Cummins Engine ISX15 QSX15 (6 Cylinder). For the parts described with both part number and application machine model or engine model, please make sure to order according to the part number, the application machine model or engine model is just for reference. Skid Steer Loader Parts. Other Heavy Equipment Parts. We supply New Aftermarket Parts for the following. Off Road Truck Parts. Other Heavy Machine Parts. Kind reminder to our dear customers. Please make sure that you’re ordering the correct parts. Please let us know if you’re not happy with the goods and we will try our best to satisfy you.