The 50 fifth-wheel is the core coupling component for HOWO MAX 4X2 tractors.
A robust 50 fifth-wheel ensures safe and stable connection between tractor and semi-trailer.
This genuine HOWO 50 fifth-wheel is engineered to handle extreme loads on African roads.
When you choose authentic Howo Parts, the 50 fifth-wheel delivers OEM grade quality and precision fit.
The 50 traction base assembly (150mm JSK35DVS) is the main fifth-wheel unit in this kit.
This assembly includes the cast steel top plate, locking mechanism, and mounting bracket for 50mm king pins.
It features JOST type single lock hook design with 150mm installation height.
The JSK35DVS series is optimized for light weight while maintaining structural strength and towing capacity.
The hex bolt with serrated flange M16*1.5 secures the fifth-wheel to the tractor chassis frame.
These bolts use a fine pitch M16 thread with integrated serrated flange that bites into the mounting surface.
Twelve bolts are included to distribute clamping force evenly across the fifth-wheel base plate.
The serrated flange eliminates the need for separate lock washers and prevents loosening under vibration.
The hexagon toothed nut with flange M16*1.5 works together with the bolt to complete the fastening set.
Each nut features a toothed flange on the bearing face that provides positive locking action.
Twelve nuts match the bolt quantity, ensuring every mounting point has matched hardware.
This bolt and nut combination achieves consistent torque retention even on rough terrain.
The spare tire rack assembly (335 pitch circle / For tractor) mounts the spare wheel behind the cab.
It has a 335mm bolt circle pattern that fits standard HOWO tractor wheel hubs.
This assembly positions the spare tire securely, keeping it accessible yet out of the way.
The rack is fabricated from heavy gauge steel with corrosion resistant coating for long life.
50 fifth-wheel – complete coupling kit for HOWO MAX 4X2 tractor
| Material Encoding | Name |
|---|---|
| WG9525930001 | 50 traction base assembly (150mm JSK35DVS) |
| ZQ1811645TF6 | Hex bolt with serrated flange M16*1.5 |
| ZQ32516T13F6 | Hexagon toothed nut with flange M16*1.5 |
| WG9900860010 | Spare tire rack assembly (335 pitch circle / For tractor) |
This 50 fifth-wheel handles vertical loads up to 20 tons and tows a total gross weight of 65 tons. D value is 152kN, meeting international heavy transport requirements.
Single lock hook design with secondary safety catch prevents accidental release. The mechanism engages the 50mm kingpin positively with audible lock confirmation.
Matched M16x1.5 bolts and toothed flange nuts create a vibration proof clamp. The serrated flanges bite into steel surfaces, eliminating loosening over time.
The included spare tire rack keeps a replacement wheel readily available. Its 335mm pitch circle fits standard HOWO tractor wheels perfectly.
The JSK35DVS series fifth-wheel is specifically developed for the Chinese and African truck markets.
It uses a cast steel top plate with machined flat bearing surface for smooth articulation.
The 150mm installation height provides optimal clearance for most semi-trailer kingpin heights.
This assembly weighs approximately 124kg, balancing strength with weight efficiency.
Grease fittings at four points ensure easy lubrication of wear components.
The 50 fifth-wheel is designed to bolt directly onto HOWO MAX 4X2 frame rails.
The mounting pattern matches factory drilled holes, requiring no modifications.
This assembly is also compatible with HOWO MAX 6X4 and 8X4 models.
For older HOWO tractors, check frame rail spacing before ordering.
The spare tire rack fits tractors with standard 5×150mm or 6×190mm wheel bolts.
These bolts are manufactured from medium carbon steel with heat treatment to property class 10.9.
The thread pitch is fine M16x1.5, providing better resistance to vibration loosening.
Each bolt has a hex head height of 12mm and wrench size of 24mm.
The integral serrated flange has a diameter of 28mm with radial teeth that embed into the steel.
Recommended torque is 210 to 240 Nm for proper clamp load without stripping.
These nuts are formed from high strength steel with a phosphated or zinc plated finish.
The flange toothing matches the bolt serrations, creating a positive lock under compression.
Nut height is 14mm with a 24mm hex drive, allowing the same tool for both bolt and nut.
The locking action remains effective through multiple installation cycles.
Always replace nuts if the toothed flange becomes worn or flattened.
The rack is fabricated from 6mm thick steel plate with reinforced gussets.
A winch type hoisting mechanism lowers the spare tire for easy removal.
The 335mm bolt circle matches standard HOWO 11R22.5 and 12R22.5 wheel patterns.
A ratchet locking pin secures the rack in the raised position during travel.
The assembly holds tires up to 13R22.5 in size with appropriate clearance.
Position the traction base assembly on the chassis frame using the factory alignment marks.
Insert the 12 hex bolts with serrated flange through the mounting holes.
Thread the 12 toothed flange nuts onto the bolts and tighten by hand.
Use a torque wrench set to 220 Nm in a crossing pattern to avoid distortion.
Mount the spare tire rack to the chassis crossmember using the existing bolt holes.
Raise the spare wheel into the rack and engage the locking pin for transport.
Inspect the fifth-wheel locking mechanism every 50,000 kilometers for proper operation.
Apply lithium based grease to the top plate and locking mechanism every 20,000 km.
Check the hex bolts and toothed nuts for any signs of loosening or rust.
Tighten any loose fasteners to the recommended torque of 220 Nm.
Inspect the spare tire rack mechanism for cable wear or corrosion annually.
Replace the 50 fifth-wheel if the top plate shows grooving deeper than 2mm.
The locking mechanism should be replaced if the kingpin gap exceeds 3mm.
Hex bolts must be replaced if threads are damaged or serrations are flattened.
Toothed flange nuts are single use on critical safety applications; replace each time.
The spare tire rack winch cable should be replaced if any individual wires are broken.
Aftermarket fifth-wheels often use lower grade castings that crack under load.
Generic bolts may not have the correct heat treatment, leading to bolt stretch or fracture.
The JSK35DVS genuine assembly is certified for D value 152kN and vertical load 20 tons.
Counterfeit fifth-wheels may lack the safety secondary lock.
Using genuine HOWO parts ensures compliance with safety regulations in Nigeria and ECOWAS region.
This 50 fifth-wheel is designed for ISO 337 standard 50mm kingpins.
The jaws accept both standard and cross type kingpin designs.
Not compatible with 90mm (3.5 inch) kingpins without jaw replacement.
For operators using mixed trailer fleets, order the 90mm conversion jaw separately.
The 50 fifth-wheel meets UN ECE R55 and Chinese GB/T 31879 standards.
It is certified for hazardous material transport (ADR) with optional sensor package.
The JSK35DVS series complies with ISO 3842 dimensional requirements.
Certification documents are available for fleet inspection and regulatory compliance.
The complete 50 fifth-wheel kit includes all four line items listed in the parameter table.
Individual components can be ordered separately using the material encoding numbers.
The spare tire rack is supplied as a complete assembly with all mounting hardware.
For bulk orders of 10 or more kits, contact the dealer for volume pricing and drop shipping.
Store the 50 fifth-wheel assembly indoors in a dry area to prevent corrosion.
The hex bolts and toothed nuts should remain in sealed poly bags until installation.
Do not stack heavy items on top of the fifth-wheel to avoid warping the top plate.
The spare tire rack assembly must be stored horizontally to prevent cable damage.
Q: Can this 50 fifth-wheel be used with 90mm kingpin trailers?
A: No, a jaw replacement kit is required for 90mm kingpin compatibility.
Q: What torque for the M16 bolts?
A: 210 to 240 Nm using a calibrated torque wrench on clean, lubricated threads.
Q: Is the spare tire rack suitable for all tire sizes?
A: Fits 11R22.5 and 12R22.5; 13R22.5 requires checking clearance.
Q: How often should the fifth-wheel be greased?
A: Every 20,000 km or monthly in heavy use conditions.
Investing in a genuine 50 fifth-wheel reduces coupling related downtime and accidents.
The matched bolt and nut set prevents loosening, reducing daily pre trip checks.
Quick release spare tire rack saves time when changing flats on the roadside.
A reliable fifth-wheel also improves resale value of the HOWO MAX 4X2 tractor.
Fleet owners who standardize on genuine HOWO fifth-wheels report lower operating costs.
The 50 fifth-wheel is manufactured in ISO 14001 certified facilities.
Cast steel components are 100 percent recyclable at end of service life.
The packaging uses recycled cardboard and plastic materials where possible.
Genuine HOWO parts support sustainable transport maintenance practices.
Each 50 fifth-wheel kit includes a printed installation instruction sheet.
Torque specifications and grease points are clearly marked on the illustration.
Dealer support is available via telephone for installation questions.
Keep the original packaging with batch number for warranty claims.
The warranty covers casting defects and material flaws for 12 months.
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