24K Dual Hydraulic Trailer Jack Kit with Dual Double Power Unit – Dump & Jack Combo
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We offer the following methods of delivery:
- Same day Freight Shipping when ordered Mon-Fri before 12pm central time. (excluding holidays)
- Pickup from our Mandeville, Louisiana warehouse
- In some cases, free shipping - please contact us: sales@primarymover.com or call 985-888-6554
One power unit for your double-acting dump bed and two hydraulic jack legs
The Primary Mover 24K Dual Hydraulic Trailer Jack Kit with Dual Double Power Unit combines two individually rated 12,000 lb jack legs with a 12V, 3 HP / 2.2 kW power unit designed to control a compatible double-acting dump circuit and a double-acting jack circuit.
The included 15-foot, four-button wired pendant provides separate commands for dump raising/lowering and jack extension/retraction. A hydraulic flow divider distributes the jack-circuit flow between the two legs for coordinated movement.
Dual Double power unit, four-button pendant and Group 31 battery tray included. Battery not included. The trailer’s dump cylinder and dump-body hardware are separate.
- Two 12K hydraulic jack legs, each with a 20-inch hydraulic stroke.
- Two double-acting hydraulic circuits: one for the dump system and one for the jack pair.
- Primary Mover 12V power unit with a 3 HP / 2.2 kW motor.
- 15-foot, four-button pendant for separate dump and jack commands.
- Hydraulic flow divider with a listed 1–5 GPM operating range.
- Dual counterbalance valves on each jack.
- Stainless steel caps, galvanized inner sleeves and hot-dip galvanized feet.
- Six 48-inch hydraulic hoses and the fittings listed below.
- Group 31 battery tray included.
- Bolt-on or weld-on mounting choices.
- 12-month limited jack warranty, subject to warranty terms.
Dump and jack control from one Dual Double power unit
Dual Double describes the power unit’s two double-acting hydraulic functions. One circuit supplies powered raising and lowering for a compatible dump cylinder. The other supplies powered extension and retraction for the jack pair through the included flow divider.
The four-button pendant provides a pair of commands for each function. The two jack legs share the jack circuit; the pendant does not provide separate left-leg and right-leg controls.
Identify the pendant commands, actual movement directions and hydraulic connections during installation before operating under load. This package supplies the power unit and jack system; it does not establish the lifting capacity of your dump body.
A separate 3 HP hydraulic power unit
The included Primary Mover unit uses a 12V motor rated at 2.2 kW, approximately 3 horsepower. Mount it in a suitable dry, weather-protected location with access for installation and service.
Motor power, delivered flow at working pressure, cylinder dimensions, valve configuration and electrical supply all affect operating speed. Jack-circuit flow is shared between two legs, so do not assume the same travel speed as a single-jack system.
Learn how hydraulic power-unit size, pressure and flow affect jack performance .
What the hydraulic flow divider does
The included flow divider distributes incoming oil between the two jack branches to help coordinate cylinder movement. Its listed operating range is 1–5 GPM.
Flow distribution does not establish equal pressure, equal supported load or perfect matching of leg height. Actual movement depends on operating flow, divider accuracy, cylinder condition, plumbing and loads.
This is not an automatic leveling system. Monitor both legs and the trailer, provide suitable footing and follow the installation and operating instructions.
Dual counterbalance valves on each jack
Each jack has dual counterbalance valves for load-control functions on both cylinder sides. They help resist unintended retraction while supporting the trailer and unintended extension when the legs are retracted for travel.
During lowering, the trailer’s weight can try to drive cylinder movement faster than the pump supplies oil. Counterbalance valves control outgoing oil to help manage that load-driven movement. Their function is separate from the flow divider’s job of distributing flow.
The jack valves control the jack cylinders. The dump circuit requires the load-control arrangement appropriate for its own cylinder or hoist.
Read why dual counterbalance valves matter on hydraulic trailer jacks .
Premium construction on both jack legs
- Painted 4-inch-square steel outer tubes.
- Stainless steel caps for corrosion-resistant top components.
- Galvanized inner sleeves to protect the exposed moving sections.
- Hot-dip galvanized feet for corrosion protection at the ground-contact components.
- Rigid hydraulic piping on the cylinders; external hookup hoses are included.
- Grade 8 hardware for applicable mounting connections.
What the dual-jack dump-and-jack combo includes
- Two 12,000 lb hydraulic trailer jack assemblies, each with a 20-inch stroke, dual counterbalance valves and your selected bolt-on or weld-on configuration
- One Primary Mover 12V Dual Double hydraulic power unit with a 3 HP / 2.2 kW motor
- One 15-foot, four-button wired pendant for dump and jack control
- One hydraulic flow divider with a listed 1–5 GPM operating range
- Six 48-inch hydraulic hoses with straight JIC-6 connections
- One JIC-6 tee fitting
- Two 90-degree SAE-6-to-JIC-6 adapter fittings
- Nine straight SAE-6 male to JIC-6 male adapter fittings
- Two 4-gauge battery cables
- One Group 31 battery tray
Not included: battery, dump cylinder, dump-body hardware or optional transition adapters. The listed hoses serve the jack installation; confirm any additional hoses and fittings needed for your dump circuit and that the supplied lengths suit your trailer.
Dual-jack Dual Double kit specifications
| Jack assemblies | Two individually rated 12,000 lb legs |
|---|---|
| Package designation | 24K: combined individual ratings, subject to installation limits |
| Hydraulic stroke | 20 inches per leg |
| Included power unit | Primary Mover 12V Dual Double, 3 HP / 2.2 kW motor |
| Hydraulic functions | Two double-acting circuits: dump and jack pair |
| Hydraulic work ports | Four, SAE-6 |
| Remote | 15-foot wired, four-button pendant |
| Flow divider | Listed operating range: 1–5 GPM |
| Jack load-control valves | Dual counterbalance valves on each leg |
| Hydraulic hoses | Six 48-inch hoses with straight JIC-6 connections |
| Outer jack tubes | 4-inch square, painted steel |
| Mounting choices | Bolt-on or weld-on |
| Battery tray | Group 31 tray included |
| Battery included | No |
| Recommended fluid | Non-synthetic ATF, following product instructions |
Match both jack legs to the load and mounting structure
The 24K designation is the sum of two individual 12,000 lb jack ratings. It does not guarantee a 24,000 lb lifting capacity for every installation. Neither leg may exceed its own rating.
Trailer geometry, load position, footing and mounting arrangement determine how much load each leg carries. Do not assume each jack supports half the load. The jack rating also does not establish dump-body lifting capacity or increase trailer GVWR and other component ratings.
Compare mounting dimensions, complete retracted and extended heights, coupling height and stowed clearance with your trailer. Bolt-on installations require a compatible pattern and suitable structural support. Weld-on installations require appropriate support and welding for the intended load.
Compatible bolt-on transition plates may provide additional mounting options. These adapters are sold separately.
Choose the correct hydraulic package
This Dual Double kit is intended for a compatible double-acting dump system and double-acting jack circuit. Check the dump cylinder, working pressure, flow, reservoir capacity and connections before choosing the installation.
If your dump cylinder uses a conventional single-acting, power-up/gravity-down circuit, contact us to configure the appropriate power unit and dual-jack system. If you plan to retain an existing single-acting power unit, the X-Block guide explains the directional-control principle; a two-leg setup also needs suitable plumbing and flow distribution.
To retain an existing compatible double-acting power unit, compare our 24K Dual-Jack Add-On Kit . Use the Jack Kit Selector to compare packages.
Dual-jack dump-and-jack combo questions
Does this kit include a power unit and remote?
Yes. It includes one Primary Mover 12V Dual Double power unit with a 3 HP / 2.2 kW motor and a 15-foot, four-button wired pendant. A Group 31 battery tray is included; the battery is separate.
What does Dual Double mean with two jack legs?
The power unit has two double-acting circuits. One serves the dump system; the other serves the two jack legs through a flow divider. The pendant controls dump and jack functions, rather than each leg independently.
Are the legs individually rated for 24,000 lb?
No. Each leg is rated for 12,000 lb. The 24K package designation is the sum of their individual ratings, subject to load distribution and complete installation limits.
Does the flow divider automatically level the trailer?
No. It distributes hydraulic flow to help coordinate the legs. It does not guarantee equal leg height, equal supported loads or automatic leveling.
Do both jack legs have dual counterbalance valves?
Yes. Each jack has dual counterbalance valves for load-control functions on both cylinder sides. Read the counterbalance guide .
Does this package include a dump cylinder or hoist?
No. It supplies the two jack assemblies, Dual Double power unit and listed components. The dump cylinder or hoist, dump-body hardware and any additional dump-circuit plumbing are separate.
Manual, warranty and demonstration
- Download the Primary Mover 24K Hydraulic Trailer Jack Manual
- Browse product manuals and documentation
- View warranty coverage and terms
- Learn about hydraulic jack power units, pressure and flow
Need help matching the kit to your trailer? Call 985-888-6554 or email sales@primarymover.com with photos of your dump cylinder, hydraulic connections and planned jack mounts. You can also compare hydraulic trailer jacks and kits .