We are a supplier of equipment rentals and our customer is a month behind on payments so we are pulling the equipment off the job site. If the contractor doesn't allow us on the job site what our my options to force them to let us on?
Chris covered the options for recovering the equipment. Have you considered just letting the equipment stay on site and continue sending the customer bills for the rental? Depending on the type of project, that might be a good strategy. For example, if this were a FDOT road project, then there is a payment bond in place which pretty much guarantees you will be paid, provided you timely served your notice to contractor on the GC.