Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

[Blake0912]

Hi guys I have a 1987 21ft Pursuit with a 1987 225 Johnson and the hydraulic steering went out all of a sudden I have not done anything to the steering since Ive had the boat it has never been a problem it was very tight and responsive then the last trip out , it just lost pressure completely it takes about 20 turns of the wheel to get the motor to start turning , there has never been any fluid leaking in the bilge/or anywhere else on the boat.

I do not have any experience with bleeding or doing maintenance to a hydraulic system, I noticed most of the post I run across online are "newer" seastar style set ups that have a fill hole on the helm, mine does not the reservoir is mounted on the transom. If anybody can help identify the brand/type mine is that would be great. And also point me in the right direction for finding instructions of how to bleed the system/add fluid.

Pics Included
Thank you!

 

[smokeonthewater]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

that is the same setup except I/O I had on my carver.... put 15 psi in that accumulator and try again.... I think you'll find that it starts working... You probably have a small leak at the helm shaft seal and it has drawn in some air... Mine used to drip 2 or 3 drops of oil on the floor of my flybridge in a week. I had planned on changing the seal but never got around to it.

 

[Blake0912]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

Where do I add the fluid, the nipple on the top of the drum is the type you find on a tire. Is there some sort of special connector I need to buy?

 

[smokeonthewater]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

unscrew the big aluminum hex fitting under the air nipple to fill. there are sight glasses for fill level on front .... use a tire chuck to pressurize with air afterward

 

[Blake0912]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

Okay I'll try it out this weekend , thanks for the tips. After I add fluid a pressurize it do I need to bleed the system or should it function properly ?

 

[Don S]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

You have a Hynauric steering system. The "Fluid" is a 50/50 antifreeze/water mixture. So be careful what you do.
Here is some info that might help.
Hynautic Steering and all hydraulic steering needs

 

[Blake0912]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

Thanks that's a great website I'm glad I did not dump oil into it.

 

[Blake0912]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

I was just thinking , and I remeber seeing red fluid come out of the rod by the motor. Maybe the previous owner used transmission fluid instead of the 50/50 water/antifreeze mix. Could this of damaged my system ?

 

[pole position]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

You have a Hynauric steering system. The "Fluid" is a 50/50 antifreeze/water mixture. So be careful what you do.
Here is some info that might help.
Hynautic Steering and all hydraulic steering needs

??? I don't think so.Use hydraulic oil.

 

[Blake0912]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

According to the Hynautic instructions it says to use Hynautic Steering Fluid MCO-06. And I believe Dextron 3 Automatic Transmission Fluid will be comparable ?

 

[Don S]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

For sure go by the instructions. I may be remembering it wrong. It may have been the throttle and shift actuators that used the AF and not the steering. Same type reservoir. Been a lot of years since I have even worked on one.

 

[smokeonthewater]

Re: Help Identifying Type Of Hydraulic Steering On My 1987 Pursuit 2100

yep mine had atf in it

When I got the boat the system was open with a cut hose... I replaced the hose and filled with atf. It didn't work worth a darn... I pressurized it and it started working fairly well.... I steered full lock left to right a couple dozen times as fast as I could and it got to working great... I never did the purge procedure because it worked great.