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guide. The seats cannot easily be inspected for damage or wear. If you suspect that the check valve
may be damaged or worn, replace the entire check valve assembly as per the instructions below.
1. Unscrew the threaded connector.
2. Unscrew the check valve assembly from the liquid end.
Reassembly
THE ORDER OF ASSEMBLY AND ORIENTATION OF THE SUCTION AND DISCHARGE
CHECK VALVES IS DIFFERENT. REFER TO FIGURE 5-15 FOR PROPER ASSEMBLY ORDER
AND ORIENTATION. IF CHECK VALVE CARTRIDGES ARE INSTALLED INCORRECTLY, ONE
OF THE FOLLOWING WILL OCCUR:
(A). IMMEDIATE SEVERE DAMAGE TO PUMP MECHANISM
(B). NO PUMPING
(C). REVERSE PUMPING ACTION (FROM DISCHARGE LINE INTO SUCTION LINE)
1. Screw the correct end of the check valve assembly into the pump head, trapping a new O-ring
between the pump head and the check valve assembly.
DO NOT APPLY PTFE TAPE TO THREADS OF CHECK VALVE BODY AS THIS MAY PREVENT
ADEQUATE SQUEEZE FROM BEING APPLIED TO THE VALVE O-RING WHICH WOULD
RESULT IN LEAKAGE.
Note:
To assure a tight, leak free seal, new O-rings should be used each time the check valves
are disassembled.
2. Screw the threaded connector onto the check valve assembly, trapping a new O-ring (438) between
the coupling and the check valve assembly.
4.6 DIAPHRAGM AND OIL SEAL BELLOWS REPLACEMENT
BEFORE BEGINNING DIAPHRAGM REPLACEMENT, MAKE SURE THAT ALL SHUTOFF VALVES
ARE CLOSED AND ALL PRESSURE IS BLED FROM THE LIQUID END.
If failure of the oil seal bellows has occurred, it is recommended that the diaphragm assembly and oil seal
bellows be replaced at the same time.
4.6.1 DIAPHRAGM REPLACEMENT: LIQUID END SIZE GM0002~GM0050
(SEE FIGURES 5-3, 5-4, 5-6 AND 5-7)
1. Loosen the head screws (Item 103 in Figure 5-3 & 5-6) and remove the head (Item 370 in Figure 5-3
& 5-6). Mark the suction and discharge ports on the diaphragm head prior to removal.
CAUTION
CAUTION
CAUTION
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