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How to Remove & Replace Valve Stack on Neptune™ 560 Series Hydraulic Metering Pumps

by PSG | Oct 16, 2023

Designed to handle higher capacities in critical metering applications, the Neptune™ 560 Series Hydraulic Metering Pump represents our commitment to providing unique technologies that increase operational efficiency and performance while delivering peace-of-mind reliability.

As part of this commitment, the following step-by-step guide (part of our ProTip Series) is intended to help operators properly remove and replace the valve stack in their 560 Series Hydraulic Metering Pumps.

Step 1

Drain the oil from the gearbox from the drain plug and flush out any chemicals in the pump head.

Step 2
Remove the discharge cap by threading it off by hand, and then remove the vent cap from it by threading it off.

Step 3
Remove the ball retainer on the top valve with the Allen wrench.

Step 4
Use the special discharge valve tool and the Allen wrench, that is included with every 500 series pump, to loosen and remove the discharge valve. Note: Ensure the two notches on the special discharge tool are correctly secured onto the retainer.

Step 5
Remove the bottom valve with the Allen wrench.

Step 6
Remove the O-rings from the discharge and suction valves and the discharge and suction caps and replace them with the new valve cartridge and new O-rings.

Step 7
Replace the bottom valve using the Allen wrench to tighten it into place.

Step 8
Replace the bottom cap by threading it into place and then tightening it with a wrench.

Step 9
Replace the discharge valve by placing the ball retainer back and using the special discharge valve tool to tighten it into place. Note: Make sure the machined end is placed onto the ball and the side with the engraved T faces upwards.

Step 10
Finally, replace the discharge cap by threading it into place and tightening it with a wrench.

Each step of this process is essential to ensuring your pump valve is properly replaced so your pump can perform optimally. Please refer to your pump’s manual for any other specifications. Watch this instructive, step-by-step Maintenance Tips video to watch a Neptune product specialist demonstrate the valve stack replacement process.