SC_450 PreciseCoat Conformal Coating Jet_Rev_04.pdf - 第37页
SC-450 PreciseCoat C onformal C oating J et Maintenance and Service © 2024 Nordson Corporation 31 4. Inspect th e U-cup seal in the flui d path on th e inside bottom of the fluid b ody assembly. > Do not remove th e U…
SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service
30 © 2024 Nordson Corporation
5.7 Replacing SC-450 Components
Tools and Materials Needed:
•
Metric Allen Wrench Set
•
Shipping Kit (
Item 23
)
•
Dry Film Paste
Lubricant (
Item 23
)
•
Torque Wrench (0
-
5
0 in
-
lbs)
5.7.1 Removing and Replacing the Heater Assembly, Fluid Body, and Fluid Seal
To remove the heater assembly:
1. Remove the needle assembly, see 5.5.1 Cleaning and Replacing the Fluid Needle and
perform Step 1 through Step 6.
2. Remove three (3) screws securing the heater assembly to the valve body assembly
(Figure 5-7).
?
NOTE
When the screws are removed from the valve body, the fluid body will be loose
and may separate.
3. Remove the heater assembly.
Item Description
1 U-Cup, VSPG, 2 LIP, PI-PTFE, 1/8 Rod (Items 19 and 23) (U-cup is inside)
2 Assy, Heater, 24W (Item 17)
3 Screw, M3 x 0.5 x 16, SHCS, SS (Items 18 and 23)
Figure 5-7 Replacing the Heater Assembly
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SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service
© 2024 Nordson Corporation 31
4. Inspect the U-cup seal in the fluid path on the inside bottom of the fluid body assembly.
> Do not remove the U-cup seal unless the U-cup seal is damaged or fluid leaks from the
body weep hole.
WARNING!
The U-cup seal may become damaged during removal causing fluid to leak from
the SC-450. Do not re-use the U-cup seal once it has been removed from the
SC-450.
a. If damaged, use the seal removal tool to remove the U-cup seal from the bottom of the
fluid body assembly.
b. Install a new U-cup seal by placing the U-cup seal on the end of the seal press tool
supplied in the shipping kit (with the side containing the spring facing outward)
(Figure 5-8).
Item Description
1 Seal Press Tool (Item 23)
2 U-Cup Seal (Items 19 and 23)
Figure 5-8 Utilizing the Seal Press Tool
c. Insert the seal press tool into the fluid body assembly (Figure 5-9).
d. Ensure the seal press tool is seated at the bottom of the chamber.
e. Push down on the seal press tool to seat the U-cup seal into the chamber.
> The U-cup seal should snap into place.
?
NOTE
When replacing the U-cup seal, it is recommended to cycle the SC-450 with solvent at
zero (0) psi fluid pressure for 10,000 cycles.
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SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service
32 © 2024 Nordson Corporation
f. Install the fluid body assembly into the heater insulation, see 5.7.1 Removing and
Replacing the Heater Assembly, Fluid Body, and Fluid Seal.
Item Description
1 Seal Press Tool (Item 23)
2 U-Cup Seal (Items 19 and 23)
3 Assy, Fluid Body, SS (Item 16)
Figure 5-9 Seating the U-Cup Seal
To install the heater assembly (Figure 5-7):
1. Inspect heater contact pads.
> Should be clean and free of any debris or coating material.
2. Slide heater assembly onto fluid body and up to valve.
3. Install three (3) screws securing the heater assembly to the valve body assembly.
4. Torque the three (3) screws to 1.35 Nm (12 in-lbs).
5. Install the fluid needle, see 3.6 Installing the Fluid Needle.
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