NS20A & NS20N Heavy Duty Gun Page 13 Revision 1.20 2/19/08
MAINTENANCE INSTRUCTIONS
Installing New Control Cables -Welding Gun #751-535-000
1. Remove handle cover screws (36) and (37).
Lift off handle cover (16).
2. Lift out switch assembly (29).
3. Disconnect control cable wire (27a), cut red 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 one terminal on switch.
White lead to the other terminal on switch.
Green lead to green gun coil lead.
Red lead to red gun coil lead.
Note: Connect green coil lead with insulated wire
splice (22) or solder and tape coil lead to new
control cable lead.
6. Replace switch assembly (29a) after all
connections are made. Install cable into gun
handle. Reinstall handle cover (16) and secure
with screws (36) and (37).
Installing New Control Cables -Welding Gun #751-535-100
1. Remove handle cover screws (36) and (37).
Lift off handle cover (16).
2. Lift out switch assembly (29).
3. Disconnect control cable wire (27b), cut red
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 solder and tape coil lead to new
control cable lead.
6. Replace switch assembly (29a) after all
connections are made. Install cable into gun
handle. Reinstall handle cover (16) and secure
with screws (36) and (37).
Installing New Control Cables -Welding Gun #751-535-500 & #751-693-000
1. Remove handle cover screws (36) and (37).
Lift off handle cover (16).
2. Lift out switch assembly (29b).
3. Disconnect control cable wire (27c). Cut the
trigger 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 trigger lead to Black cable lead using
insulated splice (22).
White trigger lead to White cable lead using
insulated splice (22).
6. Replace switch assembly (29b) after all
connections are made. Install cable into gun
handle. Reinstall handle cover (16) and secure
with screws (36) and (37).
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