Installation Guide

D4-9 / D4-9X Four-Post Lifts 24 P/N 5900251 — Rev. A— October 2020
About Safety Locks
Once engaged, Safety Locks hold the Runways in place, even if the power goes out or the Hydraulic
Hoses leak or break. Your Lift has multiple Safety Locks positions, spaced every four inches.
Important: Simply raising the Runways does
not engage them on the Safety Locks. You must
back the Runways down onto the Safety Locks to engage them.
⚠ WARNING Safety Locks are dependent on correct orientation of the Posts. The Posts must be
oriented so that the Safety Lock Holes are on the far outside of the Lift. If the Posts
are
not oriented correctly, this could lead to product or Vehicle damage, human
injury, or even (in rare cases) death.
Side view. Side of Post removed for clarity. Not necessarily to scale. Not all components shown.
⚠ WARNING Only leave the Runways either fully lowered or engaged on their Safety Locks. Do
not go under a Lift until you are certain that all four Safety Locks are engaged.
Out of an abundance of caution, your Lift has
two Safety Lock systems:
• Safety Locks: The primary system to hold up the Runways are the Safety Locks. When you
move the Runways up, you can hear clicks as the Safety Locks go into and then past the Safety
Lock Holes. When you want to keep the Runways at a certain height, go slightly past the height
you want, then back the Safety Locks down into the Safety Lock Holes, which engages them.
• Slack Safety: The Slack Safeties are above the Safety Locks on the ends of the Crosstube
Sleeves. They are different from the Safety Locks in that when the Lifting Cables are taut (during
normal operation), they hold the Slack Safeties away from the Safety Lock Holes so that they
cannot engage. However, if a Lifting Cable were to break (which is extremely rare), the Slack Safety
for the broken Lifting Cable immediately engages, which prevents the Runway from falling very far.