650718-C (en)
Page 3 of 8
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Loctite® is a registered trademark of Henkel Loctite Corporation
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ARO® is a registered trademark of Ingersoll-Rand Company
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262™, 271™ and 572™ are trademarks of Henkel Loctite Corporation
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Kynar® is a registered trademark of Arkema Inc.
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Viton® is a registered trademark of the DuPont Company
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Notice that the material inlet / outlet manifolds may be
removed and rotated 180° to facilitate various mounting
applications.
If the body of the pump must be rotated, remove the end
covers and manifolds and index it so the bolts line up
properly. NOTE: The arrow on the end caps must always
point upward for optimum performance.
When the diaphragm pump is used in a force-feed situa-
tion, it is recommended that a check valve be installed at
the air inlet to keep material out of air line in the event of
diaphragm failure.
Secure diaphragm pump legs to a suitable surface to in-
sure against damage by excessive vibration.
OPERATING INSTRUCTIONS
The pump should never be operated at pressures exceed-
ing 50 p.s.i.g. (345 kPa) inlet air pressure. This pump is
equipped with a pressure relief valve on the material out-
let manifold which will open at 40 +/-4 p.s.i. (2.76 bar) to
relieve pressure increases in the outlet hoses / plumbing
caused by thermal expansion or other external forces.
Disconnect the air supply from the pump if it is to be in-
active for a few hours.
MAINTENANCE
Refer to the part views and descriptions as provided on
pages 4 through 7 for parts identifi cation and service kit in-
formation.
Certain ARO “Smart Parts” are indicated which should be
available for fast repair and reduction of down time.
Service kits are available to service two separate
diaphragm pump functions: 1. AIR SECTION, 2. FLUID
SECTION. The Fluid Section is divided further to match
typical active Material Options.
Provide a clean work surface to protect sensitive internal
moving parts from contamination from dirt and foreign
matter during service disassembly and reassembly.
Keep good records of service activity and include the
pump in preventive maintenance program.
Before disassembling, empty captured material in the
outlet manifold by turning the pump upside down to
drain material from the pump.
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GENERAL DESCRIPTION
The ARO U.L. listed pump for pumping petroleum products,
offers high volume delivery even at low air pressures and
easy self-priming. This model is designed specifically for
transfer, bulk unloading or fueling applications. It includes a
pressure relief valve (per U.L. Specifi cation 79) which restricts
the fl uid outlet pressure to under 50 p.s.i. (3.4 bar). The relief
valve can be plumbed to return the bleed off fuel to the stor-
age container.
AIR AND LUBE REQUIREMENTS
WARNING
EXCESSIVE AIR PRESSURE. Can cause pump
and property damage. The air supply must be limited
to 50 p.s.i.g. (3.4 bar) maximum inlet air pressure.
The air supply line or hose to the pump should be ad-
equately sized to carry a sufficient volume of air to the
pump. The material inlet supply tubing should not be too
small or restrictive which will inhibit material flow. The
outlet material volume is governed not only by the air
supply but also by the material volume available at the
inlet.
Air supply provided should be filtered to provide clean
dry air. A filter capable of filtering out particles larger
than 50 microns should be used on the air supply. There
is no lubrication required other than the “O” ring lubricant
which is applied during assembly or repair.
If lubricated air is present, make sure that it is compatible
with the “O” rings and seals in the air motor section of the
pump.
INSTALLATION
IMPORTANT
Requirements for the installation are included in the
Flammable and Combustible Liquids Code, NFPA No. 30,
Automotive and Marine Service Station Code, NFPA No.
30A and the National Electric Code, ANSI / NFPA No. 70.
A fl uid return hose which is compatible with the fl uid be-
ing pumped must be installed to the relief valve on the
outlet manifold to return fl uid back to the supply tank or
pump inlet.
The pump must be grounded to prevent static discharge.
Grounding may be accomplished through the legs or to
the ground lug provided on the pump.
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