4-Post Jack Measurement Guide

To determine which of our Direct Lift and Atlas Rolling Bridge Jacks will fit your 4-post lift,
you must first look at the design of the runways on your lift.

If your runways look like Diagram 1, both our Direct Lift Projack 3500 and the Master Series 3,500 LB. sliding jack would fit on your lift.
Skip to Section 2 to determine if your lift's measurements are compatible to the required measurements of the Direct Lift Projack 3500 and the Master Series 3,500 LB. sliding jack. Our Direct Lift Pro Park 8 Standard and Pro Park 8 Plus and Atlas Garage Pro 8,000 and Garage Pro 8,000 Plus 4-post lifts incorporate this ramp design.

If your runways look like Diagram 2, you may be able to use the Direct Lift Projack 3500, the Direct Lift Projack 4500, Atlas RJ-6000, Atlas RJ-6, or the Atlas RJ-7000 jack. Our Direct Lift Pro Park 9 Plus and our Atlas Pro 14 have a rail channel configuration as shown in Diagram 2.

If your runway configuration is different than those shown in Diagram 1 or 2, advance to Section 4 for additional information.

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 Direct Lift Pro Park 9 PLUS, Atlas Garage Pro 9,000, Atlas 412, Atlas Pro 14K, Atlas 14KOF, and Atlas Pro OF14K four post lift with the welded runway channels.

Total 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 set as low as possible over the runways. The other important factor is that the base of the rolling/sliding jack should not set much below runways. If the jack sets too low, when the lift is lowered all the way, the jack could contact the ground first and be "lifted" off of the rails.








Once you have determined the ramp/rail style of your lift you are ready to start measuring to determine which Direct Lift or Atlas rolling jacks will fit. If your lift ramps are similar in design to Diagram 1, you would only be able use our Direct Lift Projack 3500 or Master Series 3,500 LB. 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)





If the runways on your four post lift look like Diagram 2 (welded support channels or tracks on the side of the runways), the Direct Lift Projack 3500, the Direct Lift Projack 4500, 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 Direct Lift Projack 4500, 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, and C depth of channel or track.

Direct Lift Projack 4500:	Measurement A must be between 35" - 51" Measurement B must be 1 ½" or wider Measurement C must be between 1" and 1 ¾"
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 14 In the picture...

Total 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 set as low as possible over the runways. The other important factor is that the base of the rolling/sliding jack should not set much below runways. If the jack sets too low, when the lift is lowered all the way, the jack could contact the ground first and be "lifted" off of the rails.





There is one other lift design that may or may not affect the use of the Direct Lift Projack 3500, Projack 4500, RJ-6000, RJ-6, or the Atlas RJ-7000 and that would be if your lift has a "top lip" on the runway. (See Diagram 6)



To use the Direct Lift Projack 3500 bridge jack on a lift with this design;
measurement A must be between 31"- 47".

The top runway ramp "lip" may prevent our Direct Lift Projack 4500, Atlas RJ-6000, Atlas RJ-6, and Atlas RJ-7000 jacks from being installed on the lower support channel. To make sure the Direct Lift Projack 4500, Atlas RJ-6000, Atlas RJ-6, or Atlas RJ-7000 can be installed, your lift must meet measurement requirements listed in Section 3, (Diagram 4), PLUS one other important measurement.

Direct Lift Projack 4500 measurement B in Diagram 6 must be at least 4 ¼".
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 lift" 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 Direct Lift Projack 4500, Atlas RJ-6000, Atlas RJ-6, or Atlas RJ-7000.





The above information is provided so that you, (the customer) can determine whether or not the Direct Lift Projack 3500, Direct Lift Projack 4500, Atlas RJ-6000, Atlas RJ-6, or Atlas RJ-7000 rolling jacks will work on your 4 post lift. Greg Smith Equipment cannot guarantee that these sliding and rolling bridge jacks will work 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. The customer is always responsible for any restocking and/or freight costs if the jack is returned because "it did not fit".