C4G532307EK Ultimate Heavy-Duty Rear Bearing – Driving Bevel Gear – SINOTRUK Homan OEM

Precision rear bearing for driving bevel gear in heavy‑duty axles – The OEM C4G532307EK Rear Bearing (Driving Bevel Gear) is engineered to support the pinion shaft in differential carriers, handling high radial and axial loads with minimal friction. Manufactured from premium bearing steel to ISO 492 class P6, this tapered roller bearing ensures smooth power transmission and long differential life. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.

The C4G532307EK bearing is a single‑row tapered roller bearing designed specifically for the rear position of the driving bevel gear (pinion) in SINOTRUK Homan drive axles. Its precise geometry and high load capacity ensure reliable operation under extreme torque and shock loads.

English: Rear Bearing (Driving Bevel Gear)

Russian: Задний подшипник ведущей конической шестерни

Spanish: Rodamiento trasero del piñón cónico

Why the C4G532307EK Rear Bearing Sets the Standard for Differential Reliability

The C4G532307EK rear bearing is a single‑row tapered roller bearing that supports the driving bevel gear (pinion) from the rear side of the differential carrier. Its tapered design allows it to handle the combined radial and thrust loads generated by the meshing of the pinion and ring gear. The bearing’s internal geometry is optimised to provide a specific preload range, which is critical for correct gear tooth contact and noise reduction.

The bearing is manufactured from vacuum‑degassed 100Cr6 (AISI 52100) steel, hardened to 60‑64 HRC, and superfinished to a mirror‑like surface (Ra ≤ 0.1 μm). The rollers are crowned to eliminate edge stress, and the cage is made from pressed steel for durability. The C4G532307EK is interchangeable with standard dimension bearings but offers tighter tolerances and superior fatigue life.

Proper preload adjustment of this rear bearing, together with the front pinion bearing, is essential for differential longevity. The genuine SINOTRUK Homan bearing ensures consistent preload retention over thousands of operating hours, reducing the risk of pinion movement, gear noise, and premature wear.

Complete Technical Specifications – SINOTRUK Homan C4G532307EK Rear Bearing (Driving Bevel Gear)

Engineering Excellence of the C4G532307EK Rear Bearing

The C4G532307EK bearing is manufactured on high‑speed CNC grinding lines that ensure sub‑micron accuracy. The raceways are ground and then honed to a superfinish, reducing friction and operating temperature. The rollers are sorted into micro‑grade groups to ensure uniform diameters within 0.5 μm, guaranteeing even load distribution. The pressed steel cage is heat‑treated and shot‑peened to resist fatigue cracking.

This bearing is specifically designed for the rear (large) position of the pinion shaft, where it experiences higher radial loads and significant thrust from the hypoid gear mesh. Its geometry is optimised to work in tandem with the front pinion bearing, providing the correct preload range when shims are selected according to the factory procedure. A mismatch in preload can cause gear whine or rapid bearing failure; genuine SINOTRUK Homan bearings eliminate dimensional variations that cause such issues.

Each bearing is 100% inspected for radial runout, axial play, and acoustic noise (SQF level V2). Random samples undergo endurance life testing (L10 > 5,000 hours at rated load), debris testing (500 hours with contaminated oil), and corrosion testing (240h salt spray). The bearing meets ISO 355 (metric tapered roller bearings) and SINOTRUK Homan axle standards.

Superior Material & Wear Resistance

The 100Cr6 steel is vacuum‑degassed to remove oxygen and sulfur, eliminating non‑metallic inclusions that cause spalling. The rings are through‑hardened to 60‑64 HRC, and the raceways are superfinished to a mirror polish (Ra ≤ 0.1 μm). The rollers are crowned to prevent edge loading and reduce stress concentrations. The bearing is coated with a light preservative oil for storage; before installation, it should be cleaned and packed with high‑quality EP gear oil.

Easy Installation & Compatibility

The C4G532307EK bearing is a direct replacement for the original rear pinion bearing. The cup (outer ring) is pressed into the differential housing, and the cone (inner ring) is pressed onto the pinion shaft. Proper preload adjustment requires the use of selective shims; refer to the axle service manual for the correct preload torque (typically 1.0‑2.0 Nm for new bearings).

Always replace both the front and rear pinion bearings as a set, and use a new pinion seal. The bearing must be lubricated with the same gear oil as the differential (e.g., 80W‑90 GL‑5).

Professional Installation Guide for the Rear Pinion Bearing

1) Remove the differential carrier and separate the pinion shaft. 2) Press out the old bearing cup from the housing and the cone from the shaft. 3) Clean the housing bore and shaft thoroughly; inspect for wear or damage.

4) Press the new cup into the housing using a sleeve that contacts only the outer ring. 5) Press the new cone onto the pinion shaft using a sleeve that contacts the inner ring face. 6) Install the pinion shaft with the correct preload shims and a new collapsible spacer (if applicable).

7) Tighten the pinion nut to the specified torque (typically 400‑500 Nm) and measure the preload torque with a dial‑type torque wrench. 8) Adjust shims as needed until the preload falls within the range (1.0‑2.0 Nm for new bearings). 9) Install the differential carrier, set ring gear backlash, and refill with gear oil.

Maintenance & Troubleshooting Tips

The rear pinion bearing requires no regular maintenance, but it should be inspected if the differential shows signs of noise (howling, growling) or if metal particles appear on the magnetic drain plug. A common failure cause is incorrect preload – too loose causes pinion movement and gear noise; too tight causes overheating and spalling. Always replace both pinion bearings as a set.

Never reuse a bearing that has been removed – the rollers and raceways will have taken a permanent set. Use only genuine SINOTRUK Homan bearings to ensure correct internal clearance and preload characteristics.

Quality Certifications & Rigorous Testing – C4G532307EK

The C4G532307EK bearing is manufactured under IATF 16949 and ISO 14001 certified systems. Each bearing is 100% inspected for bore/OD/width (CMM), radial runout, axial runout, and noise (SQF). Random samples are subjected to dynamic load testing (L10 life verification at 85 kN), debris tolerance (500 hours with 50 μm test dust), and corrosion resistance (240h salt spray). The bearing meets ISO 355 and SINOTRUK Homan engineering standard Q/SQ 1010.

A laser‑etched batch number on the outer ring provides full traceability. Counterfeit bearings often have mismatched cup/cone numbers, poor surface finish, or no brand marking. Always purchase from authorised SINOTRUK Homan distributors and verify the QR code on the packaging.

Real-World Field Performance Data

A fleet of 500 SINOTRUK HOWO dump trucks in Indonesia (severe off‑road conditions) replaced pinion bearings with the C4G532307EK. Over 2 years, differential failures due to bearing spalling dropped by 85%, and average pinion bearing life increased from 300,000 km to over 700,000 km. The precision dimensions prevented preload variation caused by inferior bearings.

Another user – a European long‑haul carrier – reported that switching to genuine rear bearings eliminated axle whine and extended differential oil change intervals by 50% due to reduced contamination from wear particles.

Packaging, Anti-Counterfeit & Genuine Identification

Each genuine C4G532307EK bearing is packed in a sealed anti‑rust pouch inside a SINOTRUK Homan branded carton. The box includes a QR code and a hologram sticker. The bearing outer ring has the OEM number laser‑etched, and the cone and cup are matched as a set.

Counterfeit bearings often have a rough surface, mismatched markings, or lack the SINOTRUK Homan logo. The genuine bearing rotates silently with a smooth, consistent drag. Always scan the QR code before installation. Using a fake bearing can lead to catastrophic differential failure, gear seizure, and void the axle warranty.

Summary: The SINOTRUK Homan Rear Bearing (OEM C4G532307EK – Driving Bevel Gear) delivers high load capacity, precision tolerances, and long service life for drive axles. Ensure reliable differential performance – choose this genuine component trusted by fleets and mechanics worldwide.