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SC-450 PreciseCoat C onformal C oating J et Maintenance and Service 22 © 2024 Nordson Corporation 5.4 Routine Maintenance Procedures Table 5-1 Routine M aintenance Proced ures Procedure Frequency Instructions Clean needl…

5 Maintenance and Service

5.1 Overview

Performing the recommended maintenance and service procedures at suggested intervals increases the

life of your SC-450 PreciseCoat Jet and ensures high quality coating performance for every production

run. This section contains the following procedures:

•

Recommended Facility

Items

•

Removing the

450

•

Routine Maintenance

Procedures

•

Replacing SC

450 Components

• Removal and Cleaning the Fluid

Needle

5.2 Safety First

Operation of your SC-450 PreciseCoat Jet involves air pressure, electrical power, mechanical devices,

and the use of hazardous materials, and sometimes may involve heat. It is essential that every person

servicing the coating system or components fully understands all hazards, risks, and safety precautions.

See Section 2 - Safety for additional information.

WARNING!

Allow only qualified personnel to perform the following tasks. Follow the safety

instructions in this document and all other related documentation.

WARNING!

Ensure the fluid system is completely depressurized prior to loosening any fittings

in the fluid path. Failure to do so may cause serious injury to personnel.

5.3 Recommended Facility Items

In addition to the supplied accessories and tools, it is recommended that the following items be available

at your facility:

• Personal Protective Equipment recommended in applicable SDS

• Bench Lamp and Magnifier Set

• Ultrasonic Cleaning System

• Air-gun and compressed, dry air

• Appropriate fluid collection and disposal container

• Solvent appropriate for the fluid used

• O-ring type lubricant

• Disposable towels, cleaning swabs and brushes

SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service

5.4 Routine Maintenance Procedures

Table 5-1 Routine Maintenance Procedures

Procedure Frequency Instructions

Clean needle As needed See 5.5 Removal and Cleaning the Fluid Needle.

Flush SC-450 with

appropriate solvent

Monthly

Refer to the applicable coating system Installation,

Operations, and Maintenance Manual.

Replace U-cup seal Monthly

Perform Step 4 in 5.7.1 Removing and Replacing the

Heater Assembly, Fluid Body, and Fluid Seal.

Clean and inspect the

valve

Every 6-12

months

1. Remove the PreciseCoat Jet from the mounting

bracket, see 5.6 Removing the SC-450.

2. Soak the shaft and body module in the solvent used

with the coating material.

3. Clean and dry the shaft and body.

4. Inspect the O-rings, U-cup seal, needle, and seat.

Replace parts that are damaged or worn. If you have

removed the U-cup seal, replace the U-cup seal with a

new one.

5.5 Removal and Cleaning the Fluid Needle

5.5.1 Cleaning and Replacing the Fluid Needle

NOTE

It is not necessary to remove the applicator from the coating system to replace or clean

the fluid needle.

To remove and clean the fluid needle (Figure 5-1):

1. Depressurize the applicator, see 5.6.1 Depressurizing the SC-450 and perform Step1

through Step 11.

2. Wipe the fluid residue from the fluid needle assembly.

WARNING!

Follow the Safety Data Sheet (SDS) recommendations for all fluids used with the

dispensing system. The SDS provides material usage instructions, disposal

instructions, and safety precautions.

3. Remove and separate the needle nut from the fluid body assembly by hand.

NOTE

Residual fluid may flow from the SC-450.

SC-450 PreciseCoat Conformal Coating Jet Maintenance and Service

4. Clean the fluid needle with the appropriate solvent depending on fluid used and inspect

thoroughly for damage before reusing.

WARNING!

Use an Nordson nozzle brush to scrub the needle. Do not use a steel brush or

any other type of brush that will damage the needle tip.

NOTE

If the fluid needle orifices are blocked, insert a probe or broach into the orifice against

the direction of fluid flow. If this problem persists, immerse the needle nut in an

appropriate solvent and use an ultrasonic cleaner.

5. Install the fluid needle, see 3.6 Installing the Fluid Needle.

Item Description

1 Assy, Fluid Body, SS (Item 16)

2 DL Needle Kit (Item 21)

3 Iwashita Needle Kit (Item 22)

Figure 5-1 Removing the Needle Assembly (all configurations shown)