EFD 741V MAINTENANCE GUIDE

741V

MAINTENANCE & PARTS GUIDE

Electronic pdf files of EFD manuals are also available at

www.efd-inc.com/manuals.html.

IMPORTANT!

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Maintenance or

Tool Crib

Supervisors

A NORDSON COMPANY

For EFD sales and service in over 30 countries, contact EFD or go to www.efd-inc.com/contact

EFD, Inc.

East Providence, RI USA

800-556-3484; [phone] (outside the USA) [e-mail] www.efd-inc.com

EFD International Inc.

Dunstable, Bedfordshire, UK

0800 585733 or [phone] Ireland 00800 8272 9444

[e-mail] www.efd-inc.com

EFD, Inc., Asia
China: [phone]
[e-mail]	www.efd-inc.com/cn
Singapore: [phone]	[e-mail]

Valve Disassembly and

Reassembly Procedures

CAUTION: To prevent damage, the valve must be disassembled starting at the fluid outlet end of the valve.

Valve maintenance

To thoroughly clean fluid body and replace needle packings:

1.Remove needle stroke control knob and spring.

2.Remove inlet fitting and tip adapter/seat assembly.

3.Remove fluid body from air cylinder body, then remove O-ring.

4.Use extraction tool #7803 to remove needle packings from fluid body.

5.Remove any remaining packings and spring from needle.

6.Clean needle with cloth dampened in solvent, and lubricate with Nye Lubricant #865 included in the Maintenance Kit.

7.Replace O-ring and reassemble the valve in reverse order of disassembly.

Note: Ensure that the lower cylinder needle O-ring is back in place before reinstalling the packing spring.

Replacing piston and needle assembly or piston O-ring

8.Remove needle stroke control knob.

9.Remove piston return spring and thrust washers.

10.Remove the snap ring.

11.With small pliers on the spring pilot, pull the piston and needle assembly out of air cylinder. The piston and needle assembly is one unit and cannot be disassembled.

12.Clean air cylinder body wall and replace piston O-ring. Lubricate with Nye Lubricant #865 included in the Maintenance Kit.

2	17
	Tip adapter/
	seat assembly
	#7401

Fluid inlet fitting #7543BP for 1/4" OD (installed) #7610BP for 3/8" OD (supplied)

Packing spring #7808

packing assembly

Retaining washer #7807

collar #7403

3

#5148RV HW6-32X1

7

4

(Buna-N)

O-ring #7806

(Buna-N)

www.efd-inc.com [e-mail] USA 800-556-3484 Europe [phone] Asia [phone]

Sales and service of EFD® dispensing systems are available worldwide.