Pentair Plunger Pump 2359B-P

Check the oil level using the dipstick

Change the oil after 40 hours of break-in operation

Enter the amount of oil added (in fl. oz.)

Verify lubrication as marked on the crankcase

Fill a one or five-gallon container with water and time how long it takes to fill.

Is the water supply exceeding the required gallons per minute (gpm)?

Preventive Measures to Avoid Cavitation

Ensure the suction line is as large as possible, preferably the same size or larger than the inlet port.

Use high-capacity, clean line strainers.

Check the vacuum at the suction side. Ensure it does not exceed 2-3 inches of Hg.

Protect the pump from overheating by ensuring it is not exposed to direct sunlight and has adequate ventilation.

Ensure lubricating fluids are clean and at full levels.

Remove the valve cap (Figure 9, Ref. 1)

Remove the valve assembly (Ref. 3) from the head using needle nose pliers

Remove the o-ring (Ref. 4) from below the valve assembly

Remove the o-ring (Ref. 2) from the valve cap

Reassemble the parts by reversing the disassembly steps

Select the series of the valve cap for torque specification

Oil Seal Replacement 2200B-P and 2300B-P Series

Ensure the following tools are available

Drain the oil from the crankcase using a 9/16" hex wrench (Figure 1)

Remove the plunger retaining nuts with a 9/16" hex wrench

Remove the plungers and slinger rings (Figure 2)

Ensure the following tools are available

Replace the plunger seals if there is water leakage from the weephole

Use a 3/16" Allen wrench to remove the cylinder head bolts

Remove the head from the crankcase assembly

Rotate the shaft and remove the cup retainers from the plungers

Remove the cup retainer and the cup from the cylinder head