English  |
6162-64-3940
Komatsu
6162-64-3940
Hello, Equipment Owners and Maintenance Chiefs! I am the supplier who specializes in solving problems like "crankshaft oil leaks," "hydraulic shaft seepage," "bearing contamination," and "oil seal flinging." Today, I’m recommending a "small rubber ring with a steel casing that looks simple but acts as the 'steel sentinel' guarding the lifeline of your rotating shafts"—the Cased Oil Seal for Construction Machinery.
Anyone in mining or infrastructure knows that inside the heart of an excavator or drill rig, the crankshaft spins at high RPM while hydraulic piston rods cycle rapidly. These moving parts rely entirely on lubrication to survive. If the oil seal fails, the trouble escalates quickly: minor leaks waste oil, create hazards, and risk bearing failure from oil starvation; major failures allow dust and water to invade, scoring the shaft and destroying bearings—potentially wrecking an engine or hydraulic pump worth tens of thousands. Many cheap seals on the market look similar but use ordinary rubber and painted sheet metal for the case. Under engine heat and oil immersion, the rubber swells, hardens, or cracks within days; the case rusts, gouging a trench in the shaft. Our Cased Oil Seal is specifically engineered for excavator crankshafts, hydraulic pump shafts, and rotating shafts in mining equipment. It doesn’t just seal; it withstands high heat, resists pressure, preserves the shaft, and never rusts through. Choose us to install a "protective bell" over your rotating shafts—ensuring not a drop of lubricant escapes and not a grain of dirt enters, securing your equipment’s longevity.
Oil-Resistant Rubber Lip: Flexible & Enduring:
The soul of an oil seal is its lip; material dictates everything.
Material: The sealing lip is crafted from premium oil-resistant rubber. This isn’t ordinary consumer-grade rubber but a specialized compound engineered for constant contact with mineral oils and hydraulic fluids. It is highly "immune" to lubricants, resisting swelling, shrinkage, or deformation during long-term immersion.
Performance: Offers exceptional temperature resistance. Even under the intense heat of an engine crankcase (up to 120°C or higher), it remains soft and elastic, maintaining a tight grip on the shaft. During cold winter startups, it stays pliable without hardening or cracking, ensuring immediate sealing. Special wear-resistant additives in the compound allow it to withstand minor shaft runout while resisting abrasion, extending service life.
Carbon Steel Case: Rigid Support:
The backbone of an oil seal is its case; rigidity ensures installation stability.
Material: The internal metal case is constructed from high-quality carbon steel, providing all necessary structural strength to prevent deformation or distortion under pressure.
Process: The case is precision-stamped for exact dimensions and superior roundness. Its surface undergoes galvanization (zinc plating). This zinc layer acts like a "rust-proof armor" for the case. Even in humid mining environments or oily mixtures with trace moisture, it will never rust or corrode. This prevents rubber cracking caused by case expansion due to rust and eliminates the risk of contaminating lubricants with rust particles.
Integrally Molded: Unbreakable Bond:
The bond strength between rubber and metal determines if the seal "loses its skirt" (separates).
Process: Manufactured via an integrally molded composite process. Using specialized chemical treatments and vulcanization, the rubber bonds at a molecular level with the metal case. Regardless of equipment vibration or extreme temperature cycling, the rubber and case remain inseparable and secure. This ensures the seal maintains correct alignment and constant radial sealing force during operation.
Dual-Lip Protection: Stable Sealing:
An oil seal must retain lubricant while blocking contaminants.
Design: The primary sealing lip is precision-engineered, often featuring a garter spring (implied by function) and micro-lip geometry. The inclusion of hydrodynamic spiral ribs (helix) on the lip surface actively "pumps" any creeping lubricant back into the cavity. Simultaneously, the outer lip (or main lip) forms a robust barrier against external dust, mud, and abrasive particles.
Effect: In dusty, muddy mining environments, it creates an impenetrable dynamic seal. It ensures the crankcase or hydraulic system remains clean, lubricant stays contained, and external contaminants are excluded—dramatically extending the life of bearings and shafts.
Parameter | Specification |
|---|---|
Product Name | Cased Oil Seal / Rotary Shaft Seal / Crankshaft Rear Seal |
Sealing Material | Premium Oil-Resistant Rubber |
Case Material | High-Quality Carbon Steel |
Manufacturing Process | Stamping + Integral Composite Vulcanization |
Surface Treatment | Galvanized (Zinc Plated) Case |
Key Properties | Oil Resistance, High-Temp Resistance, Abrasion Resistance, Anti-Aging, Bi-Directional Sealing |
Compatible Locations | Engine Crankshafts, Hydraulic Pump/Motor Shafts, Hub Axles |
Engine Crankshaft Sealing: Preventing crankcase oil leaks while blocking clutch dust or road grime, protecting the engine core.
Hydraulic Pump/Motor Shaft Sealing: Preventing high-pressure hydraulic oil leakage to maintain system pressure and avoid environmental contamination.
Hub Bearing Sealing: Retaining grease and excluding mud/water in harsh off-road mining conditions to protect wheel bearings.
Equipment Overhaul: Replacing aged, hardened, worn, or rusted seals to eliminate chronic "leak" issues.
Extensive Range: Regardless of your excavator size or hydraulic pump model, we have the corresponding ready-made cased oil seal. Just provide the shaft diameter (ID), bore diameter (OD), and width—or your equipment model—and we ship immediately.
Reliable, Leak-Free: We guarantee our seals use genuine oil-resistant rubber with rust-proof cases. After installation, the seal is tight with zero seepage. If leaks develop or the case rusts within days, we replace it.
Value for Money: We don't sell the cheapest recycled rubber seals, which look black but fail quickly under oil exposure—leading to repair bills costing thousands. We sell the most durable. Do the math: one quality seal protects core components worth tens of thousands—an unbeatable investment.
A Quick Tip for the Mechanics:
Brothers, installing this seal requires precision and cleanliness.
Clean Thoroughly. Before installation, meticulously clean the shaft and bore. Remove all old seal residue, rust, and burrs from the shaft using fine abrasive paper or a honing stone. Any imperfection can become a leak path.
Inspect the Shaft. Check the shaft for wear grooves. If significant ridges exist, replacing the seal alone won't solve the problem; the shaft may require repair (e.g., sleeving or welding).
Lubricate & Protect.
Lubricate: Apply a light coat of clean oil or grease to the seal lip and shaft. This prevents burn-up during initial startup.
Shroud: If the shaft has keyways, threads, or steps, always use a tapered installation sleeve (or wrap the area with tape) to prevent the seal lip from catching, tearing, or flipping during passage.
Install Correctly.
Orientation: The marked side of the seal (usually the side with the spring or printing) must face the lubricant (i.e., inward toward the oil).
Drive-In: Use a proper seal driver tool (or a flat, round socket matching the case OD). Tap or press the seal in straight and evenly. Never hammer the rubber lip directly or strike the case at an angle—this causes distortion or misalignment.
Depth: Ensure the seal seats fully to the specified depth, flush with the bore face or per design specs.
Test & Inspect. After installation, refill lubricant and start the equipment. Monitor the seal area for several minutes to confirm zero leakage before returning the machine to service. Work safely and go home in one piece!
