Atlas MR6K Review: Rolling Jack Scissor Lift for the Mobile Mechanic

The MR6K borrows a tool from four-post lift bays and puts it on the floor. A rolling bridge jack normally rides the runways of a four-post lift and raises one axle for brake and suspension work. Atlas puts the same scissor mechanism on heavy swivel casters so it rolls across a garage floor, slides under the front or rear of a car at 3 in of ground clearance, and raises that end to 28 in on air-over-hydraulic power. Capacity is 6,000 lb per unit, which is more than any single axle of a passenger vehicle carries.

That makes it a different proposition from the QuickJack BL-5000SLX or a scissor platform. It does not lift the whole car unless two units are bought and used together. What it does is lift one end fast, without positioning frames to specific pinch welds, and then get out of the way. For tire rotations, brake jobs, wheel bearings, control arms and exhaust work at one end of the car, that is the whole job.

The 42 in length and 280 lb unit weight are sized for a bay rather than a wall, and the price of around $1,799 is per unit.

Three numbers describe the MR6K's fit. The 6,000 lb per-unit rating means a single jack under the nose of a 5,600 lb Tahoe is nowhere near its limit, because the front axle of that truck carries roughly 3,000 lb. The 28 in rise puts a car's rocker at about 34 in, which is creeper-plus height: enough to sit upright at the wheel well, not enough to stand under the car. And the 3 in collapsed height is the number that makes the MR6K interesting to owners of lowered cars, because it slides under a car that a 4.5 in scissor platform or a 3 in QuickJack frame cannot be placed under without ramps.

The lift pads sit on adjustable arms and meet the vehicle at frame rails or pinch welds. A car with lift points close to the axle line is easy. A car whose factory points sit well inboard needs pad adapters, which Atlas sells.

What the rise does not do is raise both ends. One unit under the front leaves the rear wheels on the ground, which is fine for brakes and useless for a transmission pan.

The MR6K is air-over-hydraulic. A compressor pushes air into a hydraulic pump inside the unit, the pump raises the scissor, and once the mechanical locks are set the air line can be disconnected. There is no power cord and no hydraulic hose between the jack and a power unit, which is why the unit rolls freely. The requirement is a compressor capable of the pressure Atlas specifies, which most 20 to 30 gallon garage compressors meet. A garage with no air has no way to use this lift.

The floor is the second requirement and the one that decides whether the casters are a convenience or a nuisance. Swivel casters carrying 280 lb of steel need smooth, sealed, level concrete. Cracks, expansion joints with a lip, and broom-finished slab all catch the wheels, and a sloped floor lets a loaded unit creep unless the caster locks are set. Set them every time.

There is no installation. The unit comes on a pallet, the pads are adjusted for the first vehicle, and the air line is connected. That is a 20-minute job for one person, and the whole point of the design is that it is the last setup step there is.

Each MR6K has mechanical safety locks that engage as the scissor rises, so the load sits on steel once the lift stops. An overload valve in the hydraulic circuit prevents the air pump from pushing past the rated capacity. Lowering requires a brief raise to free the locks, then a controlled descent through the release. Caster locks hold the unit still while loaded, and the manual treats them as mandatory.

Atlas does not list ALI certification for the MR6K, which is common for rolling jacks sold as standalone tools; the ALI program covers rolling jacks mainly as accessories to certified four-post lifts. That means no third-party lab has evaluated this unit as a standalone floor lift, and a commercial shop should weigh that before putting it in a bay.

The two-unit question is the safety issue that matters most for home users. One jack under the front of a car with the rear wheels chocked is a stable arrangement. Two jacks raising both ends together require the operator to raise them in steps and keep the vehicle level, because the units are not synchronized. That is manageable, and it is more attention than a platform lift asks for. Buyers who want the whole car up at once with one button should look at a platform.

The QuickJack BL-5000SLX (around $1,499) lifts the whole car to 24 in on 110V and stores on a wall. It is the better buy for an owner with no compressor who wants everything off the ground at once. The MR6K is the better buy for an owner who lifts one end at a time, has air, and needs to get under a lowered car without ramps.

The Triumph NSS-6 (around $2,199) is a 620 lb scissor platform that raises 6,000 lb to 36 in on 110V. It gives more height and whole-vehicle lifting, and it stays on the floor.

The BendPak RBJ6000 (around $2,399) is the direct competitor: a pneumatic rolling bridge jack rated at 6,000 lb with 32 in of rise, 350 lb per unit, and a 5-year structural warranty. It costs about $600 more than the MR6K and buys 4 in of rise, a longer warranty and BendPak's dealer network. In our view the BendPak is worth the difference for a shop that will use the jack daily; for a home garage that lifts one end of a car twice a month, the Atlas does the same work for less.

The MR6K is a good tool for a specific person: someone with a compressor, a smooth garage floor, and more than one car, who does most of their work at one end of the vehicle and wants a lift that rolls to the car instead of the other way around. Owners of lowered cars are the clearest case, because the 3 in profile is what gets under a car on coilovers, and shops with a four-post lift will recognize the tool from their runways.

It is the wrong buy for a garage without air, for a floor with joints and cracks, and for anyone who expects the whole car in the air at standing height. It is also poor value as a whole-vehicle lift, because two units cost around $3,600, which is BendPak MD-6XP money for less rise and no synchronization.

For one-end work with air on hand, the MR6K is the rolling jack we would buy before spending $600 more on the RBJ6000. Without air, the QuickJack is the answer.