Page 3 of 8PD30X-X-B
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, valve 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.
SIf lubricated air is present, make sure that it is compatible with the
Nitrile “O” rings in the air motor section of the pump.
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.
STheoutlet material volume is governed not only by the air supply but
alsoby the material supply available at the inlet. The material supply
tubingshould not be too small or restrictive. Be sure not to use hose
which might collapse.
SWhen the diaphragm pump is used in a forced-feed (flooded inlet)
situationit is recommended that a “Check Valve” be installed at the
air inlet.
SSecure the diaphragm pump legs to a suitable surface to insure
against damage by vibration.
MAINTENANCE
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.
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.
SBeforedisassembling emptycapturedmaterial inthe outletmanifold
by turning the pump upside down to drain material from the pump.
FLUID SECTION DISASSEMBLY
1. Remove top manifold(s).
2. Remove (22) balls, (19) “O” rings (if applicable) and (21) seats.
3. Remove (15) fluid caps.
NOTE:Only PTFE diaphragm models use a primary (7) diaphragm and
a backup (8) diaphragm. Refer to the auxiliary view in figure 1.
4. Remove the (6) diaphragm washer, (7) or (7 / 8) diaphragms, (5)
backup washer and (196) cushion.
NOTE: Do not scratch or mar the surface of (1) diaphragm rod.
FLUID SECTION REASSEMBLY
SERVICENOTE: ARO pn 204214-T diaphragm assembly tool is recom-
mended for use when reassembling the pump.
SReassemble in reverse order.
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.)
SBecertain the diaphragm assembly bottoms out on the (1) rod, back
off PTFE diaphragm assembly far enough to align holes.
SFormodels with PTFE diaphragms: Item (8) Santoprene diaphragm
isinstalled with the side marked “AIR SIDE” towards the pump cen-
ter body. Install the (7) PTFE diaphragm with the side marked
“FLUID SIDE” towards the fluid cap.
SRe-checktorque settings after pump has been re-started and run a
while.
VitonRand Hytrel Rare trademarks of the DuPont Company SKynar Ris a registered trademark of Penwalt Corp.
SantopreneRis a registered trademark of Monsanto Company,licensed to Advanced Elastomer Systems, L.P. SLubriplate Ris a registered trademarkof Lubriplate Division (Fiske Brothers)