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Heavy Vehicle Extrication: Cab Components

Tue, 5 Jul 2011|

Battalion Chief Steve White and Lieutenant Eric Mohr of the Fishers Township (IN) Fire Department discuss the components of a big rig cab. Identifying these components can help rescuers when it comes time to making decisions vehicle during extrication operations.

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Transcript

[MUSIC] Welcome to Fire Engineering's Training Minutes. My name's Steve White and I'm a Battalion Chief with the Fishers Fire Department. In today's segment for heavy truck extraction we're gonna focus on the cab and all the components and power supplies so that they can be identified by rescuers to make the area safe before we begin extraction operation. To do this, we're gonna bring in Lieutenant Eric Mohr, also with the Fisher's Fire Department, to go from front to back to identify these components. >> As we talk about the cab components today. Inside the cab, simply, there's 2 knobs, a yellow and a red, that we pull on, just like in the fire truck. The yellow knob we pull on. To apply the parking brake and push in to release it. The red knob applies air in the braking system to the trailer. This truck is equipped with air ride we can adjust this air ride for stabilisation. If you can gain access to the cab, there is a switch to dump the air ride on some models. Moving backdown the truck we are looking at fuel tanks. On certain models there's 100 to 150 gallons of fuel on either side of the truck. This truck has a tank on one side. Not to get confused with the hydraulic fluid on this tank for the wet kick to operate hydraulic systems. On this model we have an air right suspension. As we look back the frame, down the frame to identify it, we see a spring. Not to be confused, this is a four bag air ride system. Simply look behind the axle to see the air bag. Some units have eight bags with a bag in the front. Looking down the frame you'll find the leveling valve. The leveling valve can be used for stabilization. Underneath the axle you have a brake chamber. The brake chamber is a maxi chamber comprised of two pancakes. That tells me that this axle has a parking brake. If it has a single pancake it does not have a parking brake which can be utilized. And stabilizing this unit if we have to stabilize the lift unit. The fifth wheel plate is removable. That the distributed weight on the axles for the proper load. The rear axle the same thing as in four back system, you see this spring in the front, air bags in the rear. Looking down at it, there's maxie chambers that we see. So it has a parking brake, so this [UNKNOWN] tells me that there's a parking brake. On both axles. Identifying batteries on any unit, start at the frame rail, moving forward, or in between the frame, or under the cab. On this unit we've identified the batteries by locating the battery cables going into the box. We have a switch here for disconnect. And the box has a simple cover on it we'll remove, lift and locate the batteries. We cut the batteries or remove, depending on your department's SOGs. Identifying the braking system, we discussed the Maxi Chambers. Here we have a service chamber located on the steer axle that tells me there is no parking brake on this axle. >> As we bring this segment of training minutes to a close, hopefully we're able to point out the hazards that rescuers can come across and some of the components that are important before we begin extrication operations. I'd like to thanks Lieutenant Moore for doing an excellent job for pointing all those out to us and we certainly want to thank Holmatro for sponsoring these training minutes.

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