Can Stand Alone Single Acting Hydraulic Pump Be Used For Stillwell Hydraulic Trailer Jack?

Updated 09/09/2025 | Published 05/14/2025

Products Featured in This Question

Atlas IV Single-Acting 10K Hydraulic Trailer Jack w/ Connection Kit for Dump Trailer - 39"

(19)

$784.25

Atlas IV Hydraulic Trailer Jack - Direct Weld - 10K

(19)

$522.50

Tradesman Hydraulic A-Frame Trailer Jack - 7K

$380.00

3,000-psi Hydraulic Pump for Stillwell Jacks

(2)

$475.00

Question:

Can this jack be used with single acting hydraulic pump? I dont have a pump on my trailer but I want a hydraulic jack like this since its more capable than electric or manual jacks usually.

asked by: Sean

Expert Reply:

Hey Sean, yes you can definitely use a stand alone system like a single-acting hydraulic pump to power a hydraulic trailer jack like the single action Stillwell lineup we just started carrying. For the Stillwell Atlas IV 10K Hydraulic Trailer Jack w/ Connection Kit for Dump Trailers - 39" # ST67VR you were looking at, you can use 3,000-psi Hydraulic Pump for Stillwell Jacks # ST93FR. This has an inlet line port, and an outlet line port for the jack. It works by supplying pressure to raise the jack, then gravity lets it lower back down.

This pump will also work for other single action Stillwell jacks like:
-Stillwell Atlas IV 10K Hydraulic Trailer Jack w/ Connection Kit for Dump Trailers - 39" # ST67VR
-Stillwell Tradesman Hydraulic A-Frame Trailer Jack - 7K # ST76FR
-Stillwell Atlas IV Hydraulic Trailer Jack - Direct Weld - 10K # ST23FR

expert reply by: Andrew N

Angelo

9/6/2025

Hey Andrew, I have a single acting pump for my dump trailer (pwr up gravity down) there are 6x ports on the selector valve. Can u show me or explain where i'm supposed to put the 4x hoses i have 1x hose from the dump cylinder 1x hose from the pump to the selector switch 2x hoses from the hydraulic jack what do i do with the other 2x ports ? cap them off ? I cant find anything online that shows a diagram

Andrew N.

9/8/2025

@Angelo Hey Angelo, can you try sending a picture to this email? [email protected] It's hard to say without looking at it. And even then, you may still need to get ahold of the company that manufactures it. Do you have any idea what brand or model the setup could be? I could try to do some research after having that info. That said, from what I can tell, you will need to cap off any unused ports. It sounds like you'd want to run the lines as follows: Hose from the dump cylinder goes to one work port (A) on the selector valve. Hose from the pump goes to the P (Pressure/Inlet) port on the selector valve. Two hoses from the hydraulic jack go to the other work ports (B and B’) on the selector valve. (unless it's a single acting jack, then you'd run one line to it, and then the other line from the jack goes to the tank/return). Tank/Return (T) ? must be connected back to the reservoir (not capped). cap off any unused ports, but make sure you never cap off anything important like the P for pressure/inlet, or the T for tank return.

Angelo

9/8/2025

@AndrewN ok i sent the photos to the email you provided. I just read above the jack will power up gravity down, which is exactly what mine is doing. The problem i have is how is the jack going to retract back up into itself after u get the trailer onto the vehicle pulling it. You can’t just drive away the cylinder will bend or break off. I need the jack to be able to power up all the way. I was screwed after i put it on the truck. I stuck a pry bar under the foot of the jack and while pressing the down button with one hand the other hand pulled up on the pry bar so the pressure would go back into the tank. I was trying to make it easier on myself and this is worse then the old fashion way just wind it up with the crank.

Andrew N.

9/9/2025

@Angelo Yeah that's unfortunate Angelo. Sorry you're dealing with that, but the dump trailer jacks like that are designed for a heavy dump bed to bring it back down. The only way you can do that on your setup is with a double acting jack. If you want to go that route, let me know and I can try to narrow down the right one for you. Again, sorry you didn't have the outcome you were hoping for. That's never fun. :(