Manual

30 Maintenance and Service
To remove the Needle and disassemble the Air Piston:
1. Use 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.
2. Carefully remove the needle by pushing it out of the upper body.
3. Carefully remove the air piston, seal lock nut, and o-ring assembly from the needle.
4. Carefully separate the air piston, seal lock nut, and o-ring.
5. Set aside removed parts for inspection and cleaning.
To remove the Co-axial Air Solenoid Valve:
1. Disconnect the co-axial air tubing from the co-axial air nozzle nut, the co-axial air valve electrical
cable connector, and the blue air line from the dispensing system.
2. Remove the two co-axial air solenoid bracket mounting screws from the bottom of the Z-head
mounting plate.
3. Set aside part for cleaning and inspection.
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
8
2
1
4
5
7
3
6