500180 — Topwind crank
6¾-inch-radius crank with red Bulldog grip for specified 150, 160 and 170 Series topwind jacks.
View Bulldog 500180Bulldog Trailer Jack Parts: Crank, Swivel Mount, Foot & Drop Leg
A trailer jack can need a new handle, mounting bracket, ground foot or drop leg without needing a completely new jack. The important part is identifying which jack series and connection style you have. Bulldog replacement parts that look similar can serve different functions and are not interchangeable simply because the trailer is the same size.
Find the replacement part by its job
| Bulldog number | Component | What to check |
|---|---|---|
| 500180 | Topwind crank | Confirm the jack uses a topwind crank; a sidewind jack requires a different handle. |
| 500240 | Weld-on male swivel mount | Match the mount geometry and pin size to the existing 170 Series jack assembly before welding. |
| 500244 | Removable foot with pin | Measure the actual inner jack tube and check its retention-hole arrangement, not only the jack capacity. |
| 500377 | A-frame drop leg and pin | Check the inner tube, hole spacing, and jack model; other Bulldog and competitor A-frame versions are not interchangeable by appearance. |
Replacement parts and product photos
500240 — Weld-on male swivel mount
Unpainted steel weld-on male mount for the Bulldog 170 Series swivel-jack arrangement using a ⅝-inch pull pin.
View Bulldog 500240500244 — Removable foot with pin
Zinc-coated steel foot for compatible 2-inch-inner-tube trailer jacks rated from 2,000 to 5,000 lb; includes the retaining pin.
View Bulldog 500244500377 — A-frame drop leg and pin
Zinc-finished drop leg and pin for compatible A-frame jacks, including Bulldog A-frame jacks with the specified thin-wall inner tube.
View Bulldog 500377Identify your Bulldog jack before ordering
- Read the jack identification. Find the Bulldog series or stamped model number, then compare it with the replacement part. Jacks with similar capacities can use different mounting systems.
- Identify the winding mechanism. A topwind crank fits at the top of the jack; a sidewind handle operates from the side. Bulldog 500180 is a topwind replacement, not a general sidewind crank.
- Inspect the mount. For a swivel jack, match both sides of the rotating bracket and the pull-pin diameter. Bulldog 500240 is a weld-on male mounting part intended for a specified 170 Series arrangement.
- Measure the lower tube. The removable 500244 foot requires a compatible 2-inch inner tube. Compare the tube size, retaining-pin position and ground clearance to the current assembly.
- Check the drop-leg arrangement. Bulldog 500377 is an A-frame drop leg and pin, not the same part as the removable 500244 foot. Verify the jack construction and the hole locations before buying.
Why the foot and drop leg are different
The 500244 foot connects at the bottom of a compatible jack tube to spread the load at the ground. The 500377 drop leg fits into an A-frame jack as a movable lower section, giving a different type of adjustment and retention. Use the correct part for the jack’s original design; neither number identifies a universal replacement for every Bulldog jack.
Factory part identification
Bulldog publishes individual factory part views and specifications for the 500180 crank, 500240 swivel mount, 500244 removable foot and 500377 drop leg. Compare the factory component view to your actual jack before ordering replacement hardware.
For the complete jack structure, mounting method and safe operation, use the instructions supplied for your particular jack model.
Installation and inspection tips
Stabilize the trailer appropriately before removing or changing any load-bearing jack part. Welding a jack mount must be performed with the correct attachment method and structural precautions. Check pin engagement, handle operation, jack travel and ground clearance before towing or lifting again. A damaged jack, mount or retaining hole should be repaired or replaced before use.
Looking at other trailer support systems? See our A-frame topwind and sidewind jack reference and Stromberg Carlson electric jack parts diagram.
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