Does Atlas IV Double-Acting Hydraulic Trailer Jack # ST73FR Come with Fluid

Question

Question:

Does it come pre-filled with hydraulic fluid? If not, what fluid do I use?

asked by: Blaze

0

Expert Reply:

Yo Blaze, the Atlas IV Double-Acting Hydraulic Trailer Jack # ST73FR that you referenced does not come with fluid as it is designed to attach to a hydraulic system

expert reply by: Jameson C

0

Jameson C.

9/12/2025

Hey Blaze, did you find the right hydraulic fluid to use with your Atlas IV Jack? I'm asking because knowing your experience could help others in a similar situation.

Answer 1

Hey Harry! I linked a dimensional diagram below of the bolt pattern dimensions you requested for the Hydraulic Jack w/ Integrated Counter Balance Valve item #e23VV. The cylinder is 5" in diameter. There are two hydraulic fittings: 9/16-18 #6 SAE…

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Answer 2

Hey Jolisa, The bolt on bracket on this jack is not adjustable. It is a 8" wide x 7" tall bracket with 2" between each mounting hole. This jack is great option for any 5th wheel, gooseneck, dump trailers or any hauler. As long as you…

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Answer 3

Hey Jerry, thanks for reaching out. The Atlas IV Hydraulic Trailer Jack #ST23FR is a single-acting hydraulic jack, so hydraulic pressure is only used to extend the cylinder. Once the trailer is coupled and the tongue weight is off the jack, the…

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Answer 4

Hello Robert, Thanks for writing in. The hydraulic ports on the Replacement Leg #E93VV use 6 SAE JIC 37-degree flare fittings with 9/16"-18 threads. This is the most common hydraulic fitting used on trailer landing gear and leveling jacks, so if…

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Answer 5

Hi Wade, Yes, you’ve definitely got some good options to get away from hand cranking, and I totally get wanting something easier, especially with a cattle trailer. A lot of cattle trailers are gooseneck style and use a square center-mounted jack like…

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Answer 6

If the shackles are flipping the wrong direction frequently that typically means the leaf springs are too short, the hanger spacing is too big, or the shackles are too short. Most of the time it's somebody changed leaf springs and just went with…

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Answer 7

The Lubrimatic marine wheel bearing grease you mentioned #L54FR uses a calcium sulfonate base. Grease that uses that type of base is indeed compatible with lithium complex grease, according to the compatibility chart you mentioned. To see the chart,…

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Answer 8

Hey Luis, welcome back! The Atlas IV Double-Acting Hydraulic Trailer Jack item #ST73FR does not have a specific hardware kit available for it. You'll need a total of eight Grade 8, 1/2" diameter bolts to complete the installation. The length…

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Does Atlas IV Double-Acting Hydraulic Trailer Jack # ST73FR Come with Fluid

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