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The bearing seat is the structural cradle that holds the differential inside the rear axle housing. It carries the differential bearings, positions the ring gear relative to the pinion, and absorbs the torque reaction that tries to rotate the entire differential under load. When its bores wear or its flange distorts, the differential shifts, gear mesh opens, and the rear axle howls under acceleration.
We are Shaanxi Tolizer Machinery Equipment Co., Ltd., a supplier of heavy-duty truck and axle components for Shacman, TONLY, SINOTRUK, LiuGong, and FAW distributors and workshops worldwide.
Our DZ90149320043 Bearing Seat replaces the original Hande component. It is the rear axle main reducer bearing seat for the Hande HDZ300 / TGX axle. Fits Shacman X3000 and Kamaz 6580 / 65801 / 65802. Weight: 18 kg. Also referenced as HD90149320043.
Choosing this bearing seat means choosing a precision-machined support that holds the differential rigid against torque reaction and restores correct gear mesh.
Product Detail Image:
Surface Treatment: Ductile iron casting, machined bearing bores, ground mounting flange. Protective coating for storage.
Manufacturing Process: Cast, CNC-machined in one setup for concentricity. Bores bored and honed; flange ground flat. Inspected for bore diameter, flange flatness, thread integrity.
Structure Diagram: Cast body with two bearing bores supporting differential carrier bearings, mounting flange bolting to axle housing, machined face positioning differential at correct depth. Works with adjusting washers (DZ90149320033/20035/20034/20032/20031) to set preload and backlash.
Installation Position: Bolts inside rear axle housing. Supports differential carrier. Adjusting washers set ring gear backlash to 0.25–0.40 mm (variation ≤0.10 mm) and pinion preload to 1–2 N·m at flange.
Product Principle: The bearing seat rigidly supports the differential carrier. Torque reaction tries to rotate the differential inside the housing. The bearing seat absorbs this force through its flange and bores. If bores wear or flange distorts, the differential shifts, gear mesh changes, and the axle howls under acceleration. Adjusting washers set exact ring gear position relative to pinion.
Diagnostic Note: Howling loudest during acceleration, quieter during coast — bearing seat bores worn, differential shifting away from pinion. Vibration increasing with speed and load — flange distorted or bolts loose. Oil leak at bearing seat flange — flange distorted or gasket failed. Cannot set correct backlash or contact pattern — bores misaligned or flange not perpendicular. Metal debris in oil — bores worn, bearings spinning. Before replacing, check axle housing flange condition and differential carrier bearings/gears.
Rear axle howling under acceleration on a Shacman X3000 or Kamaz 6580? Check bearing bores and flange. If worn or distorted, this bearing seat is the fix. Send truck model, axle model, symptoms. We will confirm DZ90149320043 as correct fit for your Hande HDZ300 rear axle and respond with pricing, lead time, and bore inspection data.
Contact Tolizer today to secure your bearing seat supply.
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