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4.5.2 CHECK VALVES REPLACEMENT: LIQUID END GM0002~GM0050-GM0050-STAINLESS STEEL
(SEE FIGURE 5-6 OR 5-11)
The metallic check valves used on liquid end sizes GM0002~GM0050 are precision assembled at the
factory. Do not attempt to disassemble these cartridges. If they become inoperative, ush them with
solvent, wash them with warm detergent and blow them out with compressed air to remove any foreign
matter. If this treatment does not eliminate the trouble, the cartridge assembly should be replaced.
Disassembly
Remove the check valves by unscrewing them from the pump head.
Reassembly
Apply a small amount of thread sealing compound and PTFE pipe tape to check valve threads and install check valves
by screwing them into the pump head with the ow arrows pointing up. DO NOT OVERTIGHTEN CHECK VALVES.
PUMP DAMAGE WILL OCCUR IF CHECK VALVES ARE INSTALLED UPSIDE DOWN. INSTALL
CHECK VALVES WITH THE FLOW ARROW POINTING IN THE DIRECTION OF PROCESS
FLOW (UP). TURN CHECK VALVE ASSEMBLIES INTO LIQUID END AND TIGHTEN BY HAND.
DO NOT OVERTIGHTEN, DAMAGE TO THE CHECK VALVES MAY OCCUR.
4.5.3 REPLACEMENT OF BALL, SEAT, & SEAL: LIQUID END GM0090~GM0500-PVC AND PVDF
(SEE FIGURE 5-14)
Disassembly
1. Unscrew the union nut (008). The union end (432) is held in place by the union nut and will separate
easily from the other liquid end parts.
2. Unscrew the check valve assembly from the pump head (370).
3. Screw the union nut part way (one or two turns) onto the end of the ball guide (003) that has the seat
in it. Be sure the union nut is on loosely. This will allow a gap for the seat (024) to fall into as it is
removed from the ball guide.
4. Set the ball guide/union nut on a at surface with the union nut down. Looking into the top of the ball
guide, you will see four large holes surrounding one small hole. Insert a thin, blunt instrument such as
a hex head screwdriver into the small center hole until it rests on the top of the ball (437).
5. Tap screwdriver gently with a hammer until the ball and seat are released from the ball guide.
IF THE UNIT IS DISASSEMBLED FOR INSPECTION ONLY, BE SURE TO USE A BLUNT
INSTRUMENT AND TAP GENTLY TO AVOID DAMAGING THE BALL. IF THE BALL AND/
OR SEAT ARE DAMAGED DURING DISASSEMBLY, THEY WILL HAVE TO BE REPLACED.
IF AVAILABLE, TO AVOID DAMAGE, IT IS ADVISABLE TO USE GENTLE AIR PRESSURE
(APPLIED AT END OPPOSITE THE SEAT (024) FOR BALL AND SEAT REMOVAL.
CAUTION
CAUTION
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