JLG® X550AJ Compact Crawler Boom Lift JLG JLG® X550AJ Compact Crawler Boom Lift Go more places around the job site thanks to the low weight and rubber tracks on the new X550AJ Compact Crawler Boom. The X550AJ has a tracked wheel carriage and a narrow chassis for access through gates, yards, standard doorways and public buildings. Plus, it can fit on a trailer or tilt-back truck for ease of transport. With 51 ft platform height, 21 ft outreach and 440 lb capacity, you’ve got a mobile, lightweight tool that lets you reach places other machines can’t. One-touch outrigger leveling and an interactive display in the platform provide operator convenience. The X550AJ is also environmentally-friendly, with electric and combustion combination power for efficient energy usage. Learn more about our Compact Crawler Booms.