CAT 1425868 Crankshaft Rear Oil Seal For CAT 3406 Diesel Engine

• Brand: CAT
• Model No.: 3406
• OEM Part Number: 1425868
• Product Name: Crankshaft Rear Oil Seal / Rear Main Seal
• Material: Rubber sealing lip with metal outer shell
• Marking: SHAFT ROTATION direction arrow, INSTALL DRY instruction printed on surface
• Fit Engine: CAT3406 inline six-cylinder diesel engine
• Application: CAT heavy-duty trucks, generator sets, excavators, wheel loaders and industrial stationary power units

1. Original OEM specification 1425868, precise dimension fully matches CAT 3406 crankshaft rear flange and flywheel housing bore
2. High wear-resistant rubber lip structure, excellent resistance to high temperature, engine oil corrosion and long-time rotary friction, effectively stop crankshaft rear end oil leakage
3. Clear rotation direction marking and dry installation reminder, avoid reverse assembly and seal damage during installation
4. Complete overhaul supporting part, can be matched with 6I3066 cylinder head gasket, valve stem oil seals, injector sleeves and full set of 3406 sealing kits for bottom end engine rebuild

Part 1425868 rear crankshaft oil seal is installed inside the flywheel housing at the rear end of CAT 3406 engine crankshaft. It is responsible for sealing the gap between the rotating crankshaft and stationary engine block, preventing lubricating oil from leaking out of the crankcase, and blocking dust, dirt and external impurities from entering the engine interior.

This seal must be replaced when disassembling the flywheel, clutch, transmission or engine rear housing to eliminate slow oil seepage and extend engine service life.

We supply parts for Kubota, Cumm ins, CAT, Perkins, Yanmar, Isuzu, Komatsu, Mitsubishi, Hino, Nissan, Vol vo, Deutz, Doosan, Daewoo, John De ere, Scania, Hyundai, JCB etc.

Shipping: Sea freight, air freight and international express are all available. Goods will be arranged for shipment promptly after payment confirmation.

Tax Notice: All import duties and local destination taxes shall be borne by the buyer. Please verify local customs regulations in advance.

1. What does "INSTALL DRY" mean on the 1425868 seal?

   It requires dry installation without applying grease or engine oil on the sealing lip, otherwise the seal will lose preload and cause oil leakage after operation.

2. How to confirm the installation direction?

   Follow the "SHAFT ROTATION" arrow printed on the metal shell to align with crankshaft rotating direction, incorrect direction will lead to rapid lip wear and failure.

3. Common failure symptoms of old rear main seal

   Oil dripping from bell housing, oil stains on the ground under transmission, excessive engine oil consumption without external pipeline damage.