Suspension service on heavy-duty trucks requires more than just muscle. Learn the professional procedure for pin removal using the ATC 9996791. Why Standard Sockets Fail Many technicians attempt to use a standard deep-well or 12-point socket on spring pins. Because these pins are often proprietary in shape, the contact points are minimal. Under the high torque of an impact gun, the socket slips, rounding the corners of the pin. The ATC 9996791 is a dedicated suspension socket designed specifically for the Mack and Volvo platforms, ensuring the tool stays centered and locked under load. 5 Steps to Professional Pin Service Debris Removal: Use a wire brush to clean the pin head and hanger area of road salt and rust. Penetrant Application: Apply a high-quality penetrating oil and allow it to soak to ease the break-away torque. Socket Engagement: Fully seat the ATC 9996791 onto the pin. Ensure there is zero "wobble" before applying force. Torque Application: Use a high-torque impact wrench or a heavy-duty breaker bar. The ATC 9996791 is rated for impact use to handle extreme resistance. Installation Torque: When installing new pins, use the socket to reach OEM torque specifications to ensure the suspension pivot remains secure. SUSPENSION SAFETY: Always support the vehicle frame properly before removing spring pins. A shifting leaf spring under tension can cause severe injury. Heavy-Duty Service. Shop Apex Tools. Get the Pin Socket Now