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The rear spring seat sliding block is the wear pad between the leaf spring and the spring seat on the HDZ300 tandem axle. It lets the spring slide as the suspension flexes. When it wears thin, the spring contacts the seat directly — grinding a groove into the leaf, causing breakage and changing the axle pinion angle. The HD90129520107 is the rear sliding block for Shacman F3000, X3000, M3000, HOWO, and TONLY mining vehicles with HDZ300 axles.
We are Shaanxi Tolizer Machinery Equipment Co., Ltd., a supplier of heavy-duty chassis and suspension components for Shacman, TONLY, SINOTRUK, LiuGong, and FAW distributors worldwide.
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Surface Treatment: High-strength wear-resistant material. Contact face machined smooth. Resists mud, grit, and water in the suspension area.
Manufacturing Process: Cast or machined, finished on spring contact face and mounting face. Contact surface smoothed to reduce friction. Mounting holes machined to match spring seat. Inspected for thickness, finish, hole position.
Structure Diagram: Flat rectangular pad with smooth top face, mounting bottom face, locating holes. Bolts to spring seat DZ9114520617 (left) or DZ9112520306 (right) on balance shaft housing DZ91259525035. Sits between seat and leaf spring.
Installation Position: Mounts on rear spring seat. Leaf spring seats on top. Spring slides along block as suspension compresses. Two blocks per seat typically — one each side of center bolt.
Product Principle: Leaf spring changes length as it flexes. Sliding block provides low-friction surface. When block wears thin, spring contacts metal seat — grinding a groove, concentrating stress, causing leaf breakage. Worn block also lets spring shift, changing pinion angle.
Diagnostic Note: Watch for: Metallic grinding over bumps — block worn through, spring contacting seat. Wear groove in leaf spring — spring must be replaced if deep. Axle shifting or driveline vibration — worn block lets spring shift, changing pinion angle. Leaf breakage at center bolt — spring binding instead of sliding. Uneven rear tire wear — axle misaligned. Before replacing, check spring groove and seat distortion.
Grinding noise from rear suspension on a Shacman F3000 or X3000? Check leaf spring for wear groove and seat for distortion. If block worn thin or grooved, this block is the fix. Send truck model, axle configuration, symptoms. We will confirm HD90129520107 as correct rear spring seat sliding block and respond with pricing, lead time, and thickness inspection data.
Contact Tolizer today to secure your sliding block supply.
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