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Welding System
Miller Electric
Bobcat 250
manual
Maintenance Label Robin-Powered Units
Models:
Bobcat 250
1
36
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Troubleshooting
Specification
Poor Weld Bead Characteristics
Install
Parts list
Electrical Diagrams
Symbol Usage
Welding Wire can cause injury
Dimension
Stick Welding Procedure
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A complete Parts List is available at www.MillerWelds.com
8-2.
Maintenance Label
(Robin-Powered
Units)
OM-4419
Page 32
Page 35
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Contents
OM-4419
File Engine Drive
Visit our website at
2007−05
From Miller to You
Table of Contents
10-1
10-2
10-3
11-1
Symbol Usage
Arc Welding Hazards
Electric Shock can kill
HOT Parts can cause severe burns
Fumes and Gases can be hazardous
Buildup of GAS can injure or kill
ARC Rays can burn eyes and skin
Welding can cause fire or explosion
Engine Hazards
Compressed Air Hazards
Welding Wire can cause injury
HOT Parts can cause burns and injury
Fire or Explosion hazard
Falling Unit can cause injury
Principal Safety Standards
California Proposition 65 Warnings
EMF Information
Radiation can cause interference
Signification des symboles
− Consignes DE Sécurité − Lire Avant Utilisation
UN Choc Électrique peut tuer
Indique des instructions spécifiques
DES Pièces Chaudes peuvent provoquer des brûlures graves
LES Fumées ET LES GAZ peuvent être dangereux
LE Soudage peut provoquer un in cendie ou une explosion
LE Bruit peut affecter l’ouïe
’EXPLOSION DE LA Batterie peu
DES Organes Mobiles peuvent pro voquer des blessures
LA Chaleur DU Moteur peut pro- voquer un incendie
’AIR Comprimé peut provoquer des blessures
Risque D’INCENDIE OU D’EXPLO- Sion
LE Surchauffement peut endom- mager le moteur électrique
DES Organes Mobiles peuvent provoquer des blessures
LES Fils DE Soudage peuvent provoquer des blessures
’EMPLOI Excessif peut
Proposition californienne 65 Avertissements
Principales normes de sécurité
Information EMF
En ce qui concerne les implants médicaux
− Specifications
Symbol Definitions
Weld, Power, and Engine Specifications
− Definitions
Dimensions, Weights, and Operating Angles
Dimensions For Units With Optional Running Gear
Robin-PoweredUnit 560 lb 254 kg
Dimensions
Fuel Consumption Robin-Powered Units
Fuel Consumption Kohler-Powered Units
For CC/AC Mode
For CC/DC Mode For CV/DC Mode
Volt-Ampere Curves
Generator Power Curve
Duty Cycle
100% Duty Cycle at 250 Amperes
− Installation
Installing Welding Generator
Engine Prestart Checks Robin-Powered Units
0000
Oil Check
Oil
Engine Prestart Checks Kohler-Powered Units
Open top service door
Installing Exhaust Pipe
Connecting Or Replacing the Battery
Connecting The Battery Connect negative − cable last
+ −
Connecting to Weld Output Terminals
Tools Needed Correct Installation
Stop engine
Work Weld Output Terminal
Selecting Weld Cable Sizes
− Operating the Welding Generator
Front Panel Controls
Cold Weather Engine Operation
Infrequently
Loaded
Frequently Loaded
Typical Stick Welding Connections And Control Settings
Typical Settings For 7018 1/8 in Electrode
Work Clamp Electrode Holder
Tools Needed 3/4
Typical MIG Welding Connections And Settings
Solid Wire Applications
Fine Control, Weld Process switch Settings Quick connector
Be sure to use the correct size weld cables see Section
Self-Shielded Flux Core Wire Applications
Fine Control, Weld Process switch Settings
Typical Settings For 4043
Aluminum On 1/8 in Material
Work
Lines and may not suit all applications Cables see Section
Generator Power Receptacles
− Operating Auxiliary Equipment
Simultaneous Weld And Power
Wiring Optional 240 Volt Plug
Current Available in Amperes 240
Receptacle
Routine Maintenance Robin-Powered Units
100
200
500
Maintenance Label Robin-Powered Units
Servicing Air Cleaner Robin-Powered Units
Overload Protection Robin-Powered Units
Stop engine. Disconnect negative − battery cable
Oil Fill Oil Check
Full
Stop engine and let cool
Oil Drain Valve 2 ID x 7 in Hose Oil Filter
Adjusting Engine Speed Robin-Powered Units
Idle Speed Adjustment
Turn idle speed screw for fine adjustments
Weld/Power Speed Adjustment
Servicing Optional Spark Arrestor Robin-Powered Units
Material Thickness Reference Chart
Routine Maintenance Kohler-Powered Units
Hours Nl Weld Cables ~ Slip Rings Nl Brushes OM-4419
Maintenance Label Kohler-Powered Units
Servicing Air Cleaner Kohler−Powered Units
Stop engine and let cool Oil Drain Valve
2 ID x 7 in Hose Oil Filter
Close valve and valve cap before adding oil Full
Up fuel
Adjusting Engine Speed Kohler-Powered Units
Turn idle speed screw for fine ad- justments
Overload Protection Kohler-Powered Units
Servicing Optional Spark Arrestor Kohler-Powered Units
− Troubleshooting
Welding Troubleshooting
Generator Power Troubleshooting
Trouble Remedy
Engine Troubleshooting
Check receptacle wiring and connections
Check fuel level
− Parts List
Switch S2, and throttle solenoid TS1
Recommended Spare Parts
Recommended Spare Parts
− Electrical Diagrams
Circuit Diagram For Welding Generator
228 460-A
− Generator Power Guidelines
Selecting Equipment
Grounding Generator To Truck Or Trailer Frame
Electrically Bond Generator
Grounding When Supplying Building Systems
How Much Power Does Equipment Require?
Use ground device as stated in electrical codes
Amperes x Volts = Watts
Approximate Power Requirements For Industrial Motors
Approximate Power Requirements For Farm/Home Equipment
Industrial Motors Rating Starting Watts Running Watts
Farm/Home Equipment Rating Starting Watts Running Watts
Approximate Power Requirements For Contractor Equipment
Contractor Rating Starting Watts Running Watts
Power Required To Start Motor
How Much Power Can Generator Supply?
Single-Phase Induction Motor Starting Requirements
KVA/HP x HP x 1000 / Volts = Starting Amperage
Typical Connections To Supply Standby Power
Selecting Extension Cord Use Shortest Cord Possible
Stick Welding Procedure
Weld current starts when electrode touches work- piece
− Stick Welding Smaw Guidelines
Electrode and Amperage Selection Chart
Striking an Arc − Scratch Start Technique
Striking an Arc − Tapping Technique
Poor Weld Bead Characteristics
Good Weld Bead Characteristics
Positioning Electrode Holder
10-30 9090
Conditions That Affect Weld Bead Shape
Electrode Movement During Welding
Butt Joints
Lap Joint
Tee Joint
Or Less
Troubleshooting − Porosity
Troubleshooting − Excessive Spatter
Weld Test
Possible Causes Corrective Actions
Troubleshooting − Incomplete Fusion
Troubleshooting − Lack Of Penetration
Troubleshooting − Excessive Penetration
Troubleshooting − Burn-Through
Troubleshooting − Waviness Of Bead
Troubleshooting − Distortion
− MIG Welding Gmaw Guidelines
Holding And Positioning Welding Gun
Push Perpendicular Drag
Short Normal Long
Slow Normal Fast
Gun Movement During Welding
15-7 Troubleshooting − Excessive Spatter
15-8 Troubleshooting − Porosity
15-9 Troubleshooting − Excessive Penetration
Lack Of Penetration − shallow
Fusion between weld metal
Improper joint preparation
Unsteady hand Support hand on solid surface or use two hands
Common MIG Shielding Gases
Application
Fillet
Page
Service
Your distributor also gives
Support
To locate a Distributor or Service Agency visit
Miller Electric Mfg. Co
For assistance in filing or settling claims, contact
Your distributor and/or equipment manufacturer’s
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