Lincoln Electric LF-72/74 Manuals

Lincoln Electric LF-72/74 Manuals

Manuals and User Guides for Lincoln Electric LF-72/74. We have 1 Lincoln Electric LF-72/74 manual available for free PDF download: Service Manual

Lincoln Electric LF-72/74 Service Manual

Lincoln Electric LF-72/74 Service Manual (119 pages)

Lincoln Electric Welder User Manual

Brand: Lincoln Electric | Category: Welding System | Size: 6.38 MB

Table of Contents

Table of Contents

7
- Service Manual
  1
- California Proposition 65 Warnings
  2
- Electric Shock Can Kill
  3
- Installation
  8
  - Technical Specifications
    8
  - Safety Precautions
    9
    
    Location
    9
    
    Mounting
    9
    
    Bench Mount
    10
    
    Swivel Mount
    10
    
    Boom Mount
    10
    
    Suspended
    10
    
    Weld Cable Sizes
    11
    
    Coaxial Weld Cables
    12
    
    Weld Cable Connections
    12
  - Analog Control Cable Connections
    13
    
    Welding Gun/Wire Feeder Trigger Connector
    15
    
    High Frequency Protection
    15
    
    Remote Sense Lead Specifications
    15
  - Wire Drive Systems
    15
  - Welding Guns, Torches and Accesories
    16
  - Procedure for Changing Drive and Idle Roll Sets
    17
    
    Wire Drive Configuration
    17
    
    Pressure Arm Adjustment
    18
    
    Wire Reel Loading
    19
    
    Weld Wire Routing
    20
  - Installing Electrode Conduit Kits
    22
  - Aluminum Wire Preperations
    23
  - Typical System Configurations
    25
Operation Section

27
- Operation
  28
  - Safety Precautions
    28
  - Graphic Symbols
    28
  - Common Welding Abbreviations
    29
  - Product Description
    29
  - Front Panel Controls and Connections
    30
    
    Remote Voltage Control Kit (Optional
    31
    
    Burnback and Postflow Timer Kit (Optional
    31
    
    Thermal LED, Motor Overload
    31
    
    Cold Feed/Gas Purge Switch
    31
    
    5. 2 Step - Trigger Interlock Switch
    31
    
    Wire Feed Speed Knob
    32
    
    Gun Receiver Bushing
    32
    
    Trigger Connector 5-Pin Amphenol
    32
Maintenance

43
- Installation
  44
- Safety Precautions
  45
  - Location
    45
  - Mounting
    45
  - Bench Mount
    46
  - Swivel Mount
    46
  - Boom Mount
    46
  - Suspended
    46
  - Weld Cable Sizes
    47
  - Coaxial Weld Cables
    48
  - Weld Cable Connections
    48
  - Welding Gun/Wire Feeder Trigger Connector
    51
  - High Frequency Protection
    51
  - Remote Sense Lead Specifications
    51
- Wire Drive Systems
  51
- Welding Guns, Torches and Accessories
  52
- Wire Drive Configuration
  53
- Assembly of Drive Rolls and Wire Guides
  54
- Pressure Arm Adjustment
  55
- Shielding Gas Connection
  56
  - Wire Reel Loading
    57
  - Weld Wire Routing
    58
- Installing Electrode Conduit Kits
  59
- Aluminum Wire Preparations
  60
- Common Equipment Set-Ups
  62
Table of Contents

65
- Common Welding Abbreviations
  66
- Operation
  66
- Safety Precautions
  66
- Product Description
  67
- Front Panel Controls and Connections
  68
  - Wire Feed Speed Knob
    69
  - Remote Voltage Control Kit (Optional
    69
  - Burnback and Postflow Timer Kit (Optional
    69
  - Thermal LED, Motor Overload
    69
  - Cold Feed/Gas Purge Switch
    69
  - Step - Trigger Interlock Switch
    70
  - Gun Receiver Bushing
    70
  - Trigger Connector 5-Pin Amphenol
    70
    
    Theory of Operation
    82
    
    General Description
    82
    
    Control Board
    83
Table of Contents

85
- How to Use Troubleshooting Guide
  86
- Troubleshooting Guide
  86
  - Pc Board Troubleshooting Procedures
    87
  - Drive Motor and Tach Feedback Test
    91
  - Gas Solenoid Test
    93
  - Diode Bridge Test
    95
  - Wire Speed Potentiometer Test
    97
  - PC Board Removal and Replacement
    99
    
    Wire Drive Motor and Gear Box
    101
    
    Troubleshooting and Repair
    102
  - Wire Drive Motor and Gear Box Removal and Replacement
    102
  - Retest after Repair
    105
Table of Contents

107

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