9-Pin Adapter for Caterpillar Commercial Vehicle Diagnostics The CAT9 adapter is a 9-pin off-highway vehicle adapter for use on construction and agriculture machines and vehicles operating off-road using Caterpillar engines. Compatible with the MaxiSYS MS909CV tablet and VCI (with applicable software updates), the Cat-9 adapter enables diagnosis of Caterpillar engines on off-highway vehicles. The adapter is covered by a one-year limited warranty.
