Hynautic HP6039 Ball Joint for Hynautic Cylinders K-22, K-27, K-28, K-29

Hynautic HP6039 (670030) Ball Joint Rod End - For K-22, K-27, K-28, K-29 Cylinders

The Hynautic HP6039 ball joint (also referenced as Hynautic 670030) is the rod end ball joint used on select Hynautic fixed-mount balanced steering cylinders. Over time, the ball joint can wear, loosen, or crack - replacing it restores proper articulation and helps prevent binding through the steering arc.

Features

• Replacement ball joint rod end for Hynautic steering cylinder applications
• Helps maintain smooth articulation and alignment through full steering travel
• Recommended replacement if you notice play, noise, binding, or visible cracking at the rod end
• Can be used to add a second ball joint to a K-22 configuration (to match a two ball joint setup)

Specifications

Compatibility

Related Products

• Hynautic K-22 Cylinder: K-22 Fixed-Mount 1.5" x 10" Cylinder
• Seal Kit (Pre-1983): KS-04 Seal Kit (K-21 thru K-29)
• Seal Kit (Post-1983): KS-06 Seal Kit (K-21 thru K-29)
• Hydraulic Steering Fluid: HA5430H Hydraulic Steering Fluid - 1 Quart
• Cover Boot (if applicable): HP6006 Cover Boot (K-22, K-27, K-31, K-33)

Installation Tips

• Secure the rudder/tiller arm so it cannot swing when the rod end is disconnected.
• Before removing the old ball joint, inspect the mounting bolt/pin and spacers for wear - replace any worn hardware.
• After installation, cycle steering lock-to-lock and confirm there is no binding and full articulation at both ends of travel.
• If you are unsure this is the correct rod end, send Tech Support a photo of your cylinder end and the existing ball joint.

Maintenance Guidelines

• Inspect the ball joint each season for looseness, corrosion, cracking, or elongated mounting holes.
• Address any play immediately - excess movement can accelerate wear in the steering linkage.
• Keep the rod end area clean and free of buildup that can restrict movement.

FAQs

How do I know if my ball joint needs replacement?
If you see visible cracking, feel looseness/play at the rod end, hear clunking, or experience binding through the steering arc, replacement is recommended.

How many do I need?
Many cylinders use one ball joint, while some configurations use two. If you are unsure, send a photo of your cylinder and rod ends to Tech Support and we will help confirm quantity.

Can I add a second ball joint to my K-22?
Yes - HP6039 can be used as an add-on for K-22 cylinders so both ends have ball joints (matching a two ball joint setup).

Downloads and Resources

• Hynautic Cylinder Specs (K-22 / K-27 / K-28 / K-29) - PDF
• Hynautic Steering Bleeding Instructions - PDF
• Hynautic Cylinder Rebuild Service - Bronze (Send us your cylinder)

Questions?

• Tech Support: Tech Support Page
• Check Stock: Stock Inquiry Page
• Shipping Quote: Request Quote Page

Seatech Marine Products, Inc. is an authorized dealer, service center and installer for Hynautic.