2005 All Other Makes All Other Models vacuum truck moved while vacuuming

JULIEF

MEMBER
2005 ALL OTHER MAKES ALL OTHER MODELS
100,000 MILES

I work for a company in heavy industry and we have an incident that is hard to understand. I'm in safety and am looking for root cause.
We have a guzzler vac truck with an OMSI transfer case. While vacuuming. The truck took off and moved through the parking brake and chocks and struck a concrete silo. The throttle interlock was operational in both road mode and work mode. This was wired incorrectly. My mechanics tell me it still couldn't happen with the transfer case the way it is set up. The rpms got up to 1300 and the truck took off through the brake.
Would we see significant damage in the transfer case if this were to happen? Or could it have only slipped enough to make it move without damaging it tremendously? My engineers tell me it should look like hell in there but they didn't see that outcome.
The transfer case looked "fine with normal wear and tear for an 8 yr old truck" but does that mean we even know what we are looking for?

Confused in KY,

thanks,
Julie

1 Reply

HMAC300

MECHANIC
48,601 POSTS

Not knowing the diagram of the t case nor how it is engaged. It may have been partially engaged and with engine vibration may have slipped into gear andtook off. You wouldn't notice any thing in particular as far as damage to the tcase. Especially if there is a synchronizer to engage it.