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The balance shaft cover is the sealing element that closes the balance shaft housing on the tandem axle. Unlike the housing itself, which carries the full suspension load, the cover has one critical job: keep the lubricating oil inside the balance shaft bearing chamber and keep road contamination out. The DZ91259520212 is the right-side cover for Shacman F3000, X3000, and M3000 trucks. It pairs with the left-side cover DZ91259520211 and mounts to housing DZ91259525035. Weight: 2 kg.
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 and workshops worldwide.
Choosing this cover means choosing a correctly machined sealing surface that prevents the oil leaks that destroy balance shaft bearings.
Product Detail Image:
Surface Treatment: Cast from high-strength iron or steel. Sealing face precision-machined to reduce surface roughness. O-ring groove machined into the flange face for positive sealing. External surfaces receive a protective coating.
Manufacturing Process: Cast, then CNC-machined on the sealing face and O-ring groove. The sealing face is ground to a low roughness value — rough surfaces create gaps that allow oil to escape. The O-ring groove is machined to the correct depth and width for the specified seal. Each unit is inspected for face flatness, groove dimensions, and bolt hole position.
Structure Diagram: The cover is a circular or oval plate with a precision-machined sealing face, an O-ring groove around the perimeter, and bolt holes matching the balance shaft housing flange. It closes the right side of the balance shaft bearing chamber and retains the lubricating oil around the balance shaft bushings.
Installation Position: Bolts to the right side of the balance shaft housing (DZ91259525035) on the tandem axle. The sealing face contacts the housing flange, and the O-ring sits in the groove to prevent oil leakage. The cover must be installed with the sealing face clean and the O-ring correctly seated — a pinched or missing O-ring is the most common cause of cover leaks.
Product Principle: The balance shaft rotates inside the housing on spherical bearings that require continuous oil lubrication. The cover seals the bearing chamber at the outboard end. Oil leaking past the cover flange means less oil reaching the bearings — the bearings wear faster, generate heat, and eventually seize or damage the balance shaft. The O-ring seal is the primary defense: it compresses between the cover groove and the housing face, filling any microscopic gaps that would otherwise allow oil to escape. A rough sealing face defeats the O-ring by creating leak paths that the seal cannot bridge.
Diagnostic Note: Watch for: Oil streaks or drips at the cover flange — O-ring failed or cover bolts loose. Oil level in balance shaft chamber dropping without external leak visible — oil is seeping past the cover into the housing area. Balance shaft bearing noise or roughness — oil loss through the cover has starved the bearings. Cover sealing face scratched or corroded — even a new O-ring will not seal. O-ring flattened or hardened — replace every time the cover is removed. Before replacing, check the housing flange for damage.
Oil leaking at the balance shaft cover on a Shacman F3000 or X3000? Check the O-ring condition and cover bolt torque first. If the sealing face is damaged or the O-ring is flattened, this cover is the fix. Send truck model, axle model, and symptoms. We will confirm DZ91259520212 as the correct right-side cover and respond with pricing, lead time, and sealing face inspection data.
Contact Tolizer today to secure your balance shaft cover supply.
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