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MODELS 4490, 4491, 4492 3.5:1 AIR OPERATED PUMPS SERIES “A” SINGLE ACTION FLUID PUMP Model 4492 (Stub Pump) Model 4491 (250-275 Gal) Model 4490 (16-55 Gal) Model A52347R-248 (250-275 APRIL - 2005 Page Form 402002 Section...
Operate the pump only after safety IMPORTANT: The pump will not operate without a foot valve. instructions and this operation manual is fully Contact Lincoln Technical Services for any modifications to the understood. pump tube. Adequate personal protection is recommended to prevent APPROPRIATE USE splashing of material on the skin or in the eyes.
Lincoln recommends using a mini regulator #602003 (1/4” NPT port size) with an air pressure gage #247843 in the air supply line to the pump to regulate the air pressure to the pump.
A 1” NPT female pipe thread is provided at the pump base for connection with alternate pump tube configurations. Lincoln #85949 Universal Suction Kit includes a suction tube that may be cut to fit. A foot valve is also included with the kit.
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MODELS 4490, 4491, 4492 3.5:1 AIR OPERATED PUMP Model 4492 Stub Pump Illustration #2 Page Number - 5 Form 402002...
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MODELS 4490, 4491, 4492 3.5:1 AIR OPERATED PUMP Model 4490 Model 4491 16-55 Gallon 250-275 Gallon Illustration 3 Illustration 3 Page Number - 6 Form 402002...
Illus. 6 indicates how all components fit seated when reinstalled. together and the correct placement of seals. Contact your nearest authorized Lincoln Service Dealer or Contact your nearest authorized Lincoln Service Dealer or Lincoln Technical Services for assistance.
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MODELS 4490, 4491, 4492 3.5:1 AIR OPERATED PUMP Illustration #5 Page Number - 8 Form 402002...
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MODELS 4490, 4491, 4492 3.5:1 AIR OPERATED PUMP Illustration #6 Page Number - 9 Form 402002...
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MODELS 4490, 4491, 4492 3.5:1 AIR OPERATED PUMP SERVICE PARTS PART NO ITEM DESCRIPTION QUAN 274095 1/4-28 X 3/4” SOC HD CAP SCREW 274079 FLUID CYLINDER O-RING, FLUID CYL. (NITRILE) SEAL, PISTON (NITRILE) 274107 O-RING, PISTON CHECK (NITRILE) 12 U-CUP, ROD SEAL (POLYURETHANE) 20 SEAL, AIR PISTON (POLYURETHANE) 274078 NUT, FLUID PISTON...
MODELS 4490, 4491, 4492 3.5:1 AIR OPERATED PUMP TROUBLESHOOTING Conditions Possible cause Corrective action The pump doesn’t operate. No inlet air pressure. Connect air supply. The piston is stuck. Disassemble the pump inspect for damage, relubricate. Replace if necessary. Air pressure is too low. Check air pressure supply. The pressure is to be higher than 20 Psig.