JOST A440
Product Overview
The JOST A440 is a heavy-duty trailer landing gear from JOST's Magnum series, and its core selling point is five-year maintenance-free operation. It is specifically designed for high-frequency drop-and-hook operations, cold-climate operation, and fleets that want to "install it and never worry about it again." Through a fully sealed structure and pre-filled grease, it completely eliminates the need for regular greasing that traditional landing gear requires.
Hardcore Specifications
The load-bearing capacity of the A440 is very solid among comparable products. Below are the core data officially rated:
Maximum Static Load: 170,000 lbs (approx. 77 tons). This is the load-bearing limit when the trailer is properly supported.
Rated Lift Capacity: 62,500 lbs (approx. 28 tons). Tested at a crank input torque of 100 ft-lbs.
Side Load: 33,000 lbs per set. Strong resistance to lateral thrust.
Gear Ratio: High speed 3.5 turns/inch, low speed 32 turns/inch. High speed is for quickly dropping the gear to the ground; low speed is for lifting under heavy load.
Common Travel: Mainly 17 inches and 19 inches, corresponding to different mounting height requirements.
Five Major Technical Highlights
The A440's maintenance-free and high-durability performance relies on the following targeted designs:
Grease-Filled Gearbox: The internal gearbox is completely filled with low-temperature grease at the factory. This ensures continuous lubrication and fundamentally prevents moisture and road chemicals from entering the gearbox and causing corrosion.
Grease Tube Wrapping the Screw: The lifting screw is completely wrapped by a grease tube. Each time the landing gear extends or retracts, the screw automatically receives a fresh coating of grease - essentially self-servicing while in use.
Fully Sealed Landing Gear: The landing gear itself and all shaft ends are equipped with seals to keep moisture out. This is the key to achieving five-year maintenance-free operation.
Austempered Ductile Iron Gears: The gears are made of austempered ductile iron, which offers excellent strength and wear resistance. The official claim is that they "will not wear out."
Double "D" Shaft Design: This design eliminates torque on the bolts, so the cranking force is transmitted directly into the gearbox without being wasted on turning bolts, making cranking easier.
Structural Details and Model Interpretation
10-Bolt Mounting Pattern: Compared to designs with fewer bolts, the 10-bolt mounting provides higher mounting rigidity, making the connection between the landing gear and the trailer frame more secure.
Bottom Reinforcement Band: A reinforcement band is added at the bottom of the upper housing, further enhancing overall strength.
Model Naming Convention: Take A440R.G3.17 as an example: R stands for Gear Side (the side with the crank); G3 corresponds to a specific configuration code; 17 stands for 17-inch travel. The corresponding non-crank side usually starts with L, such as A440L.G.19.
Foot Types: Common options include the 10"x10" Cushion Foot and the Sand Shoe, corresponding to paved road and soft ground applications respectively.
| Item | Specification |
|---|---|
| Model | JOST A440 Magnum 5-Year Maintenance-Free Landing Gear |
| Rated Lifting Load | 28 Ton / pair |
| Static Load Capacity | 80 Ton / pair (170000 lbs) |
| Lateral Load Capacity | 14.9 Ton / pair (33000 lbs) |
| Transmission Type | Internal sealed gearbox, left-right synchronous linked lifting |
| Operation Mode | Single-side hand crank with two-speed (High / Low) |
| High Speed | 3.5 turns per inch stroke (approx. 0.72 mm per rotation) |
| Low Speed | 32 turns per inch stroke (approx. 0.08 mm per rotation) |
| Optional Effective Lifting Stroke | 355mm(14") / 430mm(17") / 480mm(19") |
| Main Material | 60000PSI high-strength low-alloy rectangular steel tube; Gear: Austempered ductile iron |
| Surface Treatment | Black primer, galvanizing & powder coating optional |
| Mounting Flange | 10-bolt reinforced mounting flange |
| Base Plate Type | Standard S flat base plate, optional T-type sand shoe |
| Applicable Trailer Types | Container skeletal semi-trailer, tank semi-trailer, low-bed heavy haul semi-trailer, long-distance drop-and-hook semi-trailer |
| Installation | Bolted or welded on trailer gooseneck main beam
FAQQ: Who are we? A: YALONG'S headquarters is located in Shandong, China. Since 2018, we have been selling to Africa (30.00%), South Asia (20.00%), Southeast Asia (20.00%), Middle East (20.00%), and domestic market (10.00%). There are about 11-50 people in our office. Q: why should you buy from us not from other suppliers? A: We adhere to the business philosophy of "quality first, customer first" and have won the trust and support of domestic and foreign customers with excellent product quality, good service attitude, and reasonable sales prices. The main export countries and regions are: Africa, Southeast Asia, Central Asia, South America and other places. We have a professional design and development team that can design and develop a car that is more suitable for you according to your needs; rich export experience, familiar with the export procedures and required certifications of various countries, and can deliver your car to you faster; We With first-class production equipment, strong technical force and advanced testing methods, we can provide you with more stable and reliable vehicles. Q: How is your after-sales service technical team? A: Not only are we a trading company, but we have a team of engineers and professional maintenance staff who have been working in the field of construction machinery for nearly 20 years. We can provide you with online service support in a timely manner, or send it to the China Manufacturing network for support when needed.
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