User guide

Maintenance and Service 29

To remove the needle and disassemble the air piston:

1. Using the module-adjusting wrench to hold the top of the seal lock-nut and another module-

adjusting wrench to loosen the spring retainer, carefully remove the spring retainer and seal

lock-nut (Figure 5-4).

2. Carefully remove the needle by pushing it out of the upper body.

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NOTE During needle removal, check if the U-cup seal rotates in the upper body. Any play

indicates a need for air piston replacement. Replace it also if air or fluid leaked from

the upper body weep-hole during dispensing.

3. Carefully remove the air piston, seal lock-nut, and O-ring from the needle.

4. Carefully separate the air piston, seal lock-nut, and O-ring.

5. Set aside removed parts for inspection and cleaning.

Item Description Item Description

1 Air Piston (shown assembled) 5 Seal Lock-nut

2 Needle 6 O-ring

3 U-cup Seal 7 Air Piston

4 Spring Retainer 8 Upper Body

Figure 5-4 Removing the Needle and Disassembling the Air Piston