Dexter 12K Power Jack – Hydraulic Trailer Jack Add-On Kit

Dexter 12K Power Jack – Hydraulic Trailer Jack Add-On Kit

The Dexter 12K Power Jack Add-On Kit is designed for trailers that already have a compatible hydraulic power unit and need to add push-button hydraulic jack operation. This kit includes a Dexter 12K hydraulic trailer jack, selector valve, hydraulic hoses, fittings, and hardware for adding a single hydraulic jack to an existing hydraulic trailer system.

This add-on kit is a strong option for dump trailers, gooseneck trailers, equipment trailers, livestock trailers, horse trailers, cargo trailers, car haulers, construction trailers, flatbed trailers, and custom trailer builds where manual crank jacks are slow, difficult, or impractical.

What’s Included

• (1) Dexter 12K hydraulic trailer jack with 2″ x 20″ hydraulic cylinder
• (6) 48″ hydraulic hose assemblies with straight #6 JIC fittings
• (8) Straight adapter fittings – #6 SAE male x #6 JIC male
• (1) Selector valve with aluminum handle
• (1) Jack cover

Key Features

• 12,000 lb Support Capacity: Designed for heavy-duty trailer support applications. This refers to the jack’s static support rating.
• 10,000 lb Lift Capacity: Provides strong hydraulic raising power when connected to a compatible hydraulic power unit.
• Add-On Kit with Selector Valve: Designed to add a hydraulic trailer jack to an existing compatible hydraulic system, such as a dump trailer hydraulic power unit.
• 20″ Travel Range: Offers a wide operating range for trailer hookup, leveling, and support.
• Large 9-1/2″ x 9-1/2″ Footplate: Helps spread the load and improve stability on gravel, dirt, job sites, and uneven ground.
• Heavy-Duty 4″ x 4″ Outer Tube: Rugged square-tube construction designed for demanding trailer and job site use.
• 3-Year Manufacturer Warranty: Backed by Dexter’s manufacturer warranty for dependable long-term performance.

Designed for Existing Hydraulic Trailer Systems

This Dexter | Premium Supply Power Jack add-on kit is intended for trailers that already have a compatible hydraulic power unit. The included selector valve allows hydraulic flow to be routed between the trailer’s existing hydraulic function and the hydraulic trailer jack, depending on the installation setup.

This style of add-on kit is commonly used on dump trailers with an existing hydraulic pump and dump bed system where customers want to add hydraulic jack operation without installing a second dedicated hydraulic power unit.

If you need a complete system with pump and controls, Johnson Trailer Parts also offers Dexter 12K Power Jack hydraulic trailer jack kits, 12K kits with chargers, and 12K kits with KTI dual double-acting pumps.

Trailer Applications

Dexter | Premium Supply hydraulic Power Jacks are commonly used on heavy-duty trailers where manual crank jacks are slow, difficult, or impractical.

• Dump trailers
• Gooseneck trailers
• Equipment trailers
• Livestock and horse trailers
• Cargo trailers
• Car haulers
• Construction trailers
• Flatbed trailers
• Custom trailer builds and hydraulic trailer upgrades

Fitment Note

Proper frame height is critical for fitment and operation. The vertical distance from the bottom of the jack foot to the underside of the trailer frame should not exceed 8″. Always verify trailer frame height, mounting location, hydraulic system compatibility, hose routing, selector valve placement, and installation requirements before ordering.

Specifications

• Brand: Dexter | Premium Supply
• Product Line: Power Jack
• Jack Type: Hydraulic trailer jack
• Configuration: Single add-on kit with selector valve
• Support Capacity: 12,000 lb static support capacity
• Lift Capacity: 10,000 lb hydraulic lift capacity
• Travel: 20″
• Retracted Bracket Height: 30-3/4″
• Extended Bracket Height: 50-3/4″
• Footplate Size: 9-1/2″ x 9-1/2″
• Outer Tube Size: 4″ x 4″
• Maximum Hydraulic Flow: Up to 2 GPM
• Maximum Raise / Extend Pressure: 3,200 PSI
• Maximum Lower / Retract Pressure: 1,500 PSI
• Recommended Fluid: Dexron III ATF for normal operating conditions
• Manufacturer Part Number: PJS-12-20-ADS-K
• Warranty: 3-year manufacturer warranty

Installation Manual

• ⇓ Download Dexter 12K Hydraulic Trailer Jack Manual

Important Notes

• This listing is for the single hydraulic trailer jack add-on kit with selector valve.
• This add-on kit is intended for trailers with an existing compatible hydraulic power unit.
• The maximum distance from the bottom of the jack foot to the underside of the trailer frame should not exceed 8″.
• Professional installation is recommended for hydraulic and electrical trailer systems.

Frequently Asked Questions

What is this add-on kit used for?

This kit is designed to add a Dexter 12K hydraulic trailer jack to a trailer that already has a compatible hydraulic power unit. The selector valve allows hydraulic flow to be directed to the jack when needed.

Does this kit include a hydraulic pump?

No. This is an add-on kit for trailers that already have a compatible hydraulic power unit. If you need a complete hydraulic trailer jack system with pump and controls, see the Dexter 12K Power Jack hydraulic trailer jack kit.

What hydraulic fluid should I use?

For normal operating conditions, Dexron III ATF is recommended for this hydraulic trailer jack system. In extremely cold operating environments, a synthetic aircraft-rated hydraulic fluid may be required. MIL-H-83283 is commonly recommended for extreme cold applications. Always confirm fluid requirements for your climate and hydraulic setup before servicing the system.

Does this jack self-level the trailer?

No. This jack does not automatically self-level the trailer. It provides hydraulic lifting and lowering, but trailer leveling must still be controlled by the operator.

What is the difference between support capacity and lift capacity?

The 12,000 lb rating refers to the jack’s support capacity, while the 10,000 lb rating refers to hydraulic lifting capacity. Support capacity is the static load the jack is designed to support, while lift capacity is the load the hydraulic system is designed to raise.

Can this kit be used with a dump trailer hydraulic pump?

Yes, this style of add-on kit is commonly used with compatible dump trailer hydraulic systems. Always verify hydraulic pressure, flow, reservoir capacity, selector valve routing, and installation requirements before connecting the jack to an existing hydraulic system.

Related Dexter Power Jack Options

Need a different hydraulic trailer jack setup? Compare our Dexter 12K single and 24K dual Power Jack options below:

• Dexter 12K Power Jack – Hydraulic Trailer Jack
• Dexter 12K Power Jack – Hydraulic Trailer Jack Kit with KTI Hydraulic Pump
• Dexter 12K Power Jack – Hydraulic Trailer Jack Kit with KTI Hydraulic Pump and Chargers
• Dexter 12K Power Jack – Hydraulic Trailer Jack Kit with KTI Dual Double-Acting Pump
• Dexter 24K Dual Power Jacks – Hydraulic Trailer Jacks
• Dexter 24K Dual Power Jacks – Hydraulic Trailer Jack Add-On Kit

Why Buy from Johnson Trailer Parts?

Johnson Trailer Parts supplies genuine Dexter | Premium Supply hydraulic trailer jack products for trailer builders, repair shops, farms, contractors, and trailer owners who need dependable hydraulic lifting solutions.

Choosing the wrong jack or mismatched hydraulic setup can create installation problems and added cost. If you are unsure whether you need a jack-only replacement, add-on kit, complete kit, or dual jack setup, contact us before ordering and we can help match the right Dexter Power Jack system to your trailer.

Need help choosing the right hydraulic trailer jack setup? Call Johnson Trailer Parts at (602) 292-9690 for expert fitment support.