Gear Case Seal Kit – Fits Suzuki DT25/DT30/DF25/DF30 (Replaces 25700-95D03, 25700-95D00)

Gear Case Seal Kit – Fits Suzuki DT25/DT30/DF25/DF30

This gear case seal kit is designed for Suzuki 2-Stroke DT25C/DT30C and 4-Stroke DF25/DF30 (non-V-twin) outboard motors, covering models from the 1990s through the 2000s. It provides the necessary components to service and reseal the lower unit gearcase.

This kit is a direct replacement for Suzuki OEM part numbers 25700-95D00, 25700-95D01, 25700-95D02, and 25700-95D03, as well as Sierra part numbers 18-8341 and 18-7573.

• Includes all seals, O-rings, and gaskets required for a complete gearcase housing service.
• Compatible with standard marine gasoline engines.
• Important: Not intended for use with Suzuki DF25 V-Twin or DF25A/30A series engines.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Suzuki owners, you can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• Includes all necessary seals, O-rings, and gaskets required for a complete gearcase service.

Installation Guide

Professional installation is highly recommended. The following are general steps and may not be exact for your model.

1. Drain the gearcase oil completely by removing the drain and vent plugs.
2. Remove the propeller assembly.
3. Unbolt and carefully separate the lower unit (gearcase) from the engine's upper casing.
4. Disassemble the gearcase to access the propeller shaft, driveshaft, and shift shaft seals.
5. Carefully remove all old seals and O-rings, taking note of their orientation.
6. Clean all sealing surfaces thoroughly to remove any old sealant or corrosion.
7. Install the new seals and O-rings from the kit, ensuring they are properly seated.
8. Reassemble the gearcase components according to manufacturer specifications.
9. Reinstall the lower unit onto the engine, ensuring proper driveshaft and shift rod alignment.
10. Refill the gearcase with the correct type and amount of fresh marine gear oil.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Suzuki engine?
A: Please check your engine model against the "Compatible Engine Models" table. It is crucial to note that this kit does not fit DF25 V-Twin or the newer DF25A/DF30A models. Verify your OEM part number if possible.

Q: What are the common signs that my gear case seals need replacing?
A: The most common signs of a failing gear case seal are discovering a milky, white substance in your gear oil (indicating water intrusion) or seeing gear oil leaking from the propeller shaft or lower unit housing.

Q: How difficult is this kit to install?
A: We strongly recommend professional installation. Replacing gearcase seals requires disassembly of the lower unit, specialized tools like a seal puller and press, and a good understanding of outboard mechanics to ensure everything is reassembled and aligned correctly.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.