Rolling Jack Measurement Guide

3945 - Rolling Jack Measurement Guide

Will This Jack Fit My Lift?

Runway and Ramp Style

To determine which of our Atlas Rolling Jacks will fit your 4-post lift, you must first look at the design of the runways on your lift.  There are three primary runway track designs that will affect which types of rolling jack you will be able to use on your lift.

Diagram 1 shows a lift with a shelf-style track off the bottom of the runway.  For this style of runway track, our Atlas RJ-35 sliding jack would be appropriate for your lift.

Skip to section 2 – Lift Dimensions for Sliding Jacks – to determine if your lift’s measurements are compatible with the required measurements of the RJ-35.  Our Atlas Garage Pro 8000, Garage Pro 8000 EXT, and Garage Pro XLT 4-post lifts incorporate this ramp design.

Diagram 2 shows a lift with a channel-style track.  For a lift with this style of runway track you may be able to use the Atlas RJ-6000, Atlas RJ-6, or the Atlas RJ-7000 jack.

The Atlas RJ-6000 and Atlas RJ-6 are the most universal of all of our rolling jacks. The RJ-6000 and RJ-6 work on our Atlas Garage Pro 9,000, Atlas 412, and Atlas 14KOF four post lift with the welded runway channels.

If your runway configuration is different than those shown in Diagram 1 or 2, advance to section 4 – Additional Information to look at specific information regarding the 3rd style of runway track.

Diagram 1

Diagram 2

Lift Dimensions for Sliding Jack

Once you have determined the ramp/rail style of your lift you are ready to start measuring to determine which Atlas rolling jacks will fit. If your lift ramps are similar in design to Diagram 1, you would only be able use our Atlas RJ-35 sliding jacks. These sliding jacks have two adjustable arms or brackets that rest on top of the runway. These brackets feature heavy duty nylon slide blocks to allow the operator to position the jack properly under the vehicle. The adjustable brackets adjust from 31″ to 47″. (See measurement A in Diagram 3)

Diagram 3

Lift Dimensions for Rolling Jacks

If the runways on your four post lift look like Diagram 2 (welded support channels or tracks on the side of the runways), the Atlas RJ-6000, Atlas RJ-6, or the Atlas RJ-7000 may work. If you need the extra lifting capacity and the professional rolling feature of the Atlas RJ-6000, Atlas RJ-6, or Atlas RJ-7000 rolling jacks, then there are other measurement requirements that must be met.

The mandatory measurements are shown in Diagram 4 below:

  • A. Distance between top of runways
  • B. Inside width of channel or track
  • C. Depth of channel or track.

Diagram 4

 

Atlas RJ-6000:

Measurement A must be between 32″-52″
Measurement B must be 1 1/8″ or wider
Measurement C must be at least ¾”

Atlas RJ-6:

Measurement A must be between 32″-48″
Measurement B must be 1 1/8″ or wider
Measurement C must be at least ¾”

Atlas RJ-7000:

Measurement A must be between 32″-52″
Measurement B must be 1 1/8″ or wider
Measurement C must be at least ¾”Atlas Pro 14K In the picture…

 

“Low Slung” Vehicles and 4-Post Lift Jacks

The overall height of the rolling or sliding jack and how it affects “low slung vehicles” is an important consideration.

Diagram 5 (height position of the jack rails) needs to be examined closely. The position of the jack should be so that the extended arms sit as low as possible over the runways.

The other important factor is that the base of the rolling/sliding jack should not sit much below runways.

If the jack sits too low, it is in danger of coming off the tracks when the lift is lowered all the way to the ground (lifting the jack when it touches the ground before the lift runways.)

Diagram 5

Additional Information

There is one other lift runway design that may affect the use of the Atlas RJ-6000, Atlas RJ-6, or the Atlas RJ-7000 and that would be if your lift has a “top lip” on the runway. (See Diagram 6)

Diagram 6

The top runway ramp “lip” may prevent our Atlas RJ-6000, Atlas RJ-6, and Atlas RJ-7000 jacks from being installed on the lower support channel. To make sure the Atlas RJ-6000, Atlas RJ-6, or Atlas RJ-7000 can be installed, your lift must meet measurement requirements listed in section 3 – Lift Dimensions for Rolling Jacks (Diagram 4) as well as one other important measurement.

  • Atlas RJ-6000 rolling jack measurement B in Diagram 6 must be at least 3″.
  • Atlas RJ-6 rolling jack measurement B in Diagram 6 must be at least 1 ¾”.
  • Atlas RJ-7000 rolling jack measurement B in Diagram 6 must be at least 3″.

If measurement B on your ramp/rail design is less than the above, these jacks may still fit properly.

Some lifts with this “top lip” ramp design will have a section of this “top lip” removed at the front or rear of the runway, allowing the rolling jack to be installed from one end and rolled into position. (We have had customers “modify” their “top lips” so that our jacks could be used). If the “top lip’ presents no installation issues, then measurement A in Diagram 7 needs to be 15 ½” to use the Atlas RJ-6000, Atlas RJ-6, or Atlas RJ-7000.

Diagram 7

Final Word

The above information is provided so that you, (the customer) can determine whether or not the Atlas RJ-35, Atlas RJ-6000, Atlas RJ-6, or Atlas RJ-7000 rolling jacks will work on your 4 post lift. Atlas Automotive Equipment cannot guarantee that these sliding and rolling bridge jacks will fit perfectly on all competitive four post lifts. It is the customer’s responsibility to measure accurately. Our jacks work perfectly; the question is whether our jack will fit perfectly on your lift. If it fits, the jack will work as promised.

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