 psi: 8 scfm (13.6 Nm3/hr)
Noise Level: 65.3 dB(A)
Max Suction Lift: Wet - 28 ft H20 (8.5 m H2O)
Dry - 6 ft H20 (1.8 m H2O)
Max Flow Rate: 5.8 gpm (22 lpm)
Suction/Discharge Size:
Optional Center Veritcal
Suction Port:
I.D.: 1/4” FNPT/FBSPT
O.D.: 3/4” MNPT/MBSPT
O.D.: 1/4” MNPT/MBSPT
Max Particle Size: 0.06” (1.8 mm)
Max Outlet Pressure: 120 psig (8.3 bar)
Displacement Per Stroke: 0.005 gal (0.02 liter)

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Series*
FT - Pump End
FW - Wet End
Pump Size*
025 - 1/4”
Wetted Materials*
P- Polypropylene
V- PVDF
C- Conductive polypropylene**
Non-wetted Materials
P- GFRPP
C- Conductive PP**
Air Valve Material & Thread Type
1- GFRPP or Conductive Acetal - FNPT
2- GFRPP or Conductive Acetal - FBSPT
Diaphragm Materials*
R- Santoprene 1 - PTFE/Neoprene
Check Valve Ball Materials*
R- Santoprene T- PTFE
Check Valve Seat Materials*
P- Polypropylene V- PVDF
C - Carbon lled PTFE**
Check Valve Seat O-Ring Materials*
R - Santoprene C - FEP/FKM
Connection
N- Universal NPT/BSPT
Porting location
1- End (standard) 2- Center horizontal
3- Center vertical 4- Center vertical suction
& end discharge
Specials
K1 - PP drum pump kit
K2 - PVDF drum pump kit
P1 - Halogenated Hyrdocarbon Compatible
A- ATEX**
*Required for wet end
**Required for ATEX
Example Pump P/Ns: FT025P-P1-RRPR-N1, FT025P-P1-1TPC-N1, FT025V-P1-1TVC-N1 & FT025C-C2-RRCR-N1-A
Example Wet End P/Ns: FW025P-RRPR, FW025P-1TPC, FW025V-1TVC & FW025C-RRCR
PART # XX XXX X - X X - X X X X - X X - X
Non-
wetted
Material
Air Valve
Material
Diaphragm
Material
Check
Valve
Ball
Check
Valve
Seat
Seat
O-ring
Series Pump
Size
Wetted
Material Connection Porting Location
Model Number Explanation & Example Part Numbers
Specials
0 5 10 15 20
0
1
2
3
4
5
6
7
8
0
20
40
60
80
100
120
0123456
FLOWRATE - LPM
DISCHARGE HEAD - BAR (METERS)
DISCHARGE PRESSURE - PSIG (FEET)
FLOWRATE - US GPM
2 (3.4)
4 (6.8)
6 (10.2)
8 (13.6)
AIR CONSUMPTION
SCFM (Nm
3
/hr)
(46)
(92)
(138)
(185)
(278)
(41)
(20)
(31)
(51)
(61)
(71)
(231)
(82)
(10)
FT025P, FT025V, & FT025C Performance

9
Dimensional Drawing

10
Installation Drawing
Installation and Start up
Install the pump in a vertical position or it may not prime properly. Pump should be located as close to the product
being pumped as possible. Suction line length should be as short as possible and limit the number of ttings. Suction
line diameter should not be reduced smaller than the suction diameter of the pump. When using rigid pipe run short
sections of exible hose or exible connections between the pump & piping. Secure the pump to a suitable surface.
Air Supply
Connect the pump air inlet to an air supply with sucient capacity to achieve desired performance. A pressure
regulating valve should be installed to insure air supply pressure does not exceed recommended limits.
Air Valve Lubrication
No lubrication is required for the air distribution system.
Fasteners
Re-torque all fasteners before operation. Creep of housing and gasket materials may cause fasteners to loosen.
Re-torque all fasteners to the torque specications listed on page 22 in this manual.
Air Inlet & Priming
Pump will start to operate as soon as the shut-o valve is opened. It is recommended to open the shut-o valve slowly
at rst. Once the pump primes; the shut-o valve can be opened additionally to increase the pump’s ow. If the
pump is operating but not pumping any liquid see the troubleshooting section for tips & suggestions.
Accessories
Surge suppressors & lter/regulators are available and should used with FTI Air pumps.
Installation / Operation Precautions

11
PUMP WILL NOT START OR CYCLE:
• Blocked liquid pipe or hose - Clean out or replace
• Clogged liquid chamber - Remove debris
• Diaphragm shaft bushing / o-ring leak - Replace o-rings
• Air valve carrier not shifting - Inspect and clean
ERRATIC CYCLING:
• Diaphragm failure - Replace diaphragm
• Valve ball not seating properly, worn or damaged – Inspect, remove debris or replace
• Leak in suction line - Inspect, repair or replace
• Diaphragm shaft / o-ring leak - Replace o-rings
• Air valve carrier not shifting - Inspect and clean
• Over lubrication in air valve - Inspect, degrease, clean, and reuse. Remove lubrication
• Excess moisture in air valve – Inspect, dry, reuse. Consider installing an air dryer
• Worn carrier or valve bore – measure carrier and valve bore, diametrical clearance should be between .0020” - .0050”.
Replace worn components as needed
PUMP CYCLES BUT WILL NOT PUMP:
• Too much suction lift - Reduce suction lift or try lling up liquid chambers with uid
• Leak in suction line - Inspect, repair or replace
• Valve ball not seating properly, worn or damaged - Inspect, remove debris or replace
• Clogged suction pipe or hose - Inspect & clear
• Clogged strainer if used - Inspect & clear
• Diaphragm failure - Replace diaphragm
PUMPED LIQUID RELEASED FROM AIR EXHAUST
• Diaphragm failure - Replace diaphragm
• Outer plate unthreading - Tighten & re-torque
Troubleshooting Tips & Suggestions
Maintenance
Recommended Tools for Servicing Pump
• 20, 27 or 30T Torx bits, (2) 5/8”socket wrenches, snap ring pliers; 3 mm hex wrench, o-ring pick, & torque wrench.
Wet End Servicing (Installing Wet End Kit)
• Relieve airline pressure and uid line pressures before conducting maintenance.
• The pump can be drained by turning it upside down and allowing uid to drain into an appropriate container. Use
proper safety equipment when conducting maintenance as internal components may still contain the pumped media.
• Lubricate all stainless steel to stainless steel fasteners to prevent galling.

12
Remove the (4) discharge manifold bolts
(item 9) from the discharge manifold (item
16) using a T30 or T27 Torx bit.
Wet End Disassembly
5Remove the diaphragms (items
20), begin by loosening the (2)
outer plates (item 19) using two 5/8”
wrenches. Use 6-sided sockets or
wrenches to prevent damage to the
hex portion of the outer plate.
4Remove both liquid chambers by
removing the (6) self-threading screws
(item 11) using a T30 or T27 Torx bit
and (5) button head cap screws (item
17) using a T20 Torx bit. Inspect and
replace diaphragms as needed.
3Repeat the above steps for the
suction manifold (item12). The seat
o-rings, valve seats and valve balls
(items 13, 14, & 15) are located in the
liquid chambers (item 18).
2The discharge seat o-rings, valve seats
and valve balls (items 13, 14, & 15) can now
be accessed and replaced if needed.
1
3
2
5
4
1

13
7The remaining diaphragm (item 20) and
plates (items 19 & 23) may be removed from
the shaft (item 27) by hand or by placing
the shaft in a vise tted with soft jaws. Use a
6-sided 5/8” wrench to remove the remaining
diaphragm and plates. Soft jaws are required
to prevent damage to the shaft. A damaged
shaft with result in accelerated o-ring wear.
Jaws can be tted with wood, plastic, rubber,
or other soft material to prevent shaft damage.
6Remove the outer plate, diaphragm(s), and inner plate (items 19, 20, 21, 22, & 23) from the side that
is loosened. Pull or push the shaft (item 27) and remaining plates and diaphragms out of the center
section. If pulling, it may be easier to grip the diaphragm if it is inverted.
After performing required maintenance, the pump can be reassembled. The pump can also be reassembled using the
disassembly instructions in the reverse order as listed above. For detailed assembly instructions, follow steps Wet End
Reassembly instructions on next page.
7
6 6

14
Wet End Reassembly
Apply a medium strength thread locker, such
as Loctite® 246, to the outer plate (19) bolt threads
and shaft (item 27) threads. To ensure thread
locker cures quickly, a primer such as Loctite®
SF7649 should be used. Thread the shaft onto the
outer plate bolt until it is snug.
3
1
Slide the center hole of one diaphragm
(item 20) over the molded in bolt of an outer
plate (item 19). For both PTFE and Santo-
prene™ fitted pumps the outer plate should be
on the convex face of the diaphragm as shown.
1
3
For Santoprene tted pumps place the inner
plate (item 23) over the bolt so that the round
groove in the inner plate faces the diaphragm.
For PTFE tted pumps place the small diaphragm
o-ring (item 22) into the groove of the diaphragm.
Then place the inner plate over the bolt so that
the round groove in the inner plate faces the dia-
phragm.
2
The shaft (item 27) and shaft bushing assem-
bly (items 24. 25 & 26) should retain the lubricant
that was factory applied. If they appear dry, apply
a light coat of lithium thickened grease. Avoid over
lubrication as it can cause decreased performance
of the air distribution system.
4
4
2

15
Push the shaft (item 27) through the center of
the center section (item 28).
The other diaphragm(s) (item 17) and inner/
outer plates (items 19 & 23) can be installed onto
the opposite end of the shaft (item 27). It may be
easier to thread the molded in bolt into the shaft if
the diaphragm(s) is inverted on one or both sides.
This can be done by hand.
Tighten and torque the outer plates (item 19)
to 40 in-lbs (4.5 N-m).
7
7
For PTFE tted pumps place the large
diaphragm o-ring (item 21) into the groove in
the center section (item 28).
5
5
6
6
8
8

16
Install the liquid chambers (item 18) by plac-
ing one side over the diaphragm. Start all 6 screws
(item 11) before tightening and torqueing. Torque
all fasteners in a star pattern to 50 in-lbs (5.6 N-m).
Start all 5 screws (item 17) before tightening and
Torqueing. Torque all screws in a X Pattern to 30
in-lbs (3.4 N-m). Repeat to install the second liquid
chamber. Ensure both chambers are orientated
the same and that the inlet and outlet ports are
vertical when facing the front of the pump.
IMPORTANT: Threads must line up or stripping of
threads can occur.
Flip the pump upside down and drop the suc-
tion valve balls (item 15) into the liquid chambers
(item 18) ball cages.
Place the valve seats (item 14) into the seat
bore then the valve seat o-rings (item 13) into the
groove that is formed by the seats.
Place the suction manifold (item 12) atop the
pump. Tighten and torque the suction manifold
bolts (item 11) in an “X”pattern. Torque to 50 in-
lbs (5.6 N-m)
11
910
910
11 12
12
Item 11 -
6 screws each side
Item 17 -
5 screws each side

17
Stand the pump upright onto the
suction manifold feet (item 12). Place the
valve balls (item 15), valve seats (item 14), and
seat o-rings (item 13) into the discharge
manifold (item 16) in the same order as the
suction side was done in step 11. Place the
discharge manifold atop the pump, tighten,
and torque the discharge manifold bolts (item
11) in an “X” pattern. Torque to 50 in-lbs (5.6 N-m).
Air End Servicing (Installing Air End Kit)
• Follow steps 1 – 6 in the Wet End Servicing disassembly section to access the shaft bushings (items 24), then follow
steps below.
1To replace the shaft bushings (item 24),
carefully remove the old bushings. Remove the
bushing hold down screw (item 17) using a T20
Torx bit. Use 1 or 2 at head screw drivers to pry
the bushing out. Repeat for the other side.
2Bushings (item 24) are supplied with both
o-rings (items 25 & 26). Lubricate the o-rings (item
25) with a compatible lubricant and push it into
the bushing (item 28) gland in the center section.
Reinstall the bushing hold down screw (item 17).
2
1
Shaft & Bushing Replacement
13 13

18
4Inspect the shaft (item 27) for damage. It is
common for shafts to become grooved during
service. Grooving is normally caused by carbonized
oil and/or abrasive foreign material getting trapped
between the seal and the shaft. Over time, deep
grooves can form in the shaft. When that occurs, it
is recommended that the shaft be replaced.
4
1Plastic Air Valve. To replace the valve cup
(item 6) or valve cup o-rings (item 5) remove the
retaining ring (item 7), then pull straight up. The
use of an m6 bolt, vise grip, and pry bars may be
necessary. See 1 and 1A pictures.
1
• After determining if the condition of the shaft is acceptable, follow steps 5 – 13 in the Wet End Servicing – Wet End
Reassembly section to rebuild the rest of the pump.
Air Valve O-Ring Replacement
2Plastic Air Valve - Remove and replace o-rings.
Insert cap (item 6) push down until groove for the
retaining ring is visible. Make sure to lubricate the
o-rings prior to inserting into the valve body with
a compatible lubricant.
2
3If replacing the bushings (item 24), then the
muer felt (NS) should also be replaced prior to
replacing the second bushing. It is important when
installing the felt that it does not block the air slot.
Lubricate the bushing o-rings (item 25) and press it
into the open bushing gland. Reinstall the bushing,
hold down screw (item 17).
3
1A
Air Slot

19
Valve Gasket Replacement
1Remove the valve body (item 2) by removing
the four (4) socket head cap screws (item 1) that
attach the valve body to the center section (item
23) with a 3mm hex wrench
1
2Pull the valve body (item 2) o the front of the
center sectin (item 23).
2
3Place the new gasket (item 8) on the air valve (item 2) and ensure the slots in the gasket align with the slots in the
air valve and valve plate (item 7).
Air Valve Slide, Plate & Gasket Orientation: If the valve plate (item 7) and slide valve (item 6) are removed, ensure they
are installed in the proper orientation. The at face of the slide valve sits in the pocket of the valve carrier (item 5) so
that the square cut out on the slide valve faces the smooth polished side of the valve plate
3 33

20
Replacement Air Valve Kit Installation
1. Remove the valve that is to be replaced by removing the (4) socket head cap screws with a 3mm hex wrench that
attaches the valve body to the center section.
2. Save the (4) cap screws (item 1). All other valve components can be
discarded.
3. Remove the packing tape that holds the air valve components in place during shipping.
• Follow steps 3 – 5 in the Valve Gasket section of Air End Servicing above.
5First hand tighten only each cap screw (item
1) until the cap screw head makes contact with
the valve body. Torque the cap screws in an “X”
pattern. Do not exceed 15 in-lbs (1.7 N-m).
5
4Insert the (4) cap screws (item 1) through the
valve body and gasket (items 2 & 10) and place
onto the center section (item 8). Ensure the slide
valve and valve plate (items 8 & 9) are in place and
the valve sits at on the center section.
4