Description
Hynautic KS-15 - Seal Kit for K-5(B) Cylinders
KS-15 is a genuine Hynautic cylinder seal kit used to reseal K-5(B) inboard steering cylinders. Use this kit when servicing a cylinder with seepage at the rod gland, moisture intrusion, or suspected internal bypass due to worn seals - provided the rod and bore are in good condition.
Compatibility
- Fits: Hynautic K-5(B) steering cylinders
- How to confirm: Check the cylinder’s stamped model on the end cap or barrel. If unsure, contact Tech Support with photos.
- Qty needed: One (1) kit reseals one (1) cylinder
What’s Included
- Seal and O-ring set for one K-5(B) cylinder
- Rod wiper(s) and backup rings as applicable
- Retaining wire or clip as applicable
Note: Contents can vary slightly by cylinder revision. Reuse of hard parts is expected unless damaged.
Installation Tips
- Protect the rod: Do not clamp on or scratch the polished rod surface - even small nicks can cause immediate leaks.
- Keep it clean: Clean the exterior and gland area before disassembly to prevent debris from cutting new seals.
- Inspect before reseal: Rod pitting or bore scoring can prevent a lasting repair. If wear is present, rebuilding is recommended.
- Lubricate seals: Use a light film of compatible steering/hydraulic fluid during assembly - do not install seals dry.
- Bleed after service: Any air introduced must be fully bled to restore consistent steering feel.
Maintenance Guidelines
- Inspect the rod and gland area periodically for fluid film, salt buildup, and corrosion.
- Keep bilges as dry as practical and rinse salt deposits around the cylinder when accessible.
- If steering feel changes (drift, pull, or frequent correction), verify fluid level and bleed the system before condemning components.
FAQs
Will KS-15 fix internal bypass?
Sometimes. If bypass is caused by worn internal seals and the rod and bore are in good condition, resealing can restore performance. If the bore is scored or corrosion is present, a rebuild is typically the better long-term fix.
How do I confirm I have a K-5(B) cylinder?
Look for the cylinder model stamped on the barrel or end cap. If it is unreadable, send photos to our Tech Support Page.
Do I need one kit per cylinder?
Yes - one KS-15 kit is intended to reseal one cylinder.
Should I rebuild instead of reseal?
If the rod is pitted, the bore is scored, or the cylinder has chronic leakage, rebuilding is often the most reliable path.
Related Hynautic Cylinder Seal Kits
| Part No. | Fits Cylinder(s) | Notes |
|---|---|---|
| KS-15 | K-5(B) | This page |
| KS-19 | K-6 | Limited availability |
| KS-08 | K-7 | Legacy cylinder kit |
| KS-09 | K-8 (prior to 4-15-94) | Older K-8 variant |
| KS-13 | K-3 (prior to 4-15-94) | Older K-3 variant |
| KS-17 | K-3, K-4, PSK11-12 | Common K-3/K-4 kit |
| KS-11 | K-1 | Single-cylinder kit |
| KS-12 | K-2(B) | K-2 variant |
| KS-02 | K-18, K-19, K-20 | Ball bracket style |
| KS-06 | K-21 to K-29 (post 1983) | Later cylinders |
| KS-14 | K-51 | Large inboard cylinder kit |
Downloads and Resources
| Description | Link |
|---|---|
| Hynautic Steering System Manual - general reference | LINK [PDF] |
| Hydraulic Cylinder Installation and Reference Guide | LINK [PDF] |
| Hynautic Cylinder Rebuild Service | LINK [Service] |
Questions?
- Tech Support: Tech Support Page
- Check Stock: Stock Inquiry Page
- Request a Shipping Quote: Request Quote Page
- Learn More About Seatech: About Us Page
- No Sales Tax on purchases outside California
- Buy Now Pay Later with Affirm or PayPal
- FREE Ground Shipping to the Lower 48 States
- Seatech Marine Products, Inc. is an authorized dealer, service center and installer for Hynautic.
International, USVI, Puerto Rican, Hawaiian and Alaskan Customers: We ship worldwide and via USPS. If shipping looks high, contact us for a quote.
Warranty Information
1 Review
-
Perfect Fit
I was glad I could find the rebuild kit for my 30-year-old hydraulic steering cylinders. Simple installation!
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