6150-21-3230 Crankshaft Rear Oil Seal For Komatsu 3D84-3 Engine PC30-7 Excavator

• OEM Part Number: 6150-21-3230
• Engine Model: Komatsu 3D84-3
• Product Name: Crankshaft Rear Oil Seal / Flywheel End Rear Main Shaft Oil Seal
• Applicable Equipment: Komatsu PC30-7 Mini Excavator, small compact loaders and generators with 3D84-3 three-cylinder diesel engine
• Seal Type: Double Lip Metal Skeleton Rotary Shaft Oil Seal
• Material: High temperature aging resistant NBR nitrile rubber with embedded rigid metal frame, internal spiral oil return thread
• Core Function: Seals the gap between crankshaft rear journal and engine block, prevents engine oil from dripping into flywheel and clutch housing, avoids clutch slipping, friction plate contamination and transmission premature failure

1. Standard OEM part 6150-21-3230, fully dimensional matched for Komatsu 3D84-3 engine, direct press installation without trimming or modification.
2. Built-in metal skeleton effectively resists deformation caused by engine high temperature and long-term vibration, keeps stable sealing performance under severe working conditions.
3. Inner reverse spiral thread generates centrifugal oil backflow effect during crankshaft rotation, greatly improves high-speed anti-leakage ability.
4. Strong resistance to engine oil corrosion, abrasion and thermal degradation, longer service life than ordinary aftermarket oil seals.

This rear crankshaft oil seal with official OEM number 6150-21-3230 is a critical sealing component for Komatsu 3D84-3 diesel engine. It is mounted on the flywheel side of the crankshaft, belonging to the complete 3D84-3 engine overhaul gasket kit. When the oil seal rubber hardens, cracks or wears out, engine oil will continuously leak from the engine rear end, pollute the flywheel assembly and cause clutch power transmission failure. It must be replaced together with full gasket set during engine major overhaul, cylinder head repair or clutch disassembly service. Every oil seal is strictly inspected for size tolerance, rubber hardness and sealing tightness before delivery.

We supply parts for Kubota, Cumm ins, CAT, Perkins, Yanmar, Isuzu, Komatsu, Mitsubishi, Hino, Nissan, Vo lvo, Deutz, Doosan, Daewoo, John Dee re, Scania, Hyundai, JCB etc.

A: Visible oil dripping at the bottom of flywheel bell housing, oil stains on clutch cover, abnormal engine oil consumption without other pipeline leakage faults.

A: Grind and polish crankshaft rear journal to remove burrs and scratches; use special sleeve tool to press the oil seal vertically and evenly to prevent tilting and sealing lip tearing; coat thin clean engine oil on the inner lip before pressing in place.