Graco ChemSafe 307 Operation manual

Instructions-Parts
ChemSafe™ 307
Air-Operated Diaphragm Pump 334793D
EN
3/8–inch high purity pump for industrial applications. For professional use only.
Not approved for use in European explosive atmosphere locations.
Important Safety Instructions
Read all warnings and instructions in this manual. Save these
instructions.
100 psi (0.7 MPa, 7.0 bar) Maximum Air
Supply Pressure
100 psi (0.7 MPa, 7.0 bar) Maximum
Fluid Working Pressure
PROVEN QUALITY. LEADING TECHNOLOGY.

Contents
Warnings ........................................................... 3
Configuration Number Matrix............................... 6
Installation.......................................................... 8
General Information ..................................... 8
Tighten Bolts ............................................... 8
Tips to Reduce Cavitation............................. 8
Mount The Pump ......................................... 9
Ground The System ..................................... 10
Air Lines...................................................... 10
Air Exhaust Ventilation ................................. 11
Fluid Supply Line ......................................... 12
Fluid Outlet Line........................................... 12
Operation........................................................... 13
Tighten Bolts ............................................... 13
Flush the Pump Before First Use .................. 13
Start and Adjust the Pump............................ 13
Pressure Relief Procedure............................ 14
Pump Shutdown .......................................... 14
Maintenance ...................................................... 15
Maintenance Schedule................................. 15
Lubrication................................................... 15
Tighten Threaded Connections ..................... 15
Flushing and Storage ................................... 15
Troubleshooting.................................................. 16
Repair................................................................ 18
Disassemble the Fluid Section ...................... 18
Disassemble the Center Section ................... 19
Reassemble the Center Section.................... 19
Reassemble the Fluid Section....................... 20
Torque Instructions ............................................. 22
Parts.................................................................. 24
Kits.................................................................... 26
Dimensions ........................................................ 27
Performance Charts............................................ 28
Technical Data ................................................... 29
2334793D

Warnings
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The
exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific
risks. When these symbols appear in the body of this manual or on warning labels, refer back to these
Warnings. Product-specific hazard symbols and warnings not covered in this section may appear throughout
the body of this manual where applicable.
WARNING
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help
prevent fire and explosion:
• Use equipment only in well ventilated area.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and
plastic drop cloths (potential static arc).
•Keepwork
area free of debris, including solvent, rags and gasoline.
• Do not plug or unplug power cords, or turn power or light switches on or off when flammable
fumes are present.
• Ground all equipment in the work area. See Grounding instructions.
•Useonly
grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless
they are antistatic or conductive.
•Stop operation immediately if static sparking occurs or you feel a shock.Do not use
equipment until you identify and correct the problem.
• Keepaw
orking fire extinguisher in the work area.
• Route exhaust away from all ignition sources. If diaphragm ruptures, fluid may be exhausted
with air.
Static charge may build up on plastic parts during cleaning and could discharge and ignite
flammable vapors. To help prevent fire and explosion:
• Clean plastic parts only in well ventilated area.
• Do not cleanwithadrycloth.
• Do not operate electrostatic guns in equipment work area.
PRESSURIZED EQUIPMENT HAZARD
Fluid from the equipment, leaks, or ruptured components can splash in the eyes or on skin
and cause serious injury.
•Fol
low the Pressure Relief Procedure when you stop spraying/dispensing and before
cleaning, checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
334793D 3

Warnings
WARNING
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated
system component. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data
in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete
information about your material, request MSDS from distributor or retailer.
• Do not leave the work area while equipment is energized or under pressure.
•Turnoffall
equipment and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment. Alterations or modifications may void agency approvals
and create safety hazards.
•Makesure
all equipment is rated and approved for the environment in which you are using it.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
THERMAL EXPANSION HAZARD
Fluids subjected to heat in confined spaces, including hoses, can create a rapid rise in pressure
due to the thermal expansion. Over-pressurization can result in equipment rupture and serious
injury.
• Open a valve to relieve the fluid expansion during heating.
• Replace hoses proactively at regular intervals based on your operating conditions.
PLASTIC PARTS CLEANING SOLVENT HAZARD
Many solvents can degrade plastic parts and cause them to fail, which could cause serious
injury or property damage.
• Use only compatible water-based solvents to clean plastic structural or pressure-containing
parts.
•SeeTechnical Data in this and all other equipment instruction manuals. Read fluid and
solvent manufacturer’s MSDSs and recommendations.
4334793D

Warnings
WARNING
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin,
inhaled, or swallowed.
• Read MSDSs to know the specific hazards of the fluids you are using.
• Route exhaust away from work area. If diaphragm ruptures, fluid may be exhausted into
the air.
• Store hazardous fluid in approved containers, and dispose of it according to applicable
guidelines.
BURN HAZARD
Equipment surfaces and fluid that’s heated can become very hot during operation. To avoid
severe burns:
• Do not touch hot fluid or equipment.
PERSONAL PROTECTIVE EQUIPMENT
Wear appropriate protective equipment when in the work area to help prevent serious injury,
including eye injury, hearing loss, inhalation of toxic fumes, and burns. This protective
equipment includes but is not limited to:
•Protect
ive eyewear, and hearing protection.
• Respirators, protective clothing, and gloves as recommended by the fluid and solvent
manufacturer.
334793D 5

Configuration Number Matrix
Configuration Number
Matrix
Check the identification plate (ID) for the
Configuration Number of your pump. Use the
following matrix to define the components of your
pump.
Sample Configuration Number: 307PT-P01APT3PTPTPOPT
307PT P01A PT3 PT PT PO PT
Pump
Model
Center
Section
and Air
Valve
Fluid
Covers
and
Manifolds
Seats Balls Diaphragms Manifold and Seat Seals
Pump Center Section and Air
Valve Material
Fluid Covers and Manifolds
307PT
3/8 in. PTFE
P01A Polypropylene
center with npt
air inlet
PT3 PTFE, npt
307UH
3/8 in. UHMWPE
P03A Polypropylene
centerwith
bspt air inlet
PT4 PTFE, bspt
UH3 UHMWPE, npt
UH4 UHMWPE, bspt
Seat Material Ball Material Diaphragm Material Manifold and Seat
Seal Material
PT PTFE PT PTFE BN Buna NPT PTFE
EP EPDM
PO PTFE Overmolded
6334793D

Configuration Number Matrix
Models
Model Pump Air & Fluid
Connection
Threads
Fluid Covers &
Manifolds
Balls &
Seats
Diaphragm Manifold Seal
24X428 bspt
24X427 3/8 in. PTFE npt PTFE
24X504 bspt
24X503 npt
PTFE/EPDM
Overmolded
24X536 bspt
24X537 npt EPDM
24X502 bspt
24X501
3/8 in.
UHMWPE
npt
UHMW
PTFE
Buna N
PTFE
334793D 7

Installation
Installation
General Information
The Typical Installation shown is only a guide for
selecting and installing system components. Contact
your Graco distributor for assistance in planning a
system to suit your needs. Always use Genuine
Graco Parts and accessories. Be sure all accessories
are adequately sized and pressure rated to meet the
system’s requirements.
Reference letters in the text, for example (A), refer to
the callouts in the figures.
Variations in color between the plastic components
of this pump are normal. Color variation does not
affect the performance of the pump.
Storage: Pumps that are not put into operation
upon delivery must be stored appropriately. See
Flushing and Storage, page 15.
Tighten Bolts
Before mounting and using the pump for the
first time, check and retorque all external bolts.
Remove all protective bolt covers (37). Follow
Torque Instructions, page 22, to tighten all bolts.
Replace the bolt covers (37). After the first day of
operation, retorque the bolts. Retorque the bolts if the
pump has been idle for an extended time, been used
in thermal cycling applications, been disassembled,
or if there is a large difference between environmental
temperatures and fluid temperatures.
Tips to Reduce Cavitation
Cavitation in an AODD pump is the formation and
collapse of bubbles in the pumped liquid. Frequent
or excessive cavitation can cause serious damage,
including pitting and early wear of fluid chambers,
balls, and seats. It may result in reduced efficiency of
the pump. Cavitation damage and reduced efficiency
both result in increased operating costs.
Cavitation depends on the vapor pressure of the
pumped liquid, the system suction pressure, and the
velocity pressure. It can be reduced by changing any
of these factors.
1. Reduce vapor pressure: Decrease the
temperature of the pumped liquid.
2. Increase suction pressure:
a. Lower the installed position of the pump
relative to the liquid level in the supply.
b. Reduce the friction length of the suction
piping. Remember that fittings add friction
length to the piping. Reduce the number of
fittings to reduce the friction length.
c. Increase the size of the suction piping.
3. Reduce liquid velocity: Slow the cyclic rate of
the pump.
Pumped liquid viscosity is also very important but
normally is controlled by factors that are process
dependent and cannot be changed to reduce
cavitation. Viscous liquids are more difficult to pump
and more prone to cavitation.
Graco recommends taking all the above factors
into account in system design. To maintain pump
efficiency, supply only enough air pressure to the
pump to achieve the required flow.
Graco distributors can supply site specific
suggestions to improve pump performance and
reduce operating costs.
8334793D

Installation
Mount The Pump
To avoid serious injury from toxic fluid or fumes:
• Ventilate to a remote area. The pump
exhaust air may contain contaminants. See
Air Exhaust Ventilation, page 11.
• Never move or lift a pump under pressure. If
dropped, the fluid section may rupture. Always
follow the Pressure Relief Procedure, page 14,
before moving or lifting the pump.
1. Mount the pump so the exhaust port remains
clear of the production area. Exhaust air may
contain debris and condensation from the air
supply and air chamber.
2. Be sure the mounting surface can support the
weight of the pump, hoses, and accessories, as
well as the stress caused during operation.
3. For all mountings, be sure the pump is secured
with screws through the mounting feet. Always
mount the pump upright.
4. Make sure the surface is flat and that the pump
doesn’t wobble.
5. For ease of operation and service, mount the
pump so air inlet, fluid inlet and fluid outlet ports
are easily accessible.
Accessories/Components Not Supplied System Components
A Air supply line J Air inlet port
BBleed-type master air valve (required
for your pump)
KExhaust port and muffler
C Air filter/regulator assembly L Fluid inlet port
DMaster air valve (to isolate the
filter/regulator for service)
M Fluid outlet port
EGrounded flexible fluid supply line NMounting feet
FFluid drain valve (required for your
pump)
GF
luid shutoff valve
HGrounded, flexible fluid outlet line
334793D 9

Installation
Ground The System
The equipment must be grounded to reduce the
risk of static sparking. Static sparking can cause
fumes to ignite or explode. Grounding provides an
escape wire for the electrical current.
•Always ground the entire fluid system as
described below.
• The pumps are not conductive. Any system
used to pump flammable fluids must be properly
grounded.
• Follow your local fire codes.
Before operating the pump, ground the system as
explained below.
•Pump: Always ground the entire fluid system by
making sure the fluid has an electrical path to a
true earth ground.
•Air and fluid hoses: Use only flexible grounded
hoses with a maximum of 500 ft. (150 m) combined
hose length to ensure grounding continuity.
•Air compressor: Follow manufacturer’s
recommendations.
•Fluid supply container: Follow local code.
•Solvent pails used when flushing: Follow local
code. Use only conductive metal pails, placed
on a grounded surface. Do not place the pail
on a nonconductive surface, such as paper or
cardboard, which interrupts grounding continuity.
Check your system electrical continuity after the
initial installation, and then set up a regular schedule
for checking continuity to be sure proper grounding
is maintained.
Air Lines
1. Install an air regulator and gauge (C) to control
the fluid pressure. The fluid stall pressure will be
thesameasthesetting of the air regulator.
2. Locate a bleed-typemasterairvalve(B)closeto
the pump and use it to relieve trapped air. Be
sure the valve is easily accessible from the pump
and located downstream from the regulator.
Trapped air can cause the pump to cycle
unexpectedly, which could result in serious
injury from splashing.
3. Locate another master air valve (D) upstream
from all air line accessories and use it to isolate
them during cleaning and repair.
4. An air line filter (C) removes harmful dirt and
moisture from the compressed air supply.
5. Install a grounded, flexible air hose (A) between
the accessories and the 1/8 npt(f) or 1/8 bspt
pump air inlet. Use a hose with a minimum 1/4 in.
ID.Ifah
ose longer than 10 ft. (3 m) is required,
use a larger diameter hose.
10 334793D

Installation
Air Exhaust Ventilation
If pumping toxic fluids, you must vent the exhaust
away from people, animals, food handling areas,
and all sources of ignition. Follow all applicable
codes.
NOTE: Do not restrict the air exhaust port. Excessive
exhaust restriction can cause erratic pump operation.
To provide a remote exhaust:
1. Use Kit 17F610 (NPT) or 17F611 (BSPT), sold
separately.
2. Remove the muffler (U) from the pump air
exhaust port (K).
3. Install the adaptor from the kit.
4. Install a grounded air exhaust hose (S). If a hose
longer than 10 ft. (3 m) is required, use a larger
diameter hose. Avoid sharp bends or kinks in
the hose.
5. Place a container (T) at the end of the air exhaust
linetocatc
h fluid in case a diaphragm ruptures.
If the diaphragm ruptures, the fluid being pumped
will exhaust with the air.
A Air supply line S Grounded air exhaust hose
JAir inlet port (not visible) TContainer for remote air exhaust
K Exhaust port U Muffler
334793D 11

Installation
Fluid Supply Line
1. Use grounded, flexible fluid hoses (E). See
Ground The System, page 10.
2. If the inlet fluid pressure to the pump is more
than 25% of the outlet working pressure, the
ball check valves will not close fast enough,
resulting in inefficient pump operation. Excessive
inlet fluid pressure also will shorten diaphragm
life. Approximately 3–5 psi (0.02–0.03 MPa,
0.21–0.34 bar) should be adequate for most
materials.
3. For maximum suction lift (wet and dry), see
Technical Data, page 29. For best results, always
install the pump as close as possible to the
material source. Minimize suction requirements
to maximize pump performance.
Fluid Outlet Line
1. Use grounded, flexible fluid hoses. See
Ground The System, page 10,
2. Install a fluid drain valve (F) near the fluid outlet.
3. Install a shutoff valve (G) in the fluid outlet line.
12334793D

Operation
Operation
Tighten Bolts
Before mounting and using the pump for the
first time, check and retorque all external bolts.
Remove all protective bolt covers (37). Follow
Torque Instructions, page 22, to tighten all bolts.
Replace the bolt covers (37). After the first day of
operation, retorque the bolts. Retorque the bolts if the
pump has been idle for an extended time, been used
in thermal cycling applications, been disassembled,
or if there is a large difference between environmental
temperatures and fluid temperatures.
Flush the Pump Before First Use
The pump was tested in water. If water could
contaminate the fluid you are pumping, flush the
pump thoroughly with a compatible solvent. See
Flushing and Storage, page 15.
Start and Adjust the Pump
NOTICE
To avoid damage to your pump, be certain that all
pumped fluids arecompatiblewithwettedparts.
See Technical Data, page 29.
1. Be sure the pump is properly grounded. See
Ground The System, page 10.
2. Check fittings to be sure they are tight. Use a
compatible liquid thread sealant on male threads.
NOTICE
Do not overtighten fluid inlet and outlet fittings.
The soft plastic threads can be stripped easily.
3. Place the suction tube (if used) in fluid to be
pumped.
NOTE: If fluid inlet pressure to the pump is more
than 25% of outlet working pressure, the ball
check valves will not close fast enough, resulting
in inefficient pump operation.
NOTICE
Excessive fluid inlet pressure can reduce
diaphragm life.
4. Place the end of the fluid hose into an appropriate
container.
5. Close the fluid drain valve (F).
6. Back out the air regulator knob and open all
bleed-type master air valves.
7. If the fluid hose has a dispensing device, hold
it open.
8. Slowly increase air pressure with the air regulator
until the pump just starts to cycle. Allow the
pump to cycle slowly until all air is pushed out of
the lines and the pump is primed.
NOTE: Use lowest possible air pressure to prime,
just enough to cycle the pump. If the pump does
not prime as expected, turn air pressure DOWN.
9. If you are flushing, run the pump long enough to
thoroughly clean the pump and hoses.
10. Close the bleed-type master air valve.
334793D 13

Operation
Pressure Relief Procedure
Follow the Pressure Relief Procedure
whenever you see this symbol.
This equipment stays pressurized until pressure
is relieved manually. To help prevent serious
injury from pressurized fluid, such as splashing
in the eyes or on skin, follow the Pressure Relief
Procedure when you stop pumping and before you
clean, check, or service the equipment.
1. Shut off the air supply to the pump.
2. Open the dispensing valve, if used.
3. Open the fluid drain valve to relieve fluid
pressure. Have a container ready to catch the
drainage.
Pump Shutdown
At the end of the work shift and before you check,
adjust, clean, or repair the system, follow the
Pressure Relief Procedure, page 14.
14334793D

Maintenance
Maintenance
Maintenance Schedule
Establish a preventive maintenance schedule
based on the pump’s service history. Scheduled
maintenance is especially important to prevent spills
or leakage due to diaphragm failure. A clogged
muffler may restrict pump performance. Inspect
air lines and muffler media regularly to maintain
performance.
Lubrication
Thepumpislubricated at the factory. It is designed
to require no further lubrication for the life of the
packings. There is no need to add an inline lubricator
under normal operating conditions.
Tighten Threaded Connections
Before each use, check all hoses for wear or damage
and replace as necessary. Check to be sure all
threaded connections are tight and leak-free. Check
mounting bolts. Check bolts. Tighten or retorque as
necessary. Although pump use varies, a general
guideline is to retorque bolts every two months. See
Torque Instructions, page 22.
Flushing and Storage
•Flushbefor
e fluid can dry in the equipment, at the
end of the day, before storing, and before repairing
equipment.
•Flushatth
e lowest pressure possible. Check
connectors for leaks and tighten as necessary.
• Use solvent that is compatible with the equipment
wetted parts and the material being dispensed.
•Alwaysflu
shthepumpandrelievethepressure
before storing it for any length of time.
NOTICE
Flush the pump often enough to prevent the fluid
you are pumping from drying or freezing in the
pump and damaging it.
Storage: Pumpsmustbestoredinanenvironment
where they are clean, dry, and protected from
extreme temperatures, UV radiation, and vibration.
Graco recommends an ambient temperature range of
60°F-80°F (15°C-25°C), with a humidity level below
65%.
334793D 15

Troubleshooting
Troubleshooting
Problem Cause Solution
Pump is running too fast, causing
cavitation before prime.
Lower inlet pressure.
Check valve ball is severely warn
or wedged in seat or manifold.
Replace ball and seat.
Seat is severely worn. Replace ball and seat.
Outlet or inlet is clogged. Unclog.
Inlet or outlet valve is closed. Open.
Inlet fittings or manifolds are loose. Tighten.
Pump cycles but will not prime.
Manifold o-rings are damaged. Replace o-rings.
Pump cycles at stall or fails to hold
pressure at stall.
Check valve balls, seats or o-rings
are worn.
Replace.
Spool valve is stuck or dirty. Disassemble and clean air
valve. Use clean dry air.
Air supply pressure too low. Increase air supply pressure.
Spool valve is worn or damaged. Replace spool valve.
Check valve ball is severely worn
or wedged in seat or manifold.
Replace ball and seat.
Dispensing valve is clogged. Relieve pressure and clear valve.
Pump will not cycle, or cycles once
and stops.
Diaphragm is ruptured. Replace.
Suction line is clogged. Inspect; clear.
Check valve balls are sticky or
leaking.
Clean or replace.
Diaphragm is ruptured. Replace.
Exhaust is restricted. Remove restriction.
Spool valve is damaged or worn. Replace spool valve.
Air supply is erratic. Repair air supply.
Pump operates erratically.
Exhaust muffler is icing. Use drier air supply.
Suction line is loose. Tighten.
Diaphragm is ruptured. Replace.
Manifolds are loose, or seats or
manifold o-rings are damaged.
Tighten manifold bolts or replace
seats and/or o-rings.
Diaphragm glide seals or o-rings
are damaged.
Replace.
Air bubbles in fluid.
Pump is cavitating. Reduce pump speed, increase
suction hose diameter, or increase
inlet head.
Exhaust air contains fluid being
pumped.
Diaphragm is ruptured. Replace.
Moisture in exhaust air. Inlet air has high humidity. Use drier air supply.
16 334793D

Troubleshooting
Problem Cause Solution
Pump exhausts excessive air at
stall.
Spool valve seals are worn or
damaged.
Replace.
Fluid covers are loose. Retorque.
Diaphragm is damaged. Replace.
Pump leaks air externally.
Manifold fittings are loose Retorque.
Fluid covers are loose. Retorque.
Pump leaks fluid externally.
Diaphragms are damaged. Replace.
334793D 17

Repair
Repair
NOTE: Before repairing the pump, follow the
Pressure Relief Procedure, page 14.
Disassemble the Fluid Section
1. Remove all bolt covers (37).
2. Usea3mmAllenwrenchtoremovethebase
plates (12) and the inlet manifold (10).
3. Remove the check seat (21) and ball (22).
Without scratching the inner bore, use a hook to
remove the inlet ball retainer (20).
4. Turn over the pump.
5. Usea3mmAllenwrenchtoremovetheoutlet
manifold (8) and retainer (11).
6. Without scratching the inner bore, use a hook to
remove the outlet ball retainer (19). Remove the
ball (22) and check seat (21).
7. Reattach the manifold bolts (29) to keep the fluid
cover nuts (18) aligned.
8. Remove the nuts (28) and bolts (24) using two 7
mm sockets, to hold on one side and to turn the
other. The nuts (28) will come off of one side.
Remove the bolts (24).
NOTE: The nuts are permanently affixed to one
end of the bolts.
9. Remove the fluid cover retainers (9) and the fluid
covers (6) from the body (1).
18 334793D

Repair
Disassemble the Center Section
1. One diaphragm (25) should screw off by hand.
Slide the second diaphragm out with the shaft
(5) still attached.
2. Use the supplied tool (46) to remove the muffler
cap (14) from the body. Remove all muffler parts.
Inspect the mesh baffle spacers (38) and felt
mufflers (15). Replace as needed.
3. Use the supplied tool (45) to remove the sleeve
caps (3). Remove the shaft glide seal (17) and
o-ring (32) from the ID of the caps. Remove
o-ring (35) from the face of each cap. Remove
the EPDM ring (36) from the seat for each sleeve
cap.
4. Use an appropriate-sized socket to press out the
main and center sleeve assemblies (2 & 4).
Reassemble the Center Section
1. Install the muffler media (15 & 38) into the
muffler. Use the new felt mufflers (15‡) supplied
in the rebuild kit. Muffler parts must be placed
in the exact order shown in the illustration. Use
the supplied tool (46) to screw the muffler (14)
into the exhaust port (the port with 2 holes on the
bottom).
2. Lubricate and install an o-ring (35) and then the
shaft glide seal (17‡) in the ID of each sleeve cap
(3). Lubricate and install an o-ring (32‡) on the
face of each sleeve cap (3).
3. Lubricate and install an EPDM ring (36‡) into
the seat for the sleeve cap (3), in the center of
the body (1).
4. Apply medium-strength thread locker to the
threads of a sleeve cap (3). Use the tool (45) to
install it into one side of the body just until it is
flush with the surface. Do not overtighten.
334793D 19

Repair
5. Turn the center section over. Spread a thin film
of lubricant evenly across the o-rings on the main
and center assemblies (2 & 4). Be careful not
to plug the air holes. Put the center assembly
(4) inside the main assembly (2), and use an
appropriate-sized socket to press the sleeve
assemblies into the body.
6. Lubricate and install an EPDM ring (36‡) into
the seat for the sleeve cap, in the center of the
body (1).
7. Apply medium-strength thread locker to the
threads of the second sleeve cap (3). Use the
tool (45) to install the second sleeve cap (3) into
the body. Tighten just until the cap is flush with
the surface. Do not overtighten.
8. If using new diaphragms, remove the thread
cover on each diaphragm (25†).
9. Tighten the pump shaft (5) onto one diaphragm,
hand tight only. Do not use any tools on the shaft.
10. Lubricate the shaft, then install it in the body.
Turn the diaphragm as you push it in. Then,
tighten the other diaphragm onto the shaft, hand
tight only.
Reassemble the Fluid Section
1. Insert the top two fluid cover nuts (18), threaded
end first.
2. Thread the manifold bolts (29) a few turns into
the nuts (18), just to keep the nuts from rotating.
3. Repeat steps 1 and 2 for the other fluid cover.
4. Install the fluid covers with the top checks toward
the air inlet.
5. Place two belleville washers (27), with the washer
closest to the nut having the rounded side toward
the nut and the other washer with the rounded
side away from the nut, then a flat washer (26)
on each tie bolt (24). Thread the first tie bolt (24)
through one fluid cover retainer (9), and then the
second tie bolt (24) through the other fluid cover
retainer (9). This necessary so that the first two
tie bolts come in from opposite sides to help keep
everything together before clamping.
6. Thread a fluid cover (6), the center section
assembly, the other fluid cover (6) onto the tie
first two tie bolts (24) and between the fluid cover
retainers (9).
7. Place the assembly in a clamp or vice. Tighten
so the first two tie bolts (24) are is exposed on
each side. Thread the remaining tie bolts (24)
through the assembly.
8. Place a flat washer (26), two belleville washers
(27), with the washer closest to the nut having
the rounded side toward the nut and the other
washer with the rounded side away from the nut,
and a nut (28) on each tie bolt. Tighten the bolts
hand-tight. Do not tighten to torque specification
yet.
20 334793D