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4. Remove lower front access panel and left-side panel as instructed for access to the water pump water
strainer screen.
5. Pull up on carbonator tank relief valve plastic cover to release CO
2
pressure from tank.
6. Loosen screen retainer in water pump port, then remove screen retainer and strainer screen from port.
7. Pull strainer screen from screen retainer. Clean any sediment from screen retainer and water pump port.
8. Inspect strainer screen for holes, restrictions, corrosion, and other damage. Discard damaged strainer
screen.
9. Check O-ring on screen retainer. Replace worn or damaged O-ring (P/N 315349000).
NOTE: Strainer screen should always be used otherwise particles could foul double liquid check valve.
10. Install good or new strainer screen (P/N 315348000) in screen retainer, then screw retainer into water
pump port and tighten securely.
11. Proceed to SERVICING CARBONATOR WATER PUMP DOUBLE LIQUID CHECK VALVE.
SERVICING CARBONATOR WATER PUMP DOUBLE LIQUID CHECK VALVE
(see Figures 2 and 12)
1. Service water pump water strainer screen before servicing water pump double liquid check valve.
2. Disconnect carbonator tank water line from double liquid check valve assembly outlet.
3. Remove double liquid check valve assembly from elbow in water pump outlet port. Retain white tapered
gasket inside inlet (female) end of double liquid check valve.
4. Disassemble each check valve as shown in Figure 11.
5. Wipe each part with clean lint-free cloth. Inspect each part, especially ball for burrs, nicks, corrosion,
deterioration, and other damage. Discard ball seat and any damaged or suspicious parts and replace with
new parts during reassemble.
6. Reassemble liquid check valves as shown in Figure 11. ALWAYS INSTALL NEW BALL SEAT (QUAD
RING) P/N 312418000.
NOTE: Make sure when assembling check valves together, check valve female end with white tapered
gasket inside is on inlet side of double liquid check valve assembly.
7. Assemble check valves together. DO NO OVERTIGHTEN.
8. Make sure white tapered gasket is in place inside female end of double liquid check valve assembly, then
install check valve assembly on elbow in water pump outlet port.
9. Connect carbonator tank water line to double liquid check valve assembly outlet. DO NOT
OVERTIGHTEN.
10. Open CO
2
cylinder and water inlet supply lines shutoff valves. Check for water leaks and tighten any loose
connections.
11. Install Unit back panel by reversing removal procedure.
12. Connect electrical power to Unit.
13. Press both ‘‘AUTO BLEND 1’’ and ‘‘AUTO BLEND 2’’ switches.
14. Press both ‘‘AUTO 1’’ and ‘‘AUTO 2’’ switches to start freeze cylinders beaters and refrigeration system.