Nordson_EFD_781RC_Operating_Manual.pdf - 第13页
Pump Maintenance and Cleaning (Fluid Side) 1. Disconnect electrical power from enclosure. 2. Remove tubing from pump fittings. 3. Remove pump from motor housing by removing the 3mounting screws. 4. Remove 3 long screws f…
Maintenance and Cleaning
General Cleaning
1. Remove fluid filled container and replace with new liner.
2. Pour appropriate solvent / cleaner into new liner. Increase pump
speed control setting and valve stroke to increase fluid flow.
Circulate solvent through system.
NOTE: Select channel 1 or 3 for nozzle air OFF operation during
initial cleaning cycle.
3. After a few minutes of circulation, place container under valve and
purge solvent from 781RC valve until tank runs nearly dry.
4. Repeat process with fresh solvent to clean system completely.
5. System should now be ready for next spray process.
Disposal of Discarded Wetted Materials
The user should consult local jurisdictional requirements for the proper
disposal of all discarded material.
Calibration Feature
The stroke control reference ring of each 781S-SS valve is factory
calibrated to the zero position. After cleaning, disassembly and
reassembly, the stroke control zero position may require recalibration.
To do so:
1. Make a note of the current stroke setting number.
2. Turn the calibration adjustment knob (inner) counterclockwise two
full turns.
3. Turn the stroke knob (outer) clockwise until it stops. Note reference
ring “0” (zero) location. If “0” is not positioned above either
reference mark on air cylinder body, rotate outer stroke knob
counterclockwise until “0” is positioned above preferred reference
mark. Select reference mark that is more clearly visible based on
valve mounting location.
4. Insert 1/8" hex allen wrench (included) into calibration adjustment
knob.
5. Turn the calibration adjustment knob clockwise until it stops. The
stroke adjustment is now calibrated to zero.
6. Reset stroke to the required position noted in step 1.
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781RC MicroMark Recirculating Spray Marking System
12 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Pump Maintenance and Cleaning (Fluid Side)
1. Disconnect electrical power from enclosure.
2. Remove tubing from pump fittings.
3. Remove pump from motor housing by removing the 3mounting
screws.
4. Remove 3 long screws from front of pump housing to
disassemble wetted components of pump.
5. Inspect PEEK gears and PTFE gaskets for wear / damage.
Replace as necessary using P/N 7014378* Pump Rebuild service
kit.
6. Clean any surfaces / orifices of fluid residues.
7. Reassemble in reverse order of disassembly.
*Includes PTFE gaskets, PEEK gears/SS shafts, and bushings.
Maintenance and Cleaning (continued)
781RC MicroMark Recirculating Spray Marking System
13www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Pump Cleaning (Motor Drive Side)
If cleaning of fluid side is insufficient to prevent binding of pump, then
disassemble drive side following these steps below:
1. Remove 3 small screws from rear of pump housing.
2. Remove mounting ring and drive housing.
3. Clean all wetted surfaces and reassemble.
4. Reattach pump to motor housing.
Valve Cleaning
Refer to 781S Series spray valve maintenance and parts guide for valve
disassembly and reassembly procedures.
Part Numbers
Part # Description
7013915 781RC-SS System, 0.36 mm (0.014") diameter nozzle
7013769 781RC-SS System 0.71 mm (0.028") diameter nozzle
781RC MicroMark Recirculating Spray Marking System
14 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.