Product Brochure

HD-7P / HD-7W Four-Post Lifts 24 P/N 5900041 — Rev. M — July 2019
About Safety Locks
Your Lift has two Safety Lock systems:
• Primary Safety Locks. Located at the ends of each of the four Crosstubes, the Primary Safety
Locks hold the Runways in place once they are engaged. Primary Safety Locks are used over 99
percent of the time. Once engaged, Primary Safety Locks hold the Runways in place, even if the
power goes out or the Hydraulic Hoses break or leak.
• Slack Safety Locks. Also located at the ends of each of the four Crosstubes, the Slack Safety
Locks are a backup system in case any of the four Lifting Cables ever breaks (which is a rare
occurrence). During normal operation, the Lifting Cables prevent the Slack Safety Locks from
engaging, but if a Lifting Cable breaks while the Lift is not engaged on its Primary Safety Locks, the
Slack Safety Lock next to the broken Lifting Cable immediately engages at the next Safety Lock
position in the Ladder.
The Slack Safety Locks get engaged during installation when you raise the Crosstubes (see
Raising the Crosstubes). Make sure to disengage them immediately after raising the
Crosstubes.
Important: Simply raising the Runways does not
engage them on the Primary Safety Locks. You
must back the Runways down onto the Safety Locks to engage them.
Each of the Lift’s four Posts has its own Ladder. Each Ladder has 17 Safety Lock holes. The Primary
Safety Locks and the Slack Safety Locks share the Safety Lock holes.
⚠ WARNING Safety Locks are dependent on correct installation of the Ladders. Pay careful
attention when installing the Ladders. If they not installed correctly, the Lift may not
be able to hold the weight of a Vehicle, which could fall and damage the Vehicle or
the Lift, or cause harm to any persons in the area.
The Ladders are steel pieces with holes spaced every four inches. As you raise the Runways, the
Primary Safety Locks move into the holes in the Ladder (they make a distinct sound when they do) as
they pass by the Safety Lock holes.
When you move the Runways back down after passing a Safety Lock hole, the Primary Safety Lock
engages. You will know this when the Runways stop moving down. Once they are engaged, Primary
Safety Locks stay engaged until you lower the Runways. Even if the power goes out or one of the
Hydraulic Hoses breaks or leaks, the engaged Primary Safety Locks hold the Runways in place.
⚠ WARNING Always leave the Lift’s Runways either fully lowered or engaged on Primary Safety
Locks. When you engage the Primary Safety Locks at a desired height, check to
make sure that all four (one per Post) are engaged at the same height.
So how do the Runways come down if the Primary Safety Locks are engaged? To lower the Runways,
you raise them a few inches (to get them off the Primary Safety Locks), then
press and hold down
the
pushbutton on the Pushbutton Air Valve. While you hold down the pushbutton, the Primary Safety
Locks are moved away from the Safety Lock holes in the Ladders; they are prevented from engaging,
which allows the Runways to be lowered.