Welding Precaution
Proper welding procedures are necessary to avoid damage to the Electronic Control Module (ECM), sensors, and associated components. Also consider components that are for the driven equipment. Remove the component that requires welding. When welding on an engine that is equipped with an ECM and removal of the component is not possible, the following procedure must be followed. This procedure provides the minimum amount of risk to the electronic components.
- Stop the engine. Remove the electrical power from the ECM.
- Ensure that the fuel supply to the engine is turned off.
- Disconnect the negative battery cable from the battery. If a battery disconnect switch is installed, turn the switch to the OFF position.
- Disconnect all electronic components from the wiring harnesses. Electronic components include the following components:
- Electronic components for the driven equipment
- Engine ECM
- Sensors
Show/hide tableNOTICE Do NOT use electrical components (ECM or sensors) or electronic component grounding points for grounding the welder.
Show/hide table
Illustration 1 g01143634 Service welding guide (typical diagram) - When possible, connect the welder ground clamp directly to the engine component that will be welded. Place the clamp as close as possible to the weld. A close connection will reduce the possibility of welding current damage to the engine bearings, to the electrical components, and to other components.
- Protect the wiring harnesses from welding debris and/or from the welding spatter.
- Use standard welding procedures to weld the materials together.
Caterpillar Information System:
D6K2 Track-Type Tractor Machine Systems Accumulator (Hydraulic) - Remove and Install
D6K Track-Type Tractor Fuses and Circuit Breakers - Replace/Reset
An Improved Track Adjuster Yoke Allows for a Higher Rated Fuse Plate That Will Provide a More Reliable and Durable Recoil System is Now Used On Certain D3K2, D4K2, and D5K2 Track-Type Tractors {4157} An Improved Track Adjuster Yoke Allows for a Higher Rated Fuse Plate That Will Provide a More Reliable and Durable Recoil System is Now Used On Certain D3K2, D4K2, and D5K2 Track-Type Tractors {4157}
C27 and C32 Engine for MD6250 and MD6310 Drill Engine Misfires, Runs Rough or Is Unstable
Improved Angle Cylinder Pin Designs Are Now Available For Certain D6T Track-Type Tractors {6052, 6060, 6701} Improved Angle Cylinder Pin Designs Are Now Available For Certain D6T Track-Type Tractors {6052, 6060, 6701}
Installation Procedure For Updating Angle Cylinder Pins on Certain D6T Track-Type Tractors {6052, 6060, 6701} Installation Procedure For Updating Angle Cylinder Pins on Certain D6T Track-Type Tractors {6052, 6060, 6701}
C32 Tier 4 Final Marine Commercial Engines Crankcase Pressure Is High
A New Tube Assembly for the Push-Pull Arrangement is Now Used on Certain 621K and 627K Wheel Tractor-Scrapers {5057, 5308, 5479, 7103, 7253} A New Tube Assembly for the Push-Pull Arrangement is Now Used on Certain 621K and 627K Wheel Tractor-Scrapers {5057, 5308, 5479, 7103, 7253}
Improved Ripper Cylinder Rod Assemblies are Now Used On Certain D10T Track-Type Tractors {5352, 5356} Improved Ripper Cylinder Rod Assemblies are Now Used On Certain D10T Track-Type Tractors {5352, 5356}
MD6200 Rotary Drill Condenser (Refrigerant) - Clean
Check Power Train Diagnostic Codes on AD60 Underground Articulated Trucks {4800, 7610} Check Power Train Diagnostic Codes on AD60 Underground Articulated Trucks {4800, 7610}
D6K2 Track-Type Tractor Machine Systems Gear Pump (Fan Drive) - Remove and Install
D6K2 Track-Type Tractor Machine Systems Ripper Lift Cylinder - Remove and Install
A Procedure to Rework the Air Conditioner Group Filter Cover Is Used for Certain K-Series and M-Series Medium Wheel Loaders {7320, 7342} A Procedure to Rework the Air Conditioner Group Filter Cover Is Used for Certain K-Series and M-Series Medium Wheel Loaders {7320, 7342}
Recommendations for Calculating Service Brake Shimming During Axle Repairs on Certain Telehandlers {5486} Recommendations for Calculating Service Brake Shimming During Axle Repairs on Certain Telehandlers {5486}
Replacement Solenoid Valves May Fail on Certain Transmissions {3073, 3167, 3174, 5479, 7499} Replacement Solenoid Valves May Fail on Certain Transmissions {3073, 3167, 3174, 5479, 7499}
Scuffing/Scoring May Occur in Bevel Gear Set on Certain 992K and 854K Wheel Dozers {3254, 3256, 3257, 3258} Scuffing/Scoring May Occur in Bevel Gear Set on Certain 992K and 854K Wheel Dozers {3254, 3256, 3257, 3258}
An Improved Sealing Process for Air Conditioning Cover Bolts and Bosses on Certain Series K, Series L, Series M, and Series GC Medium Wheel Loaders {7320} An Improved Sealing Process for Air Conditioning Cover Bolts and Bosses on Certain Series K, Series L, Series M, and Series GC Medium Wheel Loaders {7320}
994K Wheel Loader Systems Air Lines
320GC, 320 and 323 Excavators Machine Systems Stick - Remove and Install
D6K Track-Type Tractor Fuel System Primary and Secondary Filters - Replace
D6K2 Track-Type Tractor Machine Systems Ripper Control Linkage - Remove and Install
D6K Track-Type Tractor Engine Air Filter Primary and/or Secondary Element - Clean/Replace
320GC, 320 and 323 Excavators Machine Systems Main Control Valve - Disassemble