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Hynautic KS-02 Seal Kit for K18-K19 Cylinders

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SKU:
KS-02
Condition:
New
DISCONTINUED
In Stock - Ships Same Day (Order by 5pm EST)

Description

Hynautic KS-02 - Seal Kit for K-18, K-19 and K-20 Cylinders

KS-02 is the genuine Hynautic cylinder seal kit used to reseal K-18, K-19, and K-20 inboard steering cylinders. This kit is commonly used to restore gland and piston sealing to help stop internal/external leakage and regain steering precision. Always verify the exact cylinder model and revision before ordering.

Compatibility

  • Fits: Hynautic K-18, K-19, K-20 cylinders
  • Does not fit: K-11, K-12, K-21 to K-29, K-31, K-51, etc. See related kits below.
  • How to confirm: Check the cylinder’s stamped model on the end cap or barrel. If unsure, contact Tech Support with photos.

What’s Included

  • Piston seal set and backup rings (typical)
  • Rod seal and wiper (typical)
  • O-rings for glands and ports (typical)

Note: Contents can vary slightly by cylinder revision. Reuse of hard parts is expected unless damaged.

Related Hynautic Cylinder Seal Kits

Part No. Fits Cylinder(s) Notes
KS-02 K-18, K-19, K-20 This page
KS-01 K-11, K-12 Small inboard
KS-05 K-31 Fixed mount cylinder
KS-04 K-21 to K-29 (pre-1983) Early cylinders
KS-06 K-21 to K-29 (post 1983) Later cylinders
KS-13 K-3 (prior to 4-15-94) Older K-3
KS-14 K-51 Large inboard
KS-19 K-6 Limited availability
KS-11 K-1 Single-cylinder kit
KS-12 K-2(B) K-2 variants

Install Overview - Resealing a Hynautic Cylinder

This is a high-level overview to help you plan the job. Follow the Hynautic service manual for exact steps and specs.

  1. Prep - Clean the exterior, secure steering, and mark current hardware locations. Protect the rod from scratches.
  2. Disassemble - Depressurize the system. Remove retaining wire(s) and end cap per the manual. Withdraw rod and piston assembly.
  3. Inspect - Check the rod surface for nicks and the bore for scoring. Replace damaged hard parts before reseal.
  4. Reseal - Replace piston seals, rod seals, backups, and O-rings from KS-02. Lightly lubricate seals with compatible hydraulic fluid.
  5. Reassemble - Install rod assembly, seat end cap, and re-fit retaining wire(s). Verify smooth travel by hand.
  6. Bleed and test - Refill, bleed air, and verify full stroke without binding or leaks. Sea trial under safe conditions.

Tip: If the rod is pitted or the bore is scored, a reseal may not hold. Consider our Hynautic cylinder rebuild service.

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?

  • 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.

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Warranty Information

Seatech Marine Products is an authorized dealer for Dometic that distributes SeaStar Products, this part has a 2 Year Limited Warranty from them. Please visit their website for full details: https://www.dometic.com/en-us/outdoor/support/warranty-statements
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1 Review

  • 5
    Exactly what was needed

    Posted by Karl Kobilke on 24th Jul 2023

    Exceptional service, goy shipment out the same day. The only screwup was UPS who took 3 days to deliver a priority shipment.

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