EFD 741V MAINTENANCE GUIDE

741V

MAINTENANCE & PARTS GUIDE

IMPORTANT!

Save this Sheet.

Forward to

Maintenance or

Tool Crib

Supervisors

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]

Electronic pdf files of EFD manuals are also available at
www.efd-inc.com/manuals.html.

A NORDSON COMPANY

O-ring

(Buna-N)

#7806

Retaining
washer
#7807

Packing spring
#7808

Needle packing assembly
#7810

O-ring (Buna-N)

#4049

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

Screws
HW6-32X1

Fluid body
#7430-SS (stainless

steel)

#7430 (hard-coated aluminum)

Tip adapter/
seat assembly
#7401

O-ring
(Viton)
#5148RV

SafetyLok

™

collar
#7403

2

3

4

7

16

17

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.

Valve Disassembly and
Reassembly Procedures

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

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

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