CAT 8L9663 SEAL for 3306 Caterpillar Part - WSTPARTS

WSTPARTS supplies the 8L9663 SEAL, a CAT Drivetrain replacement part designed for Caterpillar 3306 and 3406E applications. It is categorized under Drivetrain. Every unit is fitment-verified before dispatch. Manual reference: 3306: ELECTRICAL AND STARTING SYSTEM, group 187-2034, page 952; 3406E: ELECTRICAL AND STARTING SYSTEM, group 118-9476, page 343.

8L9663 SEAL for Caterpillar 3306 — Genuine CAT & Replacement Part

WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement SEAL (Part # 8L9663). Designed for CAT 3306, 3406E equipment.

Compatible Models

Key Features

• ✔ 100% compatible with CAT 3306, 3406E
• ✔ Meets Caterpillar original quality and performance standards
• ✔ Genuine CAT lines: New Genuine / Cat Reman / Cat Classic | OEM-equivalent direct replacements
• ✔ Available for order, contact for lead time

Specifications

Part Number (MPN)	8L9663
Product Name	SEAL
Brand	CAT
Applicable Models	3306, 3406E
Weight	0.05 kg
Condition	New (Genuine CAT / OEM-equivalent direct replacement)
Warranty	12 Months

Where This Part Fits

Every row below is a real listing of 8L9663 in the Caterpillar parts manual: the machine it is published under, the system it belongs to, the group number and the manual page. Use it to confirm the part against your own parts book before ordering.

Machine	System	Group No.	Manual Page
3306	ELECTRICAL AND STARTING SYSTEM	187-2034	p.952
3406E	ELECTRICAL AND STARTING SYSTEM	118-9476	p.343
3306	ELECTRICAL AND STARTING SYSTEM	187-2034	p.954
3406E	ELECTRICAL AND STARTING SYSTEM	118-9476	p.345

System Notes — ELECTRICAL AND STARTING SYSTEM

The electrical and starting system covers the battery, starter motor, alternator, wiring harness, relays, switches and the instrument panel. It carries current from the batteries to the starter to crank the engine, and from the alternator back to keep the batteries charged. Because these machines work in dust, vibration and wide temperature swings, connectors corrode, harness insulation chafes against the frame, and starter solenoids burn out from repeated short cranks. Parts in this group are usually replaced on a symptom basis — slow cranking, a dash warning, lights that dim under load, or a no-start condition traced to an open circuit.

FAQ

Is 8L9663 the right part for my machine?
Match the part number on your old part, or send us your equipment serial number — WSTPARTS verifies fitment free of charge for CAT 3306.

Genuine CAT vs direct replacement — what is the difference?
Genuine CAT covers three factory lines: New Genuine, Cat Reman (core exchange with core charge) and Cat Classic (brand-new economy line). OEM-equivalent direct replacements are non-CAT parts; grade and warranty are confirmed in the quotation.

Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a warranty per quotation.

📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com