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Hynautic KS-03 Seal Kit for K2 and H100 Cylinders

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SKU:
KS-03
Condition:
New
DISCONTINUED
In Stock - Ships Same Day (Order by 5pm EST)

Description

Hynautic KS-03 - Seal Kit for K-2 and H-100 Cylinders

KS-03 is the genuine Hynautic cylinder seal kit for resealing K-2 and H-100 steering cylinders. Use this kit to refresh internal sealing surfaces to help address bypassing and leakage caused by worn seals. This part is discontinued, so availability may be limited.

Compatibility

  • Fits: Hynautic K-2 and H-100 cylinders
  • Does not fit: K-2(B) cylinders - use KS-12 instead
  • 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

  • Seal and O-ring set for one cylinder application (as applicable)
  • Rod wiper(s) and backup rings (as applicable)
  • Additional O-rings for glands/ports (as applicable)

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-03 K-2, H-100 This page - discontinued
KS-12 K-2(B) Use for K-2(B) cylinders
KS-01 K-11, K-12 Small inboard
KS-02 K-18, K-19, K-20 Ball bracket style
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

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 O-rings, backups, and wipers from KS-03. 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
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  • 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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