Installation
Checking Relief Pressure at the Pump
28
Checking Relief Pressure at the Pump
Disconnect, lock out, and tag power at the panel before servicing the
pump.
When servicing equipment, use non-sparking tools and use caution when removing or in-
stalling equipment to avoid generating a spark.
Equipment required:
• Pressure gauge with appropriate fittings to connect to the 1/4’’ NPT line test port
Procedure:
1.
If a ball valve is installed down line from the pump, close it.
2.
Remove and save the protective plug over the service screw and turn the screw clockwise (see Figure 23). As
the screw approaches its bottom position, you will hear the system depressurizing. Continue turning the screw
until it can go no further. When the screw is all the way down, back off the screw 4 turns to lift the check valve
and let the fuel drain out of the manifold’s hydraulic cavities. Continue to turn the screw all the way
counterclockwise. When the screw is almost up, the check valve will drop down into position.
3.
Remove the line test port plug (see Figure 23) and attach test gauge.
4.
Open the air purge screw 2 - 3 turns counterclockwise (see Figure 23).
The air purge screw is retained by a hitch pin to limit travel. Do not attempt to rotate
beyond 3 turns.
5.
Turn the pump on and let it run for about 2 minutes to purge air from the manifold’s hydraulic cavities. While
the pump is still running, turn the air purge screw clockwise until it is completely closed.
6.
Turn off the pump and measure the relief pressure.
7.
Turn the service screw clockwise. As the screw approaches its bottom position, you will hear the system
depressurizing. Continue turning the screw until it can go no further. When the screw is all the way down, back
off the screw 4 turns to lift the check valve and let the fuel drain out of the manifold’s hydraulic cavities.
8.
Turn the service screw counterclockwise all the way up. As the screw nears its top position you will hear the
check valve drop into position. Replace the protective plug over the service screw and fully thread into place
to ensure a good seal.
9.
Remove the test gauge. Apply an adequate amount of fresh, UL classified for petroleum, non-setting thread
sealant on the 1/4’’ NPT plug and replace it in the line test port. Torque the plug to 14 to 21 ft-lbs (19.4 to 29
N•m).
10. Turn the air purge screw 2 - 3 turns counterclockwise.
The air purge screw is retained by a hitch pin to limit travel. Do not attempt to rotate
beyond 3 turns.
11. Turn the pump on and let it run for about 2 minutes to purge air from the manifold’s hydraulic cavities. While
the pump is still running, turn the air purge screw clockwise until it is completely closed.
12. The pump is now ready for normal operation.
13. If applicable, open ball valve down line from the pump.
OFF
WARNING
WARNING
WARNING
