It really depends on the model of the fifthwheel. All of the maintenance procedures are online and free. you must know the manufacturer and model of the fifth wheel. Examples of common manufacturers are, Fontaine, Holland/Simplex/ASF, Jost. You will need a 2" kingpin to properly adjust it. Be very careful because these fifthwheels are spring loaded and can hurt you. The adjustments are straight forward and pretty simple no matter which model is installed on the truck.
Loosen.
Gotta find out what's wrong with the fifth wheel. If the jaws are stuck, the horseshoe might need to be replaced, or the whole thing might have to be rebuilt. But, ensure that the fifth wheel is properly adjusted, and that there's no pressure on the jaws when you try to release it.
At a Mack Trucks dealership.
Mack doesn't make a pickup '1/2 ton' style truck.
Either a Mack or a Cummins engine.
If the gearbox is causing freeplay in the steering wheel, then the gearbox needs to be replaced.
No
you spelled mack wrong...its mac
Mack cyclinder head
it is in the www.toogle.com
1900
Many cities have an authorized Mack Truck Dealership. They offer new and used Mack trucks for sale or can help you locate the model you want. If your city or surrounding area does not have a Mack Truck Dealer, you can also look in your local newspaper classified ads under "Used Heavy Equipment" for Mack Trucks.