Caterpillar — Programmable Relay Control Module - Replace

Repair & overhaul · PRCM

From a Caterpillar service manual — check it applies to your exact model before use.

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Procedure

1. Note the value for the hour meter, all engine setpoints, spare inputs and spare outputs from the old PRCM.
2. Shut down the engine; remove the positive lead wire from the battery.
3. Remove the harness connector from the PRCM; a 4 mm hex wrench is required.
4. Mark all wires at the terminal strips and remove all wires from terminals and posts.
5. Remove the six nuts that fasten the PRCM to the front panel; remove the PRCM.
6. Place the new PRCM in the front panel; install and tighten the six nuts.
7. Reconnect the harness connector and all wires; reconnect the positive lead wire to the battery.
8. Reprogram the setpoints, the spare inputs/outputs and the hour meter using the original values.

Source: Caterpillar service 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.

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