Use and Care Manual

66607X-X-A (en) Page 3 of 8
GENERAL DESCRIPTION
The ARO diaphragm pump offers high volume delivery
even at low air pressure and a broad range of material
compatibility options available. Refer to the model and
option chart. ARO pumps feature stall resistant design,
modular air motor / fluid sections. Air operated double
diaphragm pumps utilize a pressure differential in the air
chambers to alternately create suction and positive uid pres-
sure in the uid chambers, valve checks ensure a positive ow
of uid. Pump cycling will begin as air pressure is applied and
it will continue to pump and keep up with the demand. It will
build and maintain line pressure and will stop cycling once
maximum line pressure is reached (dispensing device closed)
and will resume pumping as needed.
AIR AND LUBE REQUIREMENTS
WARNING
EXCESSIVE AIR PRESSURE. Can cause
personal
injury, pump damage or property damage.
y
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.
y
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.
OPERATING INSTRUCTIONS
y
Always flush the pump with a solvent compatible with
the material being pumped if the material being pumped
is subject to “setting up” when not in use for a period of
time.
y
Disconnect the air supply from the pump if it is to be
inactive for a few hours.
y
The outlet material volume is governed not only by the
air supply, but also by the material supply available at the
inlet. The material supply tubing should not be too small
or restrictive. Be sure not to use hose which might co
lapse.
y
When the diaphragm pump is used in a forced-feed
(ooded inlet) situation, it is recommended that a “Check
Valve” be installed at the air inlet.
y
Secure the diaphragm pump legs to a suitable surface to
ensure against damage by vibration.
MAINTENANCE
Refer to the part views and descriptions as provided on pages
4 through 7 for parts identication and service kit information.
y
Certain ARO “Smart Parts” are indicated which should be
available for fast repair and reduction of down time.
y
Service kits are divided to service two separate diaphragm
pump functions: 1. AIR SECTION, 2. FLUID SECTION. The
FLUID SECTION is divided further to match typical part
MATERIAL OPTIONS.
y
Provide a clean work surface to protect sensitive internal
moving parts from contamination from dirt and foreign
matter during service disassembly and reassembly.
y
Keep good records of service activity and include pump
in preventive maintenance program.
y
Before disassembling, empty captured material in the
outlet manifold 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 and (21) seats.
3. Remove (15) uid caps.
NOTE: Only PTFE diaphragm models use a primary dia-
phragm (7) and a backup diaphragm (8). Refer to the auxiliary
view in the Fluid Section Illustration.
FLUID SECTION REASSEMBLY
y
Reassemble in reverse order.
y
Clean and inspect all parts. Replace worn or damaged
parts with new parts as required.
y
Lubricate (1) diaphragm rod and (2) “O” ring with
Key-Lube “O” ring lube.
y
Install (2) “O” ring on (1) diaphragm rod.
y
Be certain (7) or (7 / 8) diaphragm(s) align properly with
(15) uid caps before making nal torque adjustments on
bolt and nuts to avoid twisting the diaphragm.
y
For models with PTFE diaphragms: Item (8) Santoprene
diaphragm is installed with the side marked “AIR SIDE”
towards the pump center body. Install the PTFE
diaphragm with the side marked “FLUID SIDE” towards the
uid cap.
y
Re-check torque settings after pump has been re-started
and run a while.
Viton
®
and Hytrel
®
are registered trademarks of the DuPont
®
Company. Kynar
®
is a registered trademark of Penwell Corp
Santoprene
®
is a registered trademark of Monsanto Company, licensed to Advanced Elastomer Systems, L.P. Key-Lube
®
is a registered trademark of Key Industries