We must have one of the few trucks out there running 2.5 hydraulic bumpstops with 2.5 inches of travel. In fact, Fox Racing Shox tells us that our request for a pair was a first. After setting up all the suspension on a project truck we have, we realized we were extremely limited on compression travel. Since the truck was big enough to call for 2.5-inch-diameter hydraulic bumpstops over 2.0s, we had already set the truck up for 2.5s, welding the bump cans into the boxed frame, and setting up the truck with only an inch of compression travel before the axle contacted the 4-inch-stroke 2.5 bumpstops. It was obvious that we needed to shorten the bumpstop travel, and subsequently gain more free inches of travel before the axle contacts the bumpstops. 1. You don't need a lot of tools to break into a hydraulic bumpstop. And if you have an available high-pressure nitrogen source, shock oil, a new valve nut, and a vise, you can fine-tune your bumpstops at home.1. You don't need a lot of tools to break into a hydraulic bumpstop. And if you have an av 2. The first important step is to let all the pressure out of the bumpstop. Once it is no longer pressurized, you can remove the bearing cap with a 5/64 allen wrench and pop out the snap ring.2. The first important step is to let all the pressure out of the bumpstop. Once it is no 3. Once the snap ring is out, you can lift the shaft out of the body. To add a spacer and limit bumpstop travel, the valve nut needs to be removed with a 3/4 wrench. These valve nuts are one-time-use and need to be replaced once loosened.3. Once the snap ring is out, you can lift the shaft out of the body. To add a spacer and 4. Fox custom-cut some spacers to the length we asked for. Technically, we could have cut the spacers whatever length we wanted to accommodate the bumpstop travel amount we want. A 2-inch spacer that would bring our hydraulic bumpstops to 2.5 inches of travel was perfect for us. You'll notice that there are factory spacers already in the body directly from Fox. Don't try to remove these to get extra inches of bumpstop travel. Once done, load the valve on and put 30 lb-ft of torque onto the valve nut.4. Fox custom-cut some spacers to the length we asked for. Technically, we could have cut 5. If you're taking the time to pull your bumpstop apart, you might want to take the time to put new shock oil in it. We put roughly 175 ml of oil back into each 2.5 hydraulic bumpstop.5. If you're taking the time to pull your bumpstop apart, you might want to take the time 6. With oil in the body and the shaft back in, it was time to tighten the bearing cap back on.6. With oil in the body and the shaft back in, it was time to tighten the bearing cap back 7. You can slightly manipulate the stiffness of a hydraulic bumpstop by changing the nitrogen pressure in the bumpstop. Fox says that its bumpstops can safely operate with anywhere from 10 to 500 psi. We put our bumpstops' nitrogen pressure at 210 psi.7. You can slightly manipulate the stiffness of a hydraulic bumpstop by changing the nitro 8. With our 2.5 Fox hydraulic bumpstops finished, we had exactly 2.5 inches of controlled compression travel.8. With our 2.5 Fox hydraulic bumpstops finished, we had exactly 2.5 inches of controlled Sources Fox Racing Shox 130 Hangar Way Watsonville CA 95076 619-768-1800 www.foxracingshox.com By CC Rogers Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!
