VIDEOClick to see full answer. Moreover, how does pump jack scaffolding work?The Pump Jack System allows you to raise workers, equipment and materials with the push of your foot, and to lower them with the turn of the hand crank. Your weight does the work. This versatile system can easily be adjusted to any height up to 30 feet, and save you half the time over other scaffolding. how high can pump jacks go? 48 feet Then, what is a pump jack scaffold? Pump jacks are a uniquely designed scaffold consisting of a platform supported by moveable brackets on vertical poles. The brackets are designed to be raised and lowered in a manner similar to an automobile jack.Are ladder jacks safe? Re: Ladder Jacks, Weight Limitations I like ladder jacks, they are convenient. But they are not the safest kind of scaffold, do some careful planning, use a third ladder for access, and you still need fall protection using either a harness or railing.