PULLEY-FAN DRIVE 3P0165 - Caterpillar

Correct welding procedures are necessary in order to avoid damage to the following components:
Electronic Control Module (ECM) on the engine
Clean Emissions Module (CEM)
Sensors
Associated componentsComponents for the driven equipment should also be considered. When possible, 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 minimizes the 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, open the switch.
Disconnect all electronic components from the wiring harnesses. Include the following components:
Electronic components for the driven equipment
ECM
Sensors
Electronically controlled valves
Relays
Aftertreatment ID module
Do not use electrical components (ECM or ECM sensors) or electronic component grounding points for grounding the welder.
Illustration 1 g01143634
Service welding guide (typical diagram)
When possible, connect the ground clamp for the welding equipment directly to the engine component that will be welded. Place the clamp as close as possible to the weld. Close positioning reduces the risk 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 welding spatter.
Use standard welding procedures to weld the materials together.