Caterpillar — Relay Module - Replace
Repair & overhaul
From a Caterpillar service manual — check it applies to your exact model before use.
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Before you start
- Remove the positive lead wire from the battery before starting.
Procedure
- Remove the positive lead wire from the battery.
- Mark all wires at the terminal strips and remove all wires from the terminals and posts.
- Remove ten screws that fasten the relay module to the PRCM.
- Partially separate the relay module; carefully disconnect the cable clamp and cable connector.
- Replace the desiccant package with the new package and tape included with the replacement module.
- Install new O-ring seal in the groove; align and reconnect the cable connector; install the cable clamp.
- Place relay module on the PRCM; install and tighten the ten screws.
- Reconnect all wires and the positive lead wire to the battery.
Specs & values
- Tighten the ten screws to 1.70 ± 0.25 N·m (15 ± 2 lb in)
- Replacement of the relay module is approximately a 20 minute procedure
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.