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NS20A & NS20N Heavy Duty Gun 

Page 9 

Revision 1.20 2/19/08 

 

MAINTENANCE INSTRUCTIONS 

Parts List 

751-535-000  751-535-100  751-535-500  751-693-000   

 

Item # 

Item # 

Item # 

Item # 

Description 

Part No. 

Qty. 

Required 

Gun Body 

751-535-002 

Front Cover 

751-535-006 

Rear Cover 

751-535-007 

Dust Seal Bellows 

751-535-008 

Plunge Dampener Assembly 

751-535-010 

Gun Coil 

716-041-000 

Main Spring 

526-001-191 

O Ring 

717-306-000 

Adjustable Core 

751-535-029 

10 

10 

10 

10 

Free Travel Adjustment Sleeve 

751-535-012 

11 

11 

11 

11 

Front Coil Yoke Sleeve 

751-535-013 

12 

12 

12 

12 

Front CoiI Yoke 

751-535-014 

13 

13 

13 

13 

Lifting Rod Assembly 

751-535-015 

*13a 

*13a 

*13a 

*13a 

Shaft Extension 

751-535-011 

14 

14 

14 

14 

Rear Coil Yoke 

751-535-030 

15 

15 

15 

15 

Threaded Hex Shaft Adaptor 

751-004-028 

16 

16 

16 

16 

Handle Cover 

751-535-034 

17 

17 

17 

17 

Cover Nut 

751-333-023 

18 

18 

18 

18 

Lifting Module Assembly 

751-535-025 

18a 

18a 

18a 

18a 

Lift Mech. Housing 

751-535-024 

18b 

18b 

18b 

18b 

Ring-Core Spring 

526-001-192 

18c 

18c 

18c 

18c 

Lifting Hook & Movable Core Assy 

751-535-026 

18d 

18d 

18d 

18d 

Lifting Ring 

751-535-022 

18e 

18e 

18e 

18e 

Lifting Mech. Stop 

751-535-023 

18f 

18f 

18f 

18f 

Retaining Springs 

717-881-003 

19 

19 

19 

19 

Front Bearing 

751-000-013 

20 

20 

20 

20 

Wave Washer 

717-844-001 

21 

21 

21 

21 

Cable Spacer 

751-004-007 

22 

22 

22 

22 

Wire Splice 

713-032-000 

23 

23 

23 

23 

Trigger Button 

751-148-016 

24 

24 

24 

24 

Trigger Switch Actuator 

751-535-038 

25 

25 

25 

25 

Cable Support Assembly 

751-535-032 

26a 

26a 

26a 

 

Weld Cable Asm. -Camlok 

720-075-000 

 

 

 

26b 

Weld Cable Asm. -Dinse 

720-543-000 

27a 

 

 

 

Control Cable Asm. - Cannon 4 Wire 

721-194-000 

 

27b 

 

 

Control Cable Asm. - R & S 3 Wire 

721-194-001 

 

 

27c 

27c 

Control Cable Asm. -Hubbell 

721-215-000 

28 

28 

28 

28 

Locking Ball 

751-000-051 

29a 

29a 

 

 

Trigger Switch Assembly 

709-028-100 

 

 

29b 

29b 

Trigger Switch Assembly 

709-028-200 

31 

31 

31 

31 

Chuck Adaptor 

751-004-029 

35 

35 

35 

35 

10-32 x 1/2 Binding Hd. Screw 

524-001-163 

36 

36 

36 

36 

10-32 x 3/8 Oval Hd. Screw 

524-001-215 

37 

37 

37 

37 

10-32 x 7/8 Oval Hd. Screw 

524-001-216 

38 

38 

38 

38 

8-32 x 1/4 Flat Pt. Soc. Set Screw 

524-002-005 

39 

39 

39 

39 

5/16-18 x 3/8 Flat Pt. Soc. Set Screw 

524-002-011 

* 13a is normally part of 13 but can be purchased separately. 

Summary of Contents for NS20A

Page 1: ...NS20A NS20N Heavy Duty Floating Lift Welding Guns Instruction and Maintenance Manual Version 1 30 December 2008 Manual Part Number 729 110 024 ...

Page 2: ...rded Nelson s personnel a reasonable opportunity to inspect and repair said equipment at buyer s facility or such other location as is mutually agreeable Notice to Nelson must be given within 30 days of such defect or failure and within ninety 90 days from the date the equipment was delivered No compensation or reimbursement for transportation costs of any kind will be allowed Please note that thi...

Page 3: ...djustment 2 Lift Adjustment 3 Nelweld Power Sources 3 Series 4800 Series 5000 TR 1600 4 Series 6000 TR 2400 4 Series 3000 NS 20A HD 5 WELD INSPECTION 6 Visual Inspection 6 Physical Inspection 6 SEQUENCE OF OPERATIONS 7 Exploded View 8 Parts List 9 MAINTENANCE INSTRUCTIONS 10 Part Number Designation 10 Disassembly of Gun 11 Examination and Cleaning of Gun Parts 12 Reassembly of Gun 12 Installing Ne...

Page 4: ...rrule Grip Leg Setscrews Leg Plunge 1 8 1 4 Figure 1 Gun assembly Plunge Adjustment 1 Adjust the leg and foot assembly so that the stud extends to beyond the end of the ferrule Figure 1 2 When plunge is adjusted tighten the leg screws so that the Foot Assembly cannot move Note It is necessary to adjust plunge when changing stud lengths Free Travel Adjustment With the free travel adjustment sleeve ...

Page 5: ... time if desired the gun will lift a second time without an arc being established The gun will stay lifted for a short time the default setting is two seconds refer to the Nelweld Manual for instructions on how to change this time if desired 3 Measure the inward movement of the shaft extension This is the actual lift that will occur under the welding condition Note Triggering the gun in the air aw...

Page 6: ...Replace rear cap on gun Adjust for proper weld time Recommended Lift Settings for Steel Studs For welding diameter studs or less 1 16 and diameter studs 3 32 Series 6000 TR 2400 1 Load stud and ferrule into gun with proper plunge setting for welding 2 Set weld time at approximately second 3 Place gun in normal welding position on a piece of wood or other insulated type surface 4 Depress trigger bu...

Page 7: ...se the gun to lift The lift in open air will be greater than when the gun is in the actual or simulated weld condition Caution Erratic lift can be caused by low voltage therefore it is suggested that a minimum of 65 volts open circuit voltage be used when checking lift or operating the stud welding equipment To Change Lift Remove rear cap on gun loosen lock screw and position the adjustable core a...

Page 8: ...ing spider legs Inadequate length reduction or burn off Fillet sits on top of the base material A hot weld made with too much time and or amperage is distinguished by Excessive spatter A washed out fillet Undercutting of the stud Burn through the base material Physical Inspection If after visually inspecting the welds a questionable weld is evident the weld should be physically tested Initial weld...

Page 9: ...d ring locks on the lifting rod and the movable core assembly lifts or pulls back the entire assembly including the chuck and stud Figure 6 6 When the stud is lifted from the work an arc is initiated 7 The assembly remains lifted for a preset weld time 8 At the end of this time period the gun coil 2 is de energized 9 The movable core assembly 3 is returned to normal position by the core spring 7 1...

Page 10: ...NS20A NS20N Heavy Duty Gun Page 8 Revision 1 20 2 19 08 MAINTENANCE INSTRUCTIONS Exploded View Figure 7 14 ...

Page 11: ... 526 001 192 1 18c 18c 18c 18c Lifting Hook Movable Core Assy 751 535 026 1 18d 18d 18d 18d Lifting Ring 751 535 022 1 18e 18e 18e 18e Lifting Mech Stop 751 535 023 1 18f 18f 18f 18f Retaining Springs 717 881 003 1 19 19 19 19 Front Bearing 751 000 013 1 20 20 20 20 Wave Washer 717 844 001 1 21 21 21 21 Cable Spacer 751 004 007 1 22 22 22 22 Wire Splice 713 032 000 4 23 23 23 23 Trigger Button 751...

Page 12: ...00 with 2 wire control Nelweld Power Sources with 2 wire Control Control Cable Description 6 pin 4 wire 4 pin 3 wire 3 Pin 2 Wire 3 Pin 2 Wire Control Cable Part Number 721 194 000 721 194 001 721 215 000 721 215 000 Control Connector Type Cannon R S Hubbell Hubbell Control Connector Part Number 714 083 002 714 061 000 714 174 000 714 174 000 Control Connector Boot N A N A 714 174 002 714 174 002 ...

Page 13: ...sembly 18 from the gun body 1 6 Remove screw 35 and rear cover 3 Loosen setscrew 38 and unscrew adjustable core 9 Do not unscrew loosen or remove rear coil yoke 14 or gun coil 6 7 Disassembly of the lifting module assembly 18 is not routinely required If further disassembly is necessary consult Figure 8 In order to disassemble the lifting module the internal retaining ring 18f must be removed from...

Page 14: ...nserting the hook through a window of the lifting ring 18d with the flat side of the ring towards the lifting hook and movable core assembly NOTE The lifting ring should be reinstalled rotated 180 from the position it was in when removed to distribute the wear evenly Insert the assembled lifting ring and lifting hook and movable core assembly into the lifting module housing 18a Place lifting modul...

Page 15: ... and green coil lead as close as possible to the wire splice 4 Remove cable spacer 21 from old control cable and install on new control cable 5 Connect new cable as follows Black lead to Red gun coil lead using splice 713 006 000 to one terminal on switch White lead to the other terminal on switch Green lead to green gun coil lead Note Connect green coil lead with insulated wire splice 22 or solde...

Page 16: ...support assembly 25 and remove cable 4 Install new cable into cable support assembly allowing 12 inches of cable to extend forward from the front face of the cable support to the centerline of the cable lug The end of the Neoprene tubing is to be flush with the cable support Reassemble the cable support 5 Install cable and cable support into gun handle Reinstall handle cover 16 and secure with scr...

Page 17: ...dard legs and foot plus cable loop to cable spud 7 lbs 8 oz Working Weight Includes standard legs and foot plus four 4 feet of cable from gun handle Note Four 4 foot length of cable is normally supported by the operator when in working position 10 lbs 8 oz Shipping Weight Includes standard legs and foot plus approximately 7 feet of cable with connectors normally supplied with gun 14 lbs 8 oz ...

Page 18: ...d hearing protection need Consult OSHA standard 29 CFR Part 1910 Subpart Q Welding Cutting and Brazing for additional information Protective Clothing The use of protective clothing is recommended The type of protection will vary with the stud welding process application weld position and stud size being welded but flame resistant clothing including high boots gloves apron leather leggings etc shou...

Page 19: ...emmes Avenue Richmond VA 23225 Phone 800 635 9353 San Francisco 23765 Foley Street Hayward CA 94545 Phone 510 293 0660 800 635 9353 Fax 510 293 0677 Seattle Export 406 26th Avenue Place Milton WA 98354 Phone 253 874 3524 Fax 253 874 5748 Tampa Export P O Box 3990 Seminole FL 33775 Phone 727 596 9600 Fax 727 593 3494 Tampa US 9401 Ayleshire Place Riverview FL 33569 Phone 800 635 9353 Toronto 6199A ...

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