402M Flexible Impeller pumps are made of high quality bronze of maximum corrosion resistance, with shafts consisting of stainless steel grade 303. Top of the line models have ball bearings and mechanical seals while others have bronze or carbon bearings and lip type seals. Impeller material includes either neoprene rubber or nitrile rubber. Flexible blades on the periphery of the impeller provide the pumping action. While the impeller rotates the liquid between the blades is continuously squeezed out into the discharge port by a machined in cam located inside the pump chamber.
402M models are designed for Daytona Marine Engine using Chevrolet Blocks NO 327 and 427. Designed for American Marine LTD. Using John Deere Block NO JD6404 DR-15 and GMC Block Toroflow 63701893. Adaptable to other engines using these blocks.
Select proper belt size to match pulley groove as shown on dimension drawing on back. Belt must run sufficiently tight to prevent slippage. Do not over tighten. Pump will operate satisfactorily when mounted in any position. Special mounting holes are provided as part of extended cover casting.
Direction of shaft rotation determines inlet and outlet ports (see dimension drawing). Prior to installation, rotate the pump manually in direction of rotation to set flexible blades in direction desired.
Rubber impellers generate high rubbing friction unless lubricated by liquid being pumped. DO NOT RUN DRY. Lack of liquid will cause impeller to burn up.
The pulley is normally installed at the factory. If field service requires pulley removal and reinstallation, proceed as follows:
Pulley Removal: Loosen and remove the three three cap screws in the tapered steel bushing. Thread the three cap screws in the tapped removal holes, and progressively tighten each one until the aluminum pulley is loose on the tapered steel bushing. If the steel bushing won’t slip off the pump shaft, wedge screwdriver blade in saw cut to expand and overcome tightness.
Pulley Installation: Align the pulley groove with the belt centerline. Tighten the three bushing cap screws drawing the tapered steel bushing into the aluminum pulley and thereby tightening the steel bushing onto the pump shaft. Tighten the screws evenly and progressively. This insures an even draw down to eliminate pulley wobble. DO NOT tighten each screw independently. The ultimate maximum recommended torque is 75 inch-lbs.
Note: For two groove pulley, see 402M-06 (7562) - consult factory.
Liquids compatible with neoprene can be pumped including fresh and salt-water solution and mild chemicals. Do not pump severe solvents or acids. When possible, flush pump with fresh water after each usage.
Extremes of cold and heat will affect impeller life. Limits of 40°F to 180°F should be observed. Do not allow liquid in pump to freeze. Drain pump by loosening cover screws. Use methyl alcohol based anti-freeze compounds such as Zerex, Shell Zone, Pyro Permanent, Permagard, or Dowgard.
Suction lift of 15 feet is possible when impeller is wet. Suction lines must be air tight in order for pump to self-prime.