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The Johnson Cartridge Pump uses remarkably little electricity for the amount of water it pumps. The improved, efficient motor also provides increased service life, thanks in part to an ingenious solution which circulates the discharge water around the motor for cooling.
The improved design of the 500 GPH cartridge pump includes easy-to-install Dura-Port discharge ports to eliminate stress cracking caused by over-tightened hose clamps. This pump comes with both a straight and a 90° smooth elbow Dura-Port as well as a removable check valve.
Johnson 500 GPH Cartridge Bilge Pump Specs
• Capacity 3' Head: 525 GPH (8.72 gal/min)
• Capacity Straight: 630 GPH (10.57 gal/min)
• Amperage: 2.5 A
• Fuse Size: 5 A
• Connection: 3/4"
• Max Dia.: 2.75"
• Max Height: 4.4"
• Weight: 9.6 oz.
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Q:I just installed the Johnson 500 gph pump and float switch. It is plumbed with 3/4 inch I.D. rubber hose. It has to raise the water about 15" over the transom. The pump keeps air locking. I have to loosen the fitting at the pump to let the air bubbles out then it works.
Whats the fix?Asked on 6/22/2015 by MTYDG from Wisconsin
The output hose should be a continuous and gradual rise to the thru-hull. There should be no dips in the hose which could cause a vapor lock. The pump is self priming as long as there is adequate water around the pump (approx ½"). It will only pull down to approx 1/4 " and will start to cavitate, which is what you are describing. You can look at the strainer and see the height of the grooves which is lowest level it will pull from as long as ALL the strainer grooves are under the water level. You may want to relocate the float switch so that it is SLIGHTLY higher in the bilge to allow the pump activate at a higher bilge water level. Pull the cartridge and inspect to make sure there is no debris in the strainer housing. Inspect the pump housing and hose outlet barb for any surface cracks that could be allowing air into the system. Make sure the check valve is in proper orientation. It will look much like a duck bill. The tapered end should be towards the direction of the flow. Remember to remove the larger gasket if using the check valve. The molded flange for the check valve replaces the gasket.
SteveAnswered on 6/23/2015 by Anonymous
Q:What is the maximum pressure that this pump can produce?Asked on 9/9/2014 by Lou from Ottawa
The manufacturer does not give the maximum pressure of the Johnson 500 GPH Bilge Pump. They do indicate that the pump is strong enough to lift the water from the bilge up to 3 feet above the pump.
SteveAnswered on 9/9/2014 by Anonymous
Q:Do you have Johnson Pump Cartridge Model number 28552? If so, cost, delivered.
Thanks, Bob CassedayAsked on 4/9/2012 by Bob from Palo Pinto, TX
Q:How long are the electrical leads wires on this pump?Asked on 11/24/2010 by Speck Detector from Oviedo, FL.
Q:This pump looks similar to the one on my 1998 Bayliner 2050SE Capri. The pump on my Capri is red and named "Johnson Pump". It is a 500GPH pump with a very similar profile. Is the Mayfair a replacement pump?Asked on 5/31/2009 by Joe from Everett WA
A:This would be an upgrade from your 500gph pump as this on is a 720gph, and would require complete replacement.Answered on 2/15/2011 by Justin from Overton's
Q:WILL THIS BILGE PUMP REPLACE MY ORIGINAL 1986 MASTERCRAFT MAYFAIR JETTISON MODEL 1225 BILGE PUMP. IF YOU HAVE ANOTHER BILGE PUMP THAT IS MORE COMPATIBLE AS A REPLACEMENT I WOULD PREFER TO PURCHASE THE MORE COMPATIBLE PUMP.Asked on 5/9/2009 by MICHAEL from HADLEY, NEW YORK
A:I do apologize but we do not have a direct replacement for your current bilge pump. This pump will work but you might have to drill new holes.Answered on 2/15/2011 by Toby from Overtons Tech. Dept.