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Bulldog
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Always the correct part
We know our products
Quality Products
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Complete kit bundle containing all necessary components for your project. Professional-grade components designed for reliable performance and long-lasting durability.
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: | 1550101344 |
| WARRANTY: | LIMITED 5 YEAR WARRANTY |
| WEIGHT: | 10.2 LBS |
| CAPACITY: | 3,000 LBS. W/O CASTER |
| TRAVEL: | 13 IN. |
| RETRACTED: | 7 IN. |
| EXTENDED: | 20 IN. |
| CLEARANCE: | 14.25 IN. |
| MODEL NUMBER: | SWL 155 X |
| HANDLE STYLE: | SIDEWIND |
| MATERIAL: | STEEL |
| WHEEL: | NO |
| ATTACHED WHEELS: | NO |
| CYLINDER DIAMETER: | 2.25 IN. |
| SPEEDY LIFT: | NO |
| COLOR: | SILVER |
Keywords: BD1550101344-10PK bundle kit, complete kit, professional components, industrial kit, BD1550101344, BULLDOG
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 ground clearance. This manual covers multiple mounting styles (bolt-on, snap ring, bolt-thru, direct-mount weld-on, A-plate, and pivot tube) and crank types (side-wind and top-wind), with optional drop foot, drop leg, and caster wheel configurations. The jack is designed for vertical loading only.
No. The manual explicitly states: 'These jacks are not designed for mounting to round tongues.' You must have a flat or rectangular tongue for proper installation.
The gap between the mounting bolts and the tongue must not exceed 1/16 inch (1.5 mm). This applies to bolt-on mounting brackets. If the gap is larger, the mounting will not be secure and the jack may not function properly.
No. A-plate jacks are designed specifically for mounting to trailers with A-plate couplers only. If your trailer has a different coupler type, you will need a different jack mounting style.
Bolt-on jacks include supplied bolts that correspond to your tongue width, and locknuts for securing the mounting bracket. The manual does not specify the exact quantity or size of bolts included, only that they are supplied and must be torqued to 25 ft. lbs.
For A-plate jacks, you need three 3/8-16 grade 5 bolts with washers to bolt the jack A-plate to the coupler. If welding is required, an AWS certified welder must perform all welding work. A support plate is recommended for the bottom of the tongue and must be welded with a 3/16 inch fillet weld.
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. Check for clearance of the handle, trailer light cables, and coupler. After installation is complete, check for interference again.
1) Place the gear housing on the tongue and insert the supplied bolts in 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. 4) Check for clearance of the handle, trailer light cables, and coupler.
1) Place the jack bracket over the mount. 2) Place the snap ring in the groove. 3) 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. 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.
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. This is a permanent installation and requires professional welding.
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 using 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, torqued 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.
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.
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 heavy duty casters, use 4 3/8 inch bolts, washers, and locknuts as shown in the manual diagram.
For side-wind models: 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 top-wind models: 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.
Torque all mounting bolts to 25 ft. lbs. This applies to both bolt-on rack jacks and bolt-on mounting brackets.
Torque the three 3/8-16 grade 5 bolts with washers to 15-20 ft. lbs. when bolting the jack A-plate to the coupler.
All weld-on installations require a 3/16 inch fillet weld. This applies to direct-mount, A-plate, and pivot tube installations. All welding must be performed by an AWS certified welder.
Fully retract and rotate the jack before towing. If using an optional drop foot or caster, always remove the drop foot or caster before towing to maximize ground clearance.
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 1-800-632-3290 or www.cequentgroup.com.
No. These jacks are designed for vertical loading only. Excessive side forces may cause jack failure and must be avoided.
Never position any part of your body under any portion of the product or the load being supported. Secure the load, vehicle, and trailer from rolling by blocking the wheels when operating the jack or coupling the trailer. Do not allow children to play on or around the product or the load being supported. Before manually moving the trailer, crank the jack to the lowest position.
When using the 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. Always remove the drop foot or caster before towing to maximize ground clearance.
Make certain the pivot pin is fully inserted through both sides of the pivot tube and the pivot mount before using the jack.
If this product is a swivel jack, lock the plunger pin into a hole in the mounting bracket before raising or lowering the tongue.
No. If this product is a rack jack, do not raise the gear housing above the inner tube. Doing so may damage the jack.
The following procedures should be performed at least annually: For side-wind models, apply a small amount of automotive grease to the internal gearing and apply a 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 a 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.
For top-wind models, apply a lightweight oil to the screw stem. This should be done at least annually.
If the product is used in a marine environment, flush the jack assembly and bushings with fresh water, and apply fresh lubricant. This should be done 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 1-800-632-3290. Please specify the product model number.
No. These jacks are not designed for mounting to round tongues. You must have a flat or rectangular tongue.
No. A-plate jacks are designed for mounting to trailers with A-plate couplers only.
No. Bolt-on jacks use supplied bolts and locknuts; no welding is required. Welding is only required for weld-on mounting styles (direct-mount, A-plate, and pivot tube).
Only if you are installing a weld-on model (direct-mount, A-plate, or pivot tube). Bolt-on and snap ring models do not require welding.
Torque all mounting bolts to 25 ft. lbs.
Yes. Always remove the optional drop foot or caster before towing to maximize ground clearance.
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.
The snap ring may not be fully seated in the groove. Inspect the snap ring groove and remove any debris. Seat the snap ring fully into the groove. If the snap ring is damaged or the groove is damaged, replace the part before using the jack.
The locknut may not be tight enough. Tighten the locknut until there is little movement in the bushing. Ensure the bolt is installed between the trailer tongue and mount, and the jack bracket is held by the bushing between the locknut and the mount.
The internal gearing and bushings may need lubrication. For side-wind models, apply a small amount of automotive grease to the internal gearing by removing the jack cover or using a needle nose applicator on the lubrication point near the crank. Rotate the jack handle to distribute the grease evenly. Perform this maintenance at least annually.
The jack may need lubrication. For side-wind models, apply automotive grease to the internal gearing and lightweight oil to the handle unit. For top-wind models, apply lightweight oil to the screw stem. If the jack is still difficult to crank after lubrication, or if parts are bent, broken, or worn, replace those parts before using the jack.
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