MDE-4334C Atlas Start-up and Service Manual · April 2008
Page 7-53
Pumping Unit
Hydraulic/Mechanical Components
Servicing the Strainer Check Valve
Removing the Strainer (or Strainer/Check Valve)
Check valves (if equipped) are to be replaced only if the pumping unit is experiencing frequent
loss of prime, indicating that the check valve is not functioning. A check valve should be
installed when a tank check valve is not available. Always use a strainer with the pump.
Failure to use a strainer may cause premature pumping unit failure and may void warranty.
The strainer must be kept clean to ensure proper operation and to extend the life of the
pumping unit.
Figure 7-27: Strainer Check Valve
Side View
Rear View
Strainer Cover
Pump Shaft
Pump Vent
Pump Casing
Strainer or Strainer/
Check Valve
Bypass Valve
Gasket
Pressure
Control Valve
Allen Hex
To remove the strainer/strainer check valve, proceed as follows:
1
Lower the pumping unit fluid level by removing the plug located in the lower part of the
strainer cover. Remove the four hex nuts holding the cover in place.
Note: Removing the plug allows air to enter. See
.
2
Remove the strainer cover. Inspect the gasket for damage. If the gasket is damaged, discard the
gasket and replace it with a new gasket.