Nordson-EFD-741MD-Maintenance-Guide.pdf
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™
Electronic pdf files of Nordson EFD
manuals are also available at
www.nordsonefd.com
IMPORTANT!
Save this Sheet.
Forward to
Maintenance or
Tool Crib Supervisors
741MD-SS Needle Valve
Maintenance & Parts Guide
741MD-SS Needle Valve | Maintenance & Parts Guide
2 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Valve Disassembly and
Reassembly Procedures
To prevent damage, the valve must be disassembled
starting at the fluid outlet end of the valve.
CAUTION
Valve Maintenance
To thoroughly clean the fluid body and replace needle
packings:
1. Remove the inlet fitting and tip adapter.
2. Remove the fluid body from the air cylinder body,
then remove the O‑ring.
3. Use tool #7021552 to remove the needle
packings from the fluid body.
4. Remove any remaining packings and remove the
spring from the needle.
5. Clean the needle with a cloth dampened in
solvent and lubricate with the Nye Lubricant
#865 gel included in the General Maintenance
Kit. Lubricate and reinstall the needle packing
assembly.
6. Install the new, lubricated O‑ring on the fluid
body. Then install the chamber in the air cylinder
body.
7. Turn the fluid body to position the fluid inlet
hole in the desired location. Install and tighten
the fluid body mounting screws (2). Torque to
1.58N•m (14in‑lb).
8. Reinstall the tip adapter / seat assembly.
Retaining nut only
#7021194
Inlet fitting
#7021867
Needle packing assembly
#7007014
Tip adapter with
retaining nut #7021227
(2) Body mounting
screws #7023632
O‑ring
#7018502
(Buna‑N)
Fluid body
#7021252 (stainless steel)
Nye gel lubricant, 1 gram
foil packet (not shown)
#7014917
Packing spring
#7014683
1
2
7
6
3
O‑ring #7014718
O‑ring #7014684
Retaining
washer
#7014685
741MD-SS Needle Valve | Maintenance & Parts Guide
3www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Maintenance Tools:
6" adjustable wrench
Snap‑ring pliers
Packing extraction tool #7021552
Air cylinder body
#7021245
Piston‑and‑needle
assembly #7007008
Air input hose #7007036
Piston
return spring
#7014682
9
5
11
10
12
Replacing the Piston and Needle
Assembly or Piston O‑Ring
9. Remove the needle stroke control knob.
10. Remove the piston return spring and thrust
washers.
11. Remove the snap ring.
12. With small pliers on the spring pilot, pull the
piston‑and‑needle assembly out of the air
cylinder body. The piston‑and‑needle assembly
is one unit and cannot be disassembled.
13. Clean the air cylinder body wall and replace the
piston O‑ring. Lubricate with the Nye Lubricant
#865 gel included in the General Maintenance
Kit.
14. Reassemble the valve in the reverse order of
disassembly.
NOTE: Ensure that the lower cylinder needle
O‑ring is back in place before reinstalling the
packing spring.
Stroke calibration knob
#7021267
Snap ring
#7014757
Thrust washer
#7014862
O‑ring
#7014687
13
General Maintenance Kit
#7007030
Includes all O‑rings, needle packing
set, and foil pack of Nye Lubricant
#865 gel.
Valve Disassembly and
Reassembly Procedures
(continued)
O‑ring #7014686
Part # Description
7021233
741MD‑SS Valve