Caterpillar 3126B / 3126B Industrial Engine — Welding on Engines with Electronic Controls
Repair & overhaul · ECM / engine electronics
For the Caterpillar 3126B / 3126B Industrial Engine, from the Caterpillar owner's manual.
Applies to: Caterpillar 3126B, Caterpillar 3126B Industrial Engine engine
Before you start
- Do not ground the welder to electrical components such as the ECM or sensors.
- Improper grounding can cause damage to bearings, hydraulic components, electrical components, and ground straps.
Procedure
- Stop the engine. Turn the switched power to the OFF position.
- Disconnect the negative battery cable from the battery. If a battery disconnect switch is provided, open the switch.
- Disconnect the J1/P1 and J2/P2 connectors from the ECM. Move the harness so it cannot contact ECM pins.
- Connect the welding ground cable directly to the part that will be welded. Place it as close as possible to the weld.
- Protect the wiring harness from welding debris and spatter.
- Use standard welding practices to weld the materials.
Full service-parts list: Caterpillar 3126B →, Caterpillar 3126B Industrial Engine engine →
Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.