Clutch replacement question, not adjustable?

Hey guys I have a silly question but I'm in a bind and I need to confirm I'm not losing my mind. My truck is being worked on by Velocity Truck. I am having a new clutch installed. The clutch brand is OTR (from Fleet Pride). So I was told yesterday that the clutch I brought DOES NOT have the ability to be adjusted. Therefore, the distance from the throwout bearing to the clutch brake is static with know way to open or close the gap. I have limited knowledge, but something is telling me this can't be the case. Naturally they had me buy a clutch from them. They are supposed to be done with the truck tomorrow. Is it possible that a clutch wouldn't be adjustable?? I'm thinking it is adjustable but they just don't know how to do it. I've seen three different type- one being automatic, another just a bolt that you turn while pushing in, then one where you take a bolt out and remove a "key" from the slot then spin the disk inside and replace the key. If it's this last style, maybe they aren't clear on this type. The truck is a 07 Peterbilt 379.

 

Appreciate the replies! OK so I gather one way or the other the clutch is adjustable. Beyond that it's just preference of manual vs automatic (solo). I can say the manual is $500 more dollars. I found my part number, here is what I have. https://www.fleetpride.com/parts/dr...nts/clutch/otr-clutch-tt20892582h?cclcl=en_US
So it is possible that this (national truck chain) mechanic doesn't know how to do the initial adjustment of the solo style. I'm trying to gather up the appropriate ammunition when I approach them in a couple hours. I'm already ticked at how long they've had my truck at 16 days to install a transmission that I literally brought to them the day I came in! Freakin' 30 hours of labor!! Wish I broke down at home where the labor is reasonable. Thanks guys.

 

Is there a quick way to identify the self adjusting properties with the clutch in my hand? I don't want to be standing there with them trying to rush me and over-talk me in order to escape responsibility.

 

great. thanks guys, tremendous help.