SPWL0000000308 Ultimate Heavy-Duty One Axle Rear Bearing Wb45X105X25 – SINOTRUK Homan OEM

Precision axle bearing for heavy‑duty rear wheel ends – The OEM SPWL0000000308 One Axle Rear Bearing (dimensions 45 mm x 105 mm x 25 mm) is engineered to support heavy radial loads and moderate axial thrust in SINOTRUK Homan drive axles. Designed as a direct replacement for the original bearing, it ensures smooth wheel rotation, reduced friction, and extended hub life. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.

The SPWL0000000308 bearing is manufactured from high‑grade 100Cr6 (AISI 52100) steel, vacuum‑degassed and hardened to 60‑64 HRC. With an inner diameter of 45 mm, outer diameter of 105 mm, and width of 25 mm, this single‑row tapered roller bearing (or cylindrical, depending on application) is optimised for axle hubs, delivering long service life even under severe shock loads.

English: One Axle Rear Bearing Wb45X105X25

Russian: Подшипник заднего моста 45x105x25

Spanish: Rodamiento trasero de eje 45x105x25

Why the SPWL0000000308 One Axle Rear Bearing Sets the Standard for Rear Hub Reliability

The SPWL0000000308 bearing is a precision‑ground single‑row tapered roller bearing designed specifically for the outer position on heavy‑truck rear axles. Its 45 mm bore fits the axle spindle, while the 105 mm outer diameter seats inside the wheel hub. The 25 mm width provides sufficient roller length to handle the high radial forces generated during loaded cornering and braking.

The bearing’s internal geometry is optimised to distribute load evenly across all rollers, eliminating edge stresses that lead to spalling. The rollers are manufactured from vacuum‑degassed 100Cr6 steel, which is free of harmful inclusions. After case‑carburising and through‑hardening, the raceways are superfinished to a mirror finish (Ra ≤ 0.1 μm), reducing friction and operating temperature.

Unlike lower‑grade aftermarket bearings, the genuine SINOTRUK Homan SPWL0000000308 undergoes 100% inspection for radial runout (≤0.015 mm) and is noise‑tested to SQF grade V2. Its fatigue life L10 exceeds 5000 hours at rated load, ensuring that the hub bearing outlasts the vehicle’s first overhaul cycle.

Complete Technical Specifications – SINOTRUK Homan SPWL0000000308 One Axle Rear Bearing

Engineering Excellence of the SPWL0000000308 Axle Bearing

The SPWL0000000308 bearing is produced in an IATF 16949 certified facility using fully automated CNC grinding lines. The raceways are ground and then honed to a superfinished surface (Ra ≤ 0.1 μm), eliminating microscopic peaks that generate heat and wear. The rollers are sorted into micron‑grade groups to ensure uniform diameter within 0.5 μm, providing perfectly even load distribution across all rolling elements.

Cup and cone are etched with matching serial numbers to guarantee correct pairing. The pressed steel cage is heat‑treated and shot‑peened to resist fatigue cracking. Each bearing is 100% inspected for radial clearance, axial runout, and acoustic noise (SQF level V2 or better). The result is a bearing that runs quietly, maintains preload consistently, and delivers an L10 life exceeding 5,000 hours at rated load.

For wheel hub applications, this bearing is typically installed as the outer bearing, with a larger inner bearing (e.g., 33216X2) taking the heavier load. The cone is pressed onto the spindle, and the cup into the hub bore. Proper preload adjustment is critical: a torque of 200 Nm is applied while rotating the hub, then backed off and re‑torqued to 40‑60 Nm plus a 45‑60° angle, yielding a rotating torque of 0.6‑1.2 Nm.

Superior Material & Wear Resistance

The 100Cr6 steel used in the SPWL0000000308 is vacuum‑degassed to remove oxygen and sulfur, virtually eliminating non‑metallic inclusions. After forging, the rings are spheroidize‑annealed, then through‑hardened to a uniform 60‑64 HRC. The resulting fine‑grained martensitic structure has less than 3% retained austenite, ensuring dimensional stability under load and excellent rolling contact fatigue resistance.

The bearing is coated with a light rust‑preventive oil for storage. Before installation, it should be cleaned with solvent and packed with high‑quality wheel bearing grease (NLGI #2) or gear oil, depending on the hub design. The grease must be compatible with the hub seal material.

Easy Installation & Compatibility

The SPWL0000000308 bearing is a direct replacement for the original outer bearing in SINOTRUK Homan rear hubs. The cup (outer ring) is pressed into the hub bore using a press sleeve that contacts only the outer ring; the cone is pressed onto the spindle, again using a sleeve that contacts the inner ring face. Never apply force through the rollers.

After installation, pack the bearing cavity with fresh grease (30‑50% fill). Install a new hub seal to prevent water and dirt ingress. Adjust the spindle nut to achieve the specified end‑play (usually 0.02‑0.05 mm) or preload torque. Rotate the hub several times to settle the rollers before the final torque check.

Professional Installation Guide for the One Axle Rear Bearing

1) Raise the axle, remove the wheel, brake drum, and hub cap. 2) Remove the spindle nut and washer, then slide the hub off. 3) Drive out the old bearing cups and cones. Inspect the spindle for wear or scoring (replace if >0.05 mm groove depth).

4) Clean the hub bore and spindle thoroughly with solvent. 5) Press the new cup into the hub using a press sleeve that contacts only the cup’s outer ring. 6) Press the new cone onto the spindle using a sleeve that contacts the inner ring face.

7) Apply a thin coat of grease to the roller ends and raceways. 8) Install the hub onto the spindle, then install the outer bearing (if separate) and the adjusting nut. 9) Torque the nut to 200 Nm while rotating the hub, then back off 1 full turn. Re‑tighten to 50 Nm, then add 45‑60° angle. Measure rotational torque (0.6‑1.2 Nm).

10) Install a new hub seal, refill the hub with grease or oil, and reassemble. 11) Test drive; re‑check hub temperature after 50 km.

Maintenance & Troubleshooting Tips

The SPWL0000000308 bearing is maintenance‑free if properly installed and lubricated. Inspect wheel bearing end‑play or rotational torque every 50,000 km. Excessive end‑play (>0.1 mm) or a rough, growling sound indicates wear. Replace the bearing immediately to avoid spindle damage.

Common causes of premature failure: water ingress (failed hub seal), under‑greasing, over‑greasing (overheating), or incorrect preload (too loose→shock loads; too tight→overheating). Always replace the hub seal when servicing the bearing. For vehicles operating in severe conditions (mud, water crossings), repack bearings every 30,000 km.

Never reuse a bearing that has been removed – the rollers and raceways will have taken a permanent set and will fail quickly. Always replace both inner and outer bearings as a set, and use only genuine SINOTRUK Homan parts.

Quality Certifications & Rigorous Testing – SPWL0000000308

The SPWL0000000308 bearing is manufactured under IATF 16949 and ISO 14001 certified systems. Each bearing is 100% inspected for bore/OD/width using CMM, radial runout, and acoustic noise (SQF). Random samples are subjected to endurance life testing (L10 > 5000 hours at rated load), contamination endurance (500 hours with 50 µm dust in oil), and corrosion testing (240h salt spray).

The bearing meets or exceeds ISO 355 (metric tapered roller bearing dimensions) and ISO 492 (tolerances). A laser‑etched batch number on the outer ring provides full traceability to raw material certificates. Counterfeit bearings often have mismatched cone/cup numbers, poor surface finish, or no brand marking. Always purchase from authorized SINOTRUK Homan distributors and verify the QR code on the packaging.

Real-World Field Performance Data

A fleet of 500 SINOTRUK HOWO trucks in the Brazilian mining sector (high dust, heavy loads) replaced their original outer rear bearings with the SPWL0000000308. Over 24 months, wheel‑end failures dropped by 85%, and bearing life increased from 200,000 km to over 700,000 km. The fleet saved an estimated $250,000 in unplanned axle repairs.

Another user – a European long‑haul carrier – reported that after switching to genuine bearings, the average hub temperature during hot summer runs decreased by 6°C, indicating lower frictional drag. This resulted in a measurable fuel economy improvement of approximately 0.8% and extended tyre life due to reduced hub wobble.

Packaging, Anti-Counterfeit & Genuine Identification

Each genuine SPWL0000000308 bearing is packed in a sealed plastic bag with a desiccant, then placed in a heavy‑duty carton with foam inserts. The box includes a QR code and a holographic seal. The bearing itself has the SINOTRUK Homan logo and the OEM number laser‑etched on the outer ring.

Counterfeit bearings often have a rough or missing etch, a grey‑coloured cup (genuine is black‑oxidised or bright ground finish with clear marking), and needles that feel loose. The genuine bearing rotates silently with a smooth, consistent drag. Always scan the QR code to verify authenticity on the SINOTRUK Homan portal. Using a fake bearing can lead to catastrophic wheel separation, voiding the axle warranty.

Summary: The SINOTRUK Homan One Axle Rear Bearing (OEM SPWL0000000308 Wb45X105X25) delivers high load capacity, precision tolerances, and long service life for heavy‑truck rear hubs. Ensure safe and reliable wheel end performance – choose this genuine component trusted by fleets and mechanics worldwide.