Laserfiche WebLink
Aft <br />Service and Repair Repairing the Check Valve Lockdown Screw and Seals <br />3. Assembly <br />a. Be certain the two o -rings on the sealing face of the check valve housing are in place. <br />b. Lower the check valve assembly back down into the manifold taking care not to damage the rubber seal <br />on the check valve assembly. <br />c. Install the four 1/2 inch bolts. Torque these bolts to 50 ft -lbs (68 N -m). <br />d. Remove and discard the thread protector. <br />e. Re -attach the upper vent fitting then tighten both the upper and lower fittingsl /6 to 1/4 turn beyond hand <br />tight. <br />4. Readjust the pressure adjustment screw to the desired pressure setting. <br />5. Replace the protective cover. <br />6. if applicable, open ball valve down line from the pump. <br />Repairing the Check Valve Lock -down Screw <br />WARNING! Disconnect, lock out, and tag power atthe panel before servicing the pump. <br />�& 0 <br />When servicing equipment, use non -sparking tools and use caution when removing or installing <br />equipment to avoid generating a spark. <br />NOTE: Care should be taken to ensure that the internal portions of the check valve housing are clean and free of <br />debris or contamination during servicing. <br />1. Close the ball valve in the discharge line if it has been installed. <br />2. Lock down screw removal (see Figure 24). <br />a. Remove the four wiper housing retaining screws. <br />b. Lift off the wiper housing from the lock -down screw. <br />c. Remove the wiper from the wiper housing. Avoid damaging the bores in the housing, <br />d. Unscrew the lock -down screw and remove it from the check valve housing. <br />3. Lock -down screw reinstallation. <br />a. Replace the two o -rings on the lock -down screw. These o -rings should be installed from the non -threaded <br />end of the lock -down screw so as to avoid nicking or damaging the o -rings. <br />b. Sparingly lubricate the two o -rings before screwing the lock -down screw into the check valve housing. <br />Use light grease, oil, or petroleum jelly. <br />c. Using a flat piece of metal at least 1/2 inch larger than the OD of the wiper, carefully drive the new wiper <br />into the wiper housing, orienting the wiper as shown in Figure 24. <br />d. Sparingly lubricate the wiper ID lip before sliding it over the lock -down screw onto the check valve <br />housing. Use light grease, oil, or petroleum jelly. <br />e. Re -install the four #6 wiper housing retaining screws and torque to'20 in -lb (2.23 N -m). f <br />4. if applicable, open the ball valve in the discharge line if it has been installed. <br />t t <br />32 <br />