Service and Repair
Replacing the Check Valve Assembly
33
Replacing the Check Valve Assembly
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 installing
equipment to avoid generating a spark.
Close the ball valve in the discharge line if it has been installed.
Care should be taken to ensure that the internal portions of the vent line and check
valve assembly are clean and free of debris or contamination during servicing.
1.
Relieve system pressure by removing the protective cover and then backing out the pressure adjustment
screw (see Figure 21).
2.
Disassembly
a.
Loosen or disconnect the lower vent line fitting.
b.
Disconnect the upper vent line fitting.
c.
Remove the four 1/2 inch hex bolts.
d.
Pull the check valve housing assembly straight out of the manifold.
Figure 21. Maxxum Check Valve Assembly
OFF
WARNING
WARNING
rj/051-301-23.eps
1/2-13 Hex bolt
O-ring
Check valve
Vent line
Thread
protector
Pressure
adjustment
screw
Protective
cover
