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Bulldog
Always the correct part
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Always the correct part
We know our products
Quality Products
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BULLDOG round jacks are recognized as the industry standard by leading agricultrual, commercial, horse, livestock, and other trailer manufacturers. For more than three quarters of a centruy, BULLDOG jacks have been demonstrated to be the most reliable, field-proven jacks on the market.
| BRAND: | BULLDOG |
| PART NUMBER: | 151110 |
| WARRANTY: | LIMITED 5 YEAR WARRANTY |
| WEIGHT: | 13.65 LBS |
| CAPACITY: | 2,000 LBS. LIFT, 3,000 LBS. STATIC |
| TRAVEL: | 15 IN. |
| RETRACTED: | 15.8 IN. |
| EXTENDED: | 30.8 IN. |
| CLEARANCE: | 6.45 in. |
| MODEL NUMBER: | SWL 151 DSX |
| HANDLE STYLE: | SIDEWIND |
| MATERIAL: | STEEL |
| FOOT LENGTH: | 7.5 IN. |
| FOOT WIDTH: | 3.9 IN. |
| FOOT PLATE SIZE: | 7.5 IN. X 3.9 IN. |
| WHEEL: | NO |
| ATTACHED WHEELS: | NO |
| CYLINDER DIAMETER: | 2.25 IN. |
| SPEEDY LIFT: | NO |
| COLOR: | SILVER |
Founded in 1920, Bulldog has become the standard for heavy-duty trailer connection hardware in agricultural, military and utility service. The line covers gooseneck hitches and couplers, A-frame and channel-mount trailer couplers with the Wedge-Latch mechanism, and heavy-duty jacks, built for unmatched strength, reliability and safety under demanding loads.
Bulldog was founded in 1920 and has spent more than a century supplying the connection hardware that heavy trailers depend on. Its market has always been the demanding end: agricultural, military and utility applications where a coupler failure is not an inconvenience but a serious incident. The brand summarises its position as Tough and Tested, and it sits within the Horizon Global towing group alongside Reese, Draw-Tite, Fulton, Tekonsha, Bargman and Wesbar.
Gooseneck equipment is the brand's signature. Gooseneck hitches mount in the truck bed over the rear axle, which places the load where the chassis can carry it properly and allows far tighter turning than a receiver hitch permits. Matching gooseneck couplers attach at the trailer end, in round tube and square configurations across the capacity range used by livestock, equipment and flatbed trailers.
The conventional trailer coupler range is built around the Wedge-Latch mechanism, which uses a wedge to take up wear between coupler and ball rather than relying on a fixed clamp that loosens over time. That matters on a trailer accumulating hard miles, where slack in the coupling shows up as noise and shock loading. Couplers are offered in A-frame form for standard tongues and in channel-mount form for straight tongue and fabricated frames, with adjustable channel versions that let a coupler be positioned to suit the tongue height.
Heavy-duty jacks complete the line, sized for the tongue weights that gooseneck and equipment trailers generate. Across the range the emphasis is consistent: forged and heavy-section components, load ratings backed by testing, and hardware specified for agricultural, military and heavy-duty commercial use rather than occasional recreational towing.
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A tongue jack is a device mounted to a trailer tongue that raises and lowers the front of the trailer for coupling, uncoupling, and towing. This manual covers multiple styles: bolt-on rack jacks, snap ring models, bolt-thru models, A-plate jacks, direct-mount (weld-on) jacks, and pivot tube mounts. They are available with side-wind or top-wind handle configurations and optional drop foot, drop leg, or caster wheel attachments.
The manual covers six main mounting styles: (1) Bolt-on rack jacks, (2) Bolt-on mounting brackets, (3) Snap ring models, (4) Bolt-thru models, (5) A-plate jacks (for A-plate couplers only), and (6) Direct-mount (weld-on) or weld-on pivot tube mounts (round and square). Each style has specific installation instructions. A-plate jacks are designed exclusively for trailers with A-plate couplers.
No. The manual explicitly states: "These jacks are not designed for mounting to round tongues." They are designed for flat or rectangular tongues.
No. A-plate jacks are designed exclusively for mounting to trailers with A-plate couplers. The manual states: "A-plate jacks are designed for mounting to trailers with A-plate couplers." If your trailer does not have an A-plate coupler, you will need a different mounting style.
The gap between the mounting bolts and the tongue must not exceed 1/16 inch (1.5 mm). This applies to bolt-on mounting bracket installations. The upper bolts should rest on the top of the tongue, and the lower bolts should be less than 1/16 inch from the bottom of the tongue.
Bolt-on rack jacks include supplied bolts and locknuts for mounting. The exact quantity and size depend on the specific model and tongue width. The manual indicates bolts are inserted into holes corresponding to the tongue width, and the mounting bracket is secured with locknuts.
The manual does not specify standard tools required (such as wrenches or sockets). However, for weld-on installations, an AWS-certified welder is mandatory. For bolt-on installations, you will need tools to tighten bolts and locknuts to the specified torque of 25 ft. lbs. Contact Cequent Performance Products at 1-800-521-0510 for detailed tool requirements for your specific model.
Before mounting the jack, confirm that there will be no interference from the tow vehicle, tongue, ground, and any other mounted accessories while stationary or in motion. Check for interference in all positions, including handle swing and swivel positions if applicable. After installation is complete, check for interference again. Specifically verify clearance of the handle, trailer light cables, and coupler.
Professional installation is required if your jack uses weld-on mounting. All welding must be performed by an AWS-certified welder. For bolt-on installations, you may install the jack yourself if you follow the instructions carefully and have the proper tools. The manual states: "Purchaser/owner must ensure that product is installed according these instructions."
1) Place the gear housing on the tongue and insert the supplied bolts into holes corresponding to the tongue width. 2) Place the mounting bracket below the tongue with the flat surface against the tongue. 3) Secure with locknuts and torque to 25 ft. lbs. Ensure the correct mounting hole pattern for your tongue size, and verify that the gap between mounting bolts and tongue does not exceed 1/16 inch.
1) Place the jack against the tongue and position the mounting straps on the opposite side of the tongue. Align the holes in the mounting bracket with the holes in the mounting straps. 2) Insert the 4 bolts through the mounting bracket and mounting straps. The upper bolts should rest on the top of the tongue; the lower bolts should be less than 1/16 inch from the bottom of the tongue. 3) Secure with locknuts and torque to 25 ft. lbs. 4) Check for clearance of handle, trailer light cables, and coupler. Ensure the correct mounting hole pattern for your tongue size.
1) Place the jack bracket over the mount and place the snap ring in the groove. 2) Seat the snap ring fully into the groove. Before installing the snap ring, inspect the snap ring groove and remove any debris to ensure proper seating.
1) Place the jack bracket into the recessed opening on the mount. 2) Place the small end of the bushing into the jack bracket and onto the bolt. 3) Tighten the locknut until there is little movement in the bushing. Note: The bolt should be installed between the trailer tongue and mount; the jack bracket will be held by the bushing between the locknut and the mount.
For A-plate jacks (bolt-on or weld-on): 1) All welding must be performed by an AWS-certified welder. 2) If the A-plate is separate from the jack, align the jack (and foot, if equipped) with the jack and coupler as desired before welding. Use a 3/16 inch fillet weld. 3) Bolt the jack A-plate to the coupler using three 3/8-16 grade 5 bolts with washers, torque to 15-20 ft. lbs. 4) Weld the recommended support plate to the bottom of the trailer frame using a 3/16 inch fillet weld. 5) If your jack is a plain mount type, it may be mounted directly to a coupler with a 3/16 inch fillet weld. 6) Rack jacks with a similar A-plate incorporated into their design may be attached according to these instructions. It is recommended to attach a bottom support plate to the bottom of the tongue.
1) All welding must be performed by an AWS-certified welder. 2) Place the jack at the desired location. 3) Weld 1 inch in 2 locations on both sides of the jack using a 3/16 inch fillet weld. The same welding instructions apply to other weld-on mounts.
1) All welding must be performed by an AWS-certified welder. 2) The non-beveled side of the pivot tube is welded to the tongue unless otherwise specified on hardware. 3) Place the weld-on pivot tube against the tongue and weld all around with a 3/16 inch fillet weld. Align one set of pivot mount holes vertically. 4) Mate the jack to the pivot tube and secure with the supplied pin. Make certain the pivot pin is fully inserted through both sides of the pivot tube and the pivot mount before using the jack.
To attach a wheel assembly: 1) Insert the long spacer into the wheel. 2) Set the wheel into the caster body and place the bolt through the caster body and wheel. 3) Secure with the nut provided. For a heavy duty caster, use 4 3/8 inch bolts, washers, and locknuts as shown in the manual. Note: Jack capacity is limited to the lesser of the jack or caster capacity.
For a side-wind handle: 1) Insert the long spacer into the roller followed by the thin spacer and the bolt. 2) Secure to the crank stem with the nut provided. For a top-wind handle: 1) Place the washer over the screw stem and then place the handle over the screw stem. 2) Secure the handle to the screw stem with the bolt and nut provided.
Drilling requirements depend on the mounting style. For bolt-on mounting bracket and bolt-on rack jack installations, the manual assumes pre-drilled holes in the tongue and mounting straps. The manual does not explicitly state whether you must drill new holes or use existing ones. For weld-on installations, no drilling is required; welding is used instead. Contact Cequent Performance Products at 1-800-521-0510 if you need clarification on hole drilling for your specific installation.
No. The manual explicitly states: "Do not attempt to weld 'Bolt-On' brackets or straps to the tongue. Special brackets are available for 'Weld-On' applications." If you need a weld-on installation, you must use the special weld-on brackets designed for that purpose.
For bolt-on mounting bracket and bolt-on rack jack installations, torque all locknuts to 25 ft. lbs. This applies to both the upper and lower bolts securing the mounting bracket to the tongue.
For A-plate jacks, bolt the jack A-plate to the coupler using three 3/8-16 grade 5 bolts with washers, torque to 15-20 ft. lbs.
All weld-on installations require a 3/16 inch fillet weld. This applies to direct-mount installations, A-plate installations, and weld-on pivot tube mounts. All welding must be performed by an AWS-certified welder.
For direct-mount (weld-on) installations, weld 1 inch in 2 locations on both sides of the jack using a 3/16 inch fillet weld. This creates four 1-inch weld segments total (two on each side).
Key safety precautions: (1) Never position any part of your body under any portion of the jack or the load being supported. (2) Fully retract and rotate the jack before towing. (3) If using an optional drop foot or caster, always remove it before towing to maximize ground clearance. (4) Do not use the jack as a transport device for the implement it is attached to; minimize implement movement while the jack is under load. (5) Do not allow children to play on or around the jack or load. (6) Secure the load, vehicle, and trailer from rolling by blocking wheels when operating the jack or coupling the trailer. (7) Never exceed the maximum rated capacity. (8) These jacks are designed for vertical loading only; excessive side forces may cause jack failure and must be avoided. (9) Before manually moving the trailer, crank the jack to its lowest position.
The jack capacity is limited to the lesser of the jack, footplate, or caster wheel capacity. Never exceed the maximum rated capacity. Refer to the stamped markings or decals on the product to obtain the rated capacity. If uncertain, contact Cequent Performance Products at 1-800-521-0510 or www.cequentgroup.com.
If using an optional drop foot or drop leg, always remove it before towing to maximize ground clearance. Additionally, if using a drop foot or drop leg, make certain the supplied pin is fully inserted through both sides of the inner tube and the drop tube before using the jack. Never attempt to adjust the drop foot or drop leg when there is any load on the jack.
If the product is a swivel jack, lock the plunger pin into a hole in the mounting bracket before raising or lowering the tongue.
If the product has a pivot tube mount, make certain the pivot pin is fully inserted through both sides of the pivot tube and the pivot mount before using the jack.
No. If the product is a rack jack, do not raise the gear housing above the inner tube. Doing so may cause damage or failure.
After installation is complete, check for interference again in all positions, including handle swing and swivel positions if applicable. Verify clearance of the handle, trailer light cables, and coupler. Ensure all bolts are torqued to the correct specification (25 ft. lbs. for bolt-on installations, 15-20 ft. lbs. for A-plate bolts). Confirm that snap rings are fully seated in grooves, pivot pins are fully inserted, and plunger pins are locked (for swivel jacks).
The following procedures should be performed at least annually: For side-wind models, apply automotive grease to the internal gearing and bushings, and apply lightweight oil to the handle unit at both sides of the tube. If equipped, lubricate the axle bolt and nut assembly of the caster wheel with the same lightweight oil. For top-wind models, apply lightweight oil to the screw stem. If the product is used in a marine environment, flush the jack assembly and bushings with fresh water and apply fresh lubricant.
Apply a small amount of automotive grease to the internal gearing by removing the jack cover, or if equipped, use a needle nose applicator or standard grease gun on the lubrication point found on the side of the jack near the crank. Rotate the jack handle to distribute the grease evenly.
Use automotive grease for the internal gearing and bushings of side-wind models. Use lightweight oil for the handle unit (both sides of the tube) on side-wind models, the axle bolt and nut assembly of caster wheels, and the screw stem on top-wind models. If the product is used in a marine environment, flush with fresh water and apply fresh lubricant.
If the product is used in a marine environment, flush the jack assembly and bushings with fresh water and apply fresh lubricant at least annually.
Always replace bent, broken, or worn parts before using the product. Use only Cequent Performance Products parts or parts of equal quality for repair. Replacement parts are available through Cequent Performance Products Customer Service Department at 1-800-521-0510. Please specify the product model number.
Tongue jacks are available in multiple mounting styles: bolt-on, snap ring, bolt-thru, A-plate (for A-plate couplers only), and weld-on. They are not designed for round tongues. Check your trailer's tongue type and coupler style, then select the appropriate mounting style. For A-plate jacks, your trailer must have an A-plate coupler. Contact Cequent Performance Products at 1-800-521-0510 with your trailer details for fitment confirmation.
Bolt-on installations can be done yourself with proper tools and instructions. Weld-on installations require an AWS-certified welder. All welding must be performed by a certified professional.
Bolt-on mounting: 25 ft. lbs. A-plate bolts: 15-20 ft. lbs. Weld-on installations use 3/16 inch fillet welds performed by an AWS-certified welder.
Fully retract and rotate the jack before towing. Remove any optional drop foot or caster wheel before towing to maximize ground clearance. Crank the jack to its lowest position before manually moving the trailer.
Perform maintenance at least annually. For side-wind models, apply automotive grease to internal gearing and lightweight oil to the handle. For top-wind models, apply lightweight oil to the screw stem. In marine environments, flush with fresh water and apply fresh lubricant.
Before installing the snap ring, inspect the snap ring groove and remove any debris. Seat the snap ring fully into the groove. If debris is preventing proper seating, clean the groove thoroughly and try again.
Tighten the locknut until there is little movement in the bushing. The bolt should be installed between the trailer tongue and mount, and the jack bracket will be held by the bushing between the locknut and the mount. If movement persists after tightening, ensure the bolt is properly positioned and the bushing is fully seated.
For side-wind models, the internal gearing and bushings must be kept lubricated. Apply a small amount of automotive grease to the internal gearing by removing the jack cover, or use a needle nose applicator or standard grease gun on the lubrication point on the side of the jack near the crank. Rotate the jack handle to distribute the grease evenly. For top-wind models, apply lightweight oil to the screw stem. If the problem persists, contact Cequent Performance Products at 1-800-521-0510.
Noise may indicate insufficient lubrication. For side-wind models, apply automotive grease to the internal gearing and lightweight oil to the handle unit at both sides of the tube. For top-wind models, apply lightweight oil to the screw stem. Rotate the jack handle to distribute lubricant evenly. If noise continues, contact Cequent Performance Products at 1-800-521-0510.
First, ensure you have not exceeded the maximum rated capacity. Check the stamped markings or decals on the product for the rated capacity. If the load is within capacity, the jack may have internal damage or wear. Always replace bent, broken, or worn parts before using the product. Contact Cequent Performance Products at 1-800-521-0510 for repair or replacement options.
| Part Number | Model Number | Description | Lift Capacity (lbs.) | Pin (in.) | Handle Style | Travel (in.) | A Retracted (in.) | B Extended (in.) | C Clearance (in.) |
|---|---|---|---|---|---|---|---|---|---|
| 151401 | TWS 151 DS | L-Bend Swivel Bracket Assembled, Includes Footplate | 2,000 | 1/2 | Topwind | 10.00 | 11.00 | 21.00 | 4.00 |
| 151421 | TWL 151 DS | L-Bend Swivel Bracket Assembled, Includes Footplate | 2,000 | 1/2 | Topwind | 15.00 | 14.50 | 29.50 | 10.00 |
| 151464 | TWL 151 DS | L-Bend Swivel Bracket Assembled, Includes Footplate | 2,000 | 3/8 | Topwind | 15.00 | 16.00 | 31.00 | 4.00 |
| 151101 | SWS 151 DS | L-Bend Swivel Bracket Assembled, Includes Footplate | 2,000 | 1/2 | Sidewind | 10.00 | 11.00 | 21.00 | 6.40 |
| 151110 | SWS 151 DSX | L-Bend Swivel Bracket Assembled, Includes Footplate | 2,000 | 3/8 | Sidewind | 15.00 | 15.80 | 30.80 | 6.25 |
| 151159 | SWL 151 DS | L-Bend Swivel Bracket Assembled, Includes Footplate | 2,000 | 1/2 | Sidewind | 15.00 | 14.50 | 29.50 | 12.20 |
| 171401 | TWS 171 DS | L-Bend Swivel Bracket Assembled, Includes Footplate | 5,000 | 1/2 | Topwind | 10.00 | 11.25 | 21.25 | 4.00 |
| 171412 | TWL 171 DS | L-Bend Swivel Bracket Assembled, Includes Footplate | 5,000 | 1/2 | Topwind | 15.00 | 14.50 | 29.50 | 10.00 |
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May 22, 2023
