The compressor motor pulley is what you use to pull the pulley chain and the air compressor from the back of your truck. If the pulley chain becomes loose, you will not be able to start your vehicle. If the chain loosens because of rust, the chain may need to be replaced as well. When it comes to purchasing your new motor, check out the compressor pulley to make sure that you get the right one for your vehicle. You will also need to inspect the air lines to make sure that they are properly installed. You will find that the majority of trucks come with the pulley chains already installed in them. If not, you can easily take them off of the chains and install them yourself, or you can just purchase the replacement chains that you need for your truck.
When you are checking the pulleys, be sure to turn the air compressor slowly using a smaller motor. This will help to loosen up the chain. Once you are sure that the chain is loosened up, you will want to take off the engine compartment and disconnect the water pump. This will allow you to remove the old chain and the old pulley. You will find that the chain needs to be replaced if you have a cylinder-piston pump and need to change the pulley chains. If your motor does not come with replacement chains, you can use the OEM ones or you can purchase the new ones that you will need. It is important to inspect your compressors and the pulleys when they first arrive, so you can make sure that you get the ones that you need in order to start your vehicle.