6711‑21‑3521 Crankshaft Front Oil Seal Diesel Engine Spare Parts

Keywords: 6711‑21‑3521, Crankshaft Front Oil Seal, Engine Crank Seal, Komatsu 6D125 6D140 Engine Parts, Excavator Diesel Engine Spare Parts, Construction Machinery Sealing Accessories

Product Overview

Crankshaft front oil seal 6711‑21‑3521 is a critical sealing component for Komatsu 6D125 & 6D140 diesel engines. It is installed at the front end of the crankshaft to block engine‑oil leakage from the crankshaft‑housing gap, while preventing external dust, dirt and moisture from getting inside the engine crankcase. Replacing an aged, hardened or leaking front crankshaft oil seal can effectively solve oil seepage at crankshaft pulley side, avoid engine‑oil loss and insufficient lubrication risk. This aftermarket replacement seal is perfect for routine maintenance, leak‑repair work and full engine overhaul for Komatsu excavators and heavy‑duty construction machines.

Detailed Specifications

Key Features & Advantages

• Exact OEM‑Matching Installation Precision‑produced dimensions, perfectly fits original crankshaft and timing‑cover housing, direct installation without modification.
• Premium High‑Performance Rubber Material Excellent oil‑resistance, high‑temperature‑resistance and anti‑aging property. Long service‑life even under harsh, continuous high‑load working environment.
• Stable & Tight Lip‑Sealing Performance The sealing lip keeps consistent pressure against crankshaft surface, effectively stops slow oil seepage and heavy leakage.
• Strict Multi‑Step Factory Quality Inspection Every crankshaft oil seal undergoes dimension checking, surface defect inspection and sealing‑performance test before delivery, 100% tested.
• Cost‑Effective Engine‑Leakage Maintenance Solution Timely replacement prevents secondary damages such as belt slipping, oil contamination, insufficient lubrication and expensive engine repair.

Application Scope

Compatible Equipment List: ‑ Komatsu 6D125 / 6D140 Diesel Engine ‑ Komatsu Excavators, heavy‑duty machinery, generators and construction‑machinery equipment requiring spare‑part No.6711‑21‑3521

Our Company Advantage

We are a professional supplier of comprehensive excavator and heavy‑duty machinery spare‑parts. We provide oil seals, gasket kits, piston ring kits, thermostats, oil cooler assemblies, cylinder‑head spare‑parts, fuel injectors, water pumps, sensors, solenoid valves, hydraulic spare‑parts and engine overhaul kits for Komatsu, cumm-ins, SDEC, Cater-pillar, Kobelco, Hyundai, Hitachi, Doosan, Sany, Isuzu and other well‑known machinery brands. ‑ Large ready‑to‑ship inventory for engine sealing spare‑parts ‑ Factory‑direct competitive wholesale price ‑ Mixed‑order & one‑stop spare‑parts procurement supported ‑ Professional part‑number matching technical support service

Packaging & Shipping ‑

• Inner sealed plastic bag + foam shock‑absorbing protection, prevent dust, moisture and scratches ‑
• Outer reinforced export carton to avoid damage during long‑distance sea & land transport ‑
• Multiple shipping options: sea freight, air freight, international express for small trial orders ‑
• Export documents including Commercial Invoice, Packing List are available

Contact Us

If you need more Komatsu 6D125 / 6D140 series engine sealing spare‑parts, overhaul accessories or other heavy machinery replacement spare‑parts, please send your parts list over to us. We will offer you our best quotation promptly.