GENERAL DESCRIPTION |
| MAINTENANCE |
The ARO diaphragm pump offers high volume delivery even at low air pressure and a broad range of material compatibil- ity options are 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 dif- ferential in the air chambers to alternately create suction and a positive fluid pressure in the fluid chambers, valve checks insure a positive flow of fluid.
Pump cycling will begin as air pressure is applied and will continue to pump and keep up with the demand. It will build and maintain line pressure and will stop cycling once maxi- mum line pressure is reached (dispensing 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.
yA filter capable of filtering out particles larger than 50 microns should be used on the air supply. There is no lu- brication required other than the “O” ring lubricant which is applied during assembly or repair.
yIf 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
yAlways 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.
yDisconnect the air supply from the pump if it is to be in- active for a few hours.
yThe 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 col- lapse.
yWhen the diaphragm pump is used in a
ySecure the diaphragm pump legs to a suitable surface to insure against damage by vibration.
Refer to the part views and descriptions as provided on pages 4 through 7 for parts identification and service kit in- formation.
yCertain ARO “Smart Parts” are indicated which should be available for fast repair and reduction of down time.
yService kits are divided to service two separate dia- phragm pump functions: 1. AIR SECTION, 2. FLUID SEC- TION. The Fluid Section is divided further to match typical part Material Options.
yProvide a clean work surface to protect sensitive internal moving parts from contamination from dirt and foreign matter during service disassembly and reassembly.
yKeep good records of service activity and include the pump in preventive maintenance program.
yBefore 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 (61) outlet manifold and (60) inlet manifold.
2.Remove (22) balls, (19) “O” rings, (21) seats and (76) seat plugs.
3.Remove (15 and 15a) fluid caps.
4.Remove the (14) cap screw, (6) diaphragm washer, (7) dia- phragm, (5) backup washer and (196) cushion.
NOTE: Do not scratch or mar the surface of (1) diaphragm rod.
FLUID SECTION REASSEMBLY
SERVICE NOTE: ARO pn
yReassemble in reverse order. Refer to the torque require- ments on page 5.
yClean and inspect all parts. Replace worn or damaged parts with new parts as required.
yLubricate (1) diaphragm rod and (144) “U” cups with Lu- briplate®
yApply 1/4” wide x 1/8” thick (approximately 46” long) expandable PTFE Joint Sealant to air cap (item 68 only) diaphragm bead groove. Use ONLY 1 wrap of sealant. DO NOT overlap seam. Fill seam with heavy duty anearobic sealant. Seam to be located between bolt positions 1 and 3 (refer to “Torque Sequence” diagram, page 5).
y
y Hytrel® and Viton® are registered trademarks of the DuPont Company y Loctite® and 242® are registered trademarks of Henkel Loctite Corporation y
y Santoprene® is a registered trademark of Monsanto Company, licensed to Advanced Elastomer Systems, L.P. y ARO® is a registered trademark of
y Lubriplate® is a registered trademark of Lubriplate Division (Fiske Brothers Refining Company) y 271™ is a trademark of Henkel Loctite Corporation y
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