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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: | 620057 |
| WARRANTY: | LIMITED 5 YEAR WARRANTY |
| WEIGHT: | 18.1 LBS |
| CAPACITY: | 7,000 LBS. |
| FOOT PLATE SIZE: | 8 IN. X 6 IN. |
| COLOR: | SILVER |
| TRAVEL: | 15 IN. |
| MATERIAL: | STEEL |
| ATTACHED WHEELS: | NO |
| CLEARANCE: | 6.4 IN. |
| CYLINDER DIAMETER: | 2.26 IN. |
| EXTENDED: | 31 IN. |
| FINISH: | ZINC |
| FOOT LENGTH: | 8 IN. |
| HANDLE STYLE: | SIDEWIND |
| FOOT WIDTH: | 6 IN. |
| MODEL NUMBER: | 7 SM -15-0 W/P&C |
| PULL PIN DIAMETER: | 0.625 IN. |
| SPEEDY LIFT: | NO |
| RETRACTED: | 16 in. |
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 and uncoupling from the tow vehicle. The manual covers multiple types: rack jacks, side-wind and top-wind models, and optional drop foot or caster wheel configurations. The jack is cranked to raise or lower the tongue and must be fully retracted and rotated before towing.
The manual covers five mounting styles: (1) Bolt-on rack jacks, (2) Bolt-on mounting brackets, (3) Snap ring or bolt-thru models, (4) A-plate mounting (for trailers with A-plate couplers, available in bolt-on or weld-on), and (5) Direct-mount weld-on. Weld-on pivot tube mounting is also available for round and square pivot tubes. The correct style depends on your trailer type and coupler design.
No. The manual explicitly states: "These jacks are not designed for mounting to round tongues." Jacks are designed for flat or rectangular trailer tongues. If you have a round tongue, contact Cequent Performance Products at 1-800-521-0510 or www.cequentgroup.com for alternative solutions.
No. Bolt-on jacks must match the correct mounting hole pattern for your specific tongue size. The gap between the mounting bolts and the tongue must not exceed 1/16 inch. Before purchasing or installing, confirm that the bolt-on jack has the correct hole pattern for your trailer's tongue width.
The manual describes maintenance differences between the two types. Side-wind models have internal gearing and bushings that require automotive grease applied through the jack cover or lubrication point near the crank, plus lightweight oil applied to the handle at both sides of the tube. Top-wind models require lightweight oil applied to the screw stem. Both types are available with optional drop foot, drop leg, or caster wheel configurations.
Bolt-on jacks include supplied bolts, locknuts, and a mounting bracket. The exact quantity and specifications depend on the model. For A-plate mounting, you must supply three 3/8-16 grade 5 bolts with washers separately. Always verify that all supplied hardware is present before installation.
Yes. For A-plate mounting, you must supply three 3/8-16 grade 5 bolts with washers. These are not included with the jack. Torque these bolts to 15–20 ft. lbs. when securing the A-plate to the coupler.
The manual does not specify which tools are required for installation. However, bolt-on installations will require a wrench or socket to tighten locknuts to 25 ft. lbs., and weld-on installations require an AWS-certified welder. For A-plate mounting, a wrench is needed to torque 3/8-16 bolts to 15–20 ft. lbs. Contact the manufacturer at 1-800-521-0510 for a complete tool list.
Before installation, you must confirm there will be no interference from the tow vehicle, tongue, ground, or 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. Also verify clearance of the handle, trailer light cables, and coupler.
The manual does not mention disconnecting the battery. No electrical work is involved in tongue jack installation.
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. Verify the correct mounting hole pattern for your tongue size before beginning.
1. Place the jack against the tongue and position the mounting straps on the opposite side. 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. Upper bolts should rest on the top of the tongue; lower bolts should be less than 1/16 inch from the bottom. 3. Secure with locknuts and torque to 25 ft. lbs. 4. Check for clearance of handle, trailer light cables, and coupler. The gap between mounting bolts and tongue must not exceed 1/16 inch.
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. 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.
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 bolts of 3/8 inch with washers and locknuts as shown in the manual. Jack capacity is limited to the lesser of the jack or caster capacity.
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.
For bolt-on installations, no drilling is required; the jack uses existing or pre-drilled holes in the mounting bracket and tongue straps. For weld-on installations, no drilling is required. However, the manual does not address whether holes must be drilled into the tongue itself for any configuration. Contact the manufacturer at 1-800-521-0510 if you are unsure whether drilling is needed 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 purchase the weld-on version of the jack, not attempt to weld the bolt-on model.
For bolt-on installations, no modifications are required if the tongue has the correct hole pattern. For A-plate mounting, it is recommended (but not required) to attach a bottom support plate to the bottom of the tongue. For weld-on installations, welding is performed on the tongue but no cutting or trimming is mentioned. The manual does not describe any other permanent modifications.
All bolt-on installations, including bolt-on rack jacks and bolt-on mounting brackets, must be torqued to 25 ft. lbs. (approximately 3.5 m/kg). This applies to the locknuts securing the bolts.
When bolting the jack A-plate to the coupler, use three 3/8-16 grade 5 bolts with washers and torque to 15–20 ft. lbs. (approximately 2–2.7 m/kg).
All weld-on installations require a 3/16 inch (4.8 mm) fillet weld. This applies to direct-mount, A-plate, and weld-on pivot tube installations. All welding must be performed by an AWS-certified welder.
For direct-mount weld-on installation, 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).
The gap between the mounting bolts and the tongue must not exceed 1/16 inch (1.5 mm). This applies to all bolt-on installations. The lower bolts should be less than 1/16 inch from the bottom of the tongue, and the upper bolts should rest on the top of the tongue.
Before towing, you must fully retract and rotate the jack. If using an optional drop foot or caster, always remove it before towing to maximize ground clearance. Failure to do so may cause interference with the ground or other obstacles.
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.
No. Tongue jacks are designed for vertical loading only. Excessive side forces may cause jack failure and must be avoided. Always apply load vertically.
Never position any part of your body under the jack 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 jack or the load. Minimize movement of the implement while the jack is under load. Before manually moving the trailer, crank the jack to its 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. If using an optional drop foot or caster, always remove it before towing to maximize ground clearance. Never attempt to adjust the drop foot or drop leg when there is any load on the jack.
If your jack is a swivel jack, lock the plunger pin into a hole in the mounting bracket before raising or lowering the tongue. This prevents unintended rotation during operation.
If your jack 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 operating the jack. This ensures the jack is securely attached and cannot separate during use.
No. The manual states: "This product is not intended to be used as a transport device for the implement it is attached to." The jack is designed only for raising and lowering the tongue for coupling and uncoupling. Minimize movement of the implement while the jack is under load.
If your jack is a rack jack, do not raise the gear housing above the inner tube. Doing so may cause damage or failure of the jack. Always operate within the normal range of motion.
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 specification and all pins are fully inserted. Confirm the jack operates smoothly through its full range of motion.
The following procedures should be performed at least annually: For side-wind models, apply automotive grease to the internal gearing and bushings, and lightweight oil to the handle at both sides of the tube. For top-wind models, apply lightweight oil to the screw stem. If equipped with a caster wheel, lubricate the axle bolt and nut assembly with lightweight oil. If 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. This should be done at least annually.
For top-wind models, apply a lightweight oil to the screw stem at least annually. This keeps the screw mechanism operating smoothly.
If the jack is used in a marine environment, flush the jack assembly and bushings with fresh water at least annually, and apply fresh lubricant. This prevents corrosion and salt buildup.
Always replace bent, broken, or worn parts before using the jack. Inspect the jack regularly for signs of damage or wear, especially after heavy use or if the jack has been involved in an accident.
Replacement parts are available through Cequent Performance Products' Customer Service Department at 1-800-521-0510. Use only Cequent Performance Products parts or parts of equal quality for repair. Please specify the product model number when ordering.
Tongue jacks are available in multiple mounting styles: bolt-on, snap ring, bolt-thru, A-plate, direct-mount weld-on, and weld-on pivot tube. Bolt-on models require the correct hole pattern for your tongue width. A-plate models fit only trailers with A-plate couplers. Jacks are not designed for round tongues. Confirm your trailer type and coupler style before purchasing.
Bolt-on models include supplied bolts and locknuts. A-plate models require you to supply three 3/8-16 grade 5 bolts with washers. Weld-on models require an AWS-certified welder. Verify all supplied hardware is present before installation.
Welding is required only for weld-on models: direct-mount, A-plate, and weld-on pivot tube. All welding must be performed by an AWS-certified welder using a 3/16 inch fillet weld. Bolt-on models do not require welding.
Bolt-on installations: torque locknuts to 25 ft. lbs. A-plate installations: torque three 3/8-16 grade 5 bolts to 15–20 ft. lbs. Weld-on installations: use a 3/16 inch fillet weld performed by an AWS-certified welder.
Fully retract and rotate the jack before towing. If equipped with an optional drop foot or caster, remove it before towing to maximize ground clearance. Never tow with the jack extended.
Jack capacity is limited to the lesser of the jack, footplate, or caster wheel capacity. Never exceed the maximum rated capacity. Refer to stamped markings or decals on the product for the rated capacity, or contact Cequent Performance Products at 1-800-521-0510.
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. If used in a marine environment, 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 present, clean the groove thoroughly before attempting to install the snap ring again. Ensure the snap ring is fully seated; it should sit flush in the groove with no gaps.
For bolt-thru models, tighten the locknut until there is little movement in the bushing. Do not over-tighten, as this may damage the bushing. The bolt should be installed between the trailer tongue and mount, with the jack bracket held by the bushing between the locknut and the mount.
The manual does not provide troubleshooting steps for jacks that do not operate smoothly. However, maintenance may help: for side-wind models, ensure the internal gearing and bushings are properly lubricated with automotive grease, and the handle is lubricated with lightweight oil. For top-wind models, ensure the screw stem is lubricated with lightweight oil. If the problem persists, contact Cequent Performance Products at 1-800-521-0510.
Retighten all locknuts to 25 ft. lbs. using a wrench or socket. Check all bolts regularly, as vibration during towing may cause them to loosen over time. If bolts continue to loosen, inspect the bolt holes and mounting bracket for damage or wear.
After installation, check for clearance of the handle, trailer light cables, and coupler. If interference is found, you may need to reposition the jack or adjust the mounting location. Consult the installation instructions for your specific mounting style, or contact Cequent Performance Products at 1-800-521-0510 for guidance.
| Part Number | Model Number | Description | Lift Capacity (lbs.) | Pin (in.) | Handle Style | Travel (in.) | A Retracted (in.) | B Extended (in.) | C Clearance (in.) |
|---|---|---|---|---|---|---|---|---|---|
| 158451 | TWS 158 DTSF w/P&C | Includes Footplate and Male Mating Mount | 2,000 | 9/16 | Topwind | 10.00 | 11.00 | 21.00 | 4.00 |
| 158452 | TWL 158 DTSF w/P&C | Includes Footplate and Male Mating Mount | 2,000 | 9/16 | Topwind | 15.00 | 14.50 | 29.50 | 10.00 |
| 158486 | TWL 158 DTSF w/P&C | Includes Footplate and Male Mating Mount | 2,000 | 9/16 | Topwind | 15.00 | 16.00 | 31.00 | 10.00 |
| 150441 | TWS 150 DTSF w/P&C | Includes Footplate, Clear Zinc Finish | 2,000 | 9/16 | Topwind | 10.00 | 11.00 | 21.00 | 4.00 |
| 158109 | SWS 158 DTSF w/P&C | Includes Footplate and Male Mating Mount | 2,000 | 9/16 | Sidewind | 15.00 | 14.50 | 29.50 | 12.20 |
| 158151 | SWL 158 DTSF w/P&C | Includes Footplate and Male Mating Mount | 2,000 | 9/16 | Sidewind | 10.00 | 11.00 | 21.00 | 8.00 |
| 178101 | TWS 178 DTSF w/P&C | Includes Footplate and Male Mating Mount | 5,000 | 9/16 | Topwind | 10.00 | 11.25 | 21.25 | 6.00 |
| 178109 | TWS 178 DTSF w/P&C | Includes Footplate and Male Mating Mount | 5,000 | 9/16 | Sidewind | 15.00 | 15.20 | 30.50 | 6.20 |
| 178110 | TWS 178 DTSF | Includes Footplate and Male Mating Mount | 5,000 | 9/16 | Topwind | 10.00 | 10.50 | 16.80 | 8.50 |
| 178112 | TWS 178 DTSF | Includes Footplate | 5,000 | 9/16 | Topwind | 10.00 | 10.50 | 16.80 | 8.50 |
| 178151 | TWL 178 DTSF w/P&C | Includes Footplate and Male Mating Mount | 5,000 | 9/16 | Topwind | 15.00 | 14.70 | 29.70 | 10.00 |
| 178201 | SWS 178 DTSF w/P&C | Includes Footplate and Male Mating Mount | 5,000 | 5/8 | Sidewind | 10.00 | 10.40 | 20.80 | 6.40 |
| 178203 | SWL 178 DTSF w/P&C | Includes Footplate and Male Mating Mount | 5,000 | 5/8 | Sidewind | 15.00 | 15.00 | 30.30 | 6.40 |
| 620023 | 5 SM-15-0 w/P&C | Includes Footplate and Male Mating Mount | 5,000 | 5/8 | Sidewind | 15.00 | 15.50 | 30.50 | 6.20 |
| 620057 | 7 SM -15-0 w/P&C | Includes Footplate and Male Mating Mount | 7,000 | 5/8 | Sidewind | 15.00 | 16.00 | 31.00 | 4.65 |
| 198100 | TWS 198 DTSM w/P&C | Includes Footplate and Female Mating Mount | 7,000 | 5/8 | Topwind | 10.00 | 10.80 | 20.80 | 4.50 |
| 198200 | TWL 198 DTSM w/P&C | Includes Footplate and Female Mating Mount | 7,000 | 5/8 | Topwind | 15.00 | 15.80 | 30.80 | 4.25 |
| 198150 | SWS 198 DTSM w/P&C | Includes Footplate and Female Mating Mount | 7,000 | 5/8 | Sidewind | 10.00 | 11.00 | 21.00 | 5.00 |
| 198250 | SWL 198 DTSM w/P&C | Includes Footplate and Female Mating Mount | 7,000 | 5/8 | Sidewind | 15.00 | 16.00 | 31.00 | 5.00 |
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