SC_450 PreciseCoat Conformal Coating Jet_Rev_04.pdf - 第44页
SC-450 PreciseCoat C onformal C oating J et Maintenance and Service 38 © 2024 Nordson Corporation 4. Line up the needle with the seal (Figure 5-15A). 5. Slide the nee dle through the bea rings and slide the ins ertion to…
SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service
© 2024 Nordson Corporation 37
5.7.5 Replacing the Needle Shaft
To remove the needle shaft:
1. Remove the SC-450 from the coating system, see 5.6 Removing the SC-450.
2. Remove the needle assembly, see 5.5.1 Cleaning and Replacing the Fluid Needle.
3. Remove the heater assembly and fluid body, see 5.7.1 Removing and Replacing the Heater
Assembly, Fluid Body, and Fluid Seal.
4. Remove the stroke adjustment assembly, see 5.7.4 Replacing the Stroke Adjustment
Assembly.
5. From the bottom of the valve body, push the needle shaft through the valve and out the top
of the chamber.
To install the needle shaft:
?
NOTE
The needle insertion tool (Item 23) can be used to assist with needle replacement.
1. Apply a light coating of dry film paste lubricant (Item 23) to the shaft and seal of the nozzle
assembly.
2. Unscrew and separate the needle insertion tool base and pin (Figure 5-13).
3. Insert the needle flange into the insertion tool base (Figure 5-14).
> The needle flange should audibly snap into place when new. The flange should rest just
below flush with the edge of the base.
Figure 5-13
Unscrewing the Needle Assembly
Figure 5-14
Inserting the Needle Flange
Base
Pin
SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service
38 © 2024 Nordson Corporation
4. Line up the needle with the seal (Figure 5-15A).
5. Slide the needle through the bearings and slide the insertion tool base into the valve body.
6. Hand-tighten the base until it stops against the valve body.
7. Line up the installation pin with the hole in the top of the base (Figure 5-15A).
8. Push the pin all the way into the base (Figure 5-15B).
9. Remove the pin (Figure 5-15C).
10. Unscrew and remove the base from the valve body (Figure 5-15C).
Figure
5
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15
A
Figure
5
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15
B
Figure
5
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15
C
Figure
5
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15
Detaching the Needle from the Insertion Tool Base
SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service
© 2024 Nordson Corporation 39
11. Ensure that the flange is below the internal threads of the valve body (Figure 5-16).
Item Description
1 Internal Threads
2 Flange
Figure 5-16 Needle and Flange Fully Seated
12. Install the stroke adjustment assembly, see 5.7.4 Replacing the Stroke Adjustment
Assembly.
13. Install the heater insulation, see 5.7.2 Replacing Heater Insulation and Interconnect PCA.
14. Install the heater assembly and fluid body, see 5.7.1 Removing and Replacing the Heater
Assembly, Fluid Body, and Fluid Seal.
15. Install the fluid needle, see 3.6 Installing the Fluid Needle.
16. Install the SC-450 to the coating system, see 3.4 Installing the SC-450 PreciseCoat Jet.
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