Page 3 of 8PD15P -X
GENERAL DESCRIPTION
The ARO diaphragm pump offers high volume delivery evenat low air
pressureand a broad range of material compatibility options available.
Referto the model and option chart. ARO pumps feature stall resistant
design, modular air motor / fluid sections.
Air operated double diaphragm pumps utilize a pressure differentialin
theair chambers to alternately create suction and positive fluid pressure
in the fluid chambers, ball checks insure a positive flow of fluid.
Pumpcycling will begin as air pressure is applied and it will continue to
pumpand keep up with the demand. It will build and maintain line pres-
sureand will stop cycling once maximum line pressure is reached (dis-
pensing device closed) and will resume pumping as needed.
AIR AND LUBE REQUIREMENTS
WARNING EXCESSIVE AIR PRESSURE. Can cause pump
damage, personal injury or property damage.
SAfilter capable of filtering out particles larger than 50 microns should
beused on the air supply. There is no lubrication required other than
the “O” ring lubricant which is applied during assembly or repair.
SIflubricated air is present, make sure that it is compatible with the “O”
rings and seals in the air motor section of the pump.
INSTALLATION
SVerifycorrect model / configuration prior to installation.
SRetorque all external fasteners per specifications prior to start up.
SPumpsare tested in water at assembly. Flush pump with compatible
fluid prior to installation.
SWhen the diaphragm pump is used in a forced-feed (flooded inlet)
situation,it is recommended that a “Check Valve” be installed at the
air inlet.
SMaterialsupply tubing should be at least the same diameter as the
pump inlet manifold connection.
SMaterialsupply hose must be reinforced, non-collapsible type com-
patible with the material being pumped.
SPipingmust be adequately supported. Do not use the pump to sup-
port the piping.
SUse flexible connections (such as hose) at the suction and dis-
charge. These connections should not be rigid piped and must be
compatible with the material being pumped.
SSecure the diaphragm pump legs to a suitable surface (level and
flat) to insure against damage by vibration.
SPumpsthat need to be submersed must have both wet and non-wet
components compatible with the material being pumped.
SSubmersed pumps must have exhaust pipe above liquid level. Ex-
haust hose must be conductive and grounded.
SFlooded suction inlet pressure must not exceed 10 p.s.i.g. (0.69
bar).
OPERATING INSTRUCTIONS
SAlways flush the pump with a solvent compatible with the material
beingpumped if the material being pumped is subject to “setting up”
when not in use for a period of time.
SDisconnectthe air supply from the pump if it is to be inactive for a few
hours.
PARTS AND SERVICE KITS
Referto the part views and descriptions as provided on page 4 through 7
for parts identification and Service Kit information.
SCertainARO “Smart Parts” are indicated which should be available
for fast repair and reduction of down time.
SService kits are divided to service two separate diaphragm pump
functions:1.AIRSECTION,2.FLUIDSECTION.TheFLUIDSEC-
TIONis divided further to match typical part MATERIAL OPTIONS.
MAINTENANCE
SProvide a clean work surface to protect sensitive internal moving
partsfrom contamination from dirt and foreign matter during service
disassembly and reassembly.
SKeep good records of service activity and includepump in preven-
tive maintenance program.
SBefore disassembling, empty captured material in the outlet man-
ifold by turning the pump upside down to drain material from the
pump.
FLUID SECTION DISASSEMBLY
1. Remove (61) outlet manifold and (60) inlet manifold.
2. Remove (22) balls, (19 and 33) “O” rings and (21) seats.
3. Remove (15) fluid caps.
NOTE:Only PTFE diaphragm models use a primary diaphragm (7) and
abackup diaphragm (8). Refer to the auxiliary view in the Fluid Section
illustration.
4. Remove the (6) diaphragm washer, (7) or (7 / 8) diaphragms, and (5)
backup washer.
NOTE: Do not scratch or mar the surface of (1) diaphragm rod.
FLUID SECTION REASSEMBLY
SReassemble in reverse order.Refer to the torque requirements on
page 5.
SClean and inspect all parts. Replace worn or damaged parts with
new parts as required.
SLubricate (1) diaphragm rod and (144) “U” cup with LubriplateR
FML-2 grease (94276 grease packet is included in service kit).
SFormodels with PTFE diaphragms: Item (8) Santoprene diaphragm
isinstalled with the side marked “AIR SIDE” towards the pump cen-
ter body. Install the PTFE diaphragm (7) with the side marked
“FLUID SIDE” towards the (15) fluid cap.
SRe-checktorque settings after pump has been re-started and run a
while.
SVitonRandHytrelRare trademarks of the DuPont Company, SKynarRis a registeredtrademark of Penwalt Corp. SLoctiteRis a registered trademark of Henkel Loctite Corporation S
SSantopreneRisa registered trademark of Monsanto Company,licensed to Advanced Elastomer Systems, L.P., SLubriplateRis a registered trademark of LubriplateDivision (Fiske Brothers) S