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bunggas
Joined: 08 Aug 2012
Posts: 3
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 Posted: Tue Aug 14, 2012 7:41 pm Post subject: Hydraulic steering |
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Hi Guys
Just a quick one. I have recently purchased a fairly new boat and have some questions about turning the wheel on my tub. The motor is a 250hp Yamaha offshore series.
I prefer the quick turning speeds while approaching and mouring the boat to various jettys, as im finding it very difficult at the moment.
Firstly;
-Is it usual for a motor of this size to be heavy at the wheel?
- Are there any ways which I could make it turn easier, perhaps a bigger wheel or greasing etc maybe?
-What signs could you look for if your hydraulics are faulty?
- Lastly is there any recommendations to products you've experienced which work well to these larger motors?
Cheers. |
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JayyyyGee
Joined: 04 Feb 2012
Posts: 2159
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| Posted: Tue Aug 14, 2012 8:26 pm Post subject: |
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| Quote: |
| Is it usual for a motor of this size to be heavy at the wheel? |
Not really but depends on what you call slow turning
| Quote: |
| Are there any ways which I could make it turn easier, perhaps a bigger wheel or greasing etc maybe? |
Bigger wheel wont make any difference exept to give you leverage
Cant grease hydraulic system itself & depending on hyd system you have
If fixed cyliner just undo link arm thingy turn motor by hand to see how free it turns manually if stiff yolk thingy would be prob either dry grease or rust
Then with motor free go turn steering wheel if still not free enogh for your liking may have to think new system
| Quote: |
| What signs could you look for if your hydraulics are faulty? |
Notchy wheel indicates low oil
highly unlikely but depending how long oil has been in system it may have lost viscosity or if wrong oil was used it definately would make turning steering hard
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bunggas
Joined: 08 Aug 2012
Posts: 3
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| Posted: Tue Aug 14, 2012 10:07 pm Post subject: |
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Hi Hayy
The steering wheel seems quite stiff and it takes a bit of effort to turn the wheel. The Hydraulic system is one year old approximately, hmm.
Maybe switching from a 150yam to a 250yam has its ups and downs in weight ratios. |
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JayyyyGee
Joined: 04 Feb 2012
Posts: 2159
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| Posted: Tue Aug 14, 2012 10:39 pm Post subject: |
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| Quote: |
| Maybe switching from a 150yam to a 250yam has its ups and downs in weight ratios |
Gather that you're saying hydraulic steer was on the boat initially with a 150 hp it worked fine
You repowered to a 250 hp & it went stiff 
Do as i suggested previous post isolate steering from motor if steering feels free as & motor is stiff trying to turn it manunually then very very good guess prob is in the yolk thingy
Extra weight of bigger motor is a non issue if anything the extra weight would assist motor free spining
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Noelm1
Joined: 24 Jul 2006
Posts: 2575
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| Posted: Wed Aug 15, 2012 8:08 am Post subject: |
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| Probably the best option for you will be a knob on the wheel to make it easier to spin faster, the new motor should make little difference to the steering effort. |
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sharky!
Joined: 06 Nov 2010
Posts: 162
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| Posted: Wed Aug 15, 2012 8:50 am Post subject: |
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| Ditto for fitting a knob on the wheel. Handy everywhere but especially when manoevering |
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JayyyyGee
Joined: 04 Feb 2012
Posts: 2159
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| Posted: Wed Aug 15, 2012 6:25 pm Post subject: |
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Offering yourself shucky 
If turning the wheel is as tight as mentioned what makes you think a nob would help
Could you be refering to a 2 handed nob by any chance
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Hydro_boy
Joined: 10 Jan 2012
Posts: 474
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| Posted: Wed Aug 15, 2012 6:33 pm Post subject: |
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| deadhead the steering cylinder and see what happens. 1st things 1st you need to check the hydraulics before you go any further. You should feel/hear the little relief valve pop open at the helm. If the wheel keeps turning (with force and without the pop sound) then you have bypass somewhere. |
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Hydro_boy
Joined: 10 Jan 2012
Posts: 474
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| Posted: Wed Aug 15, 2012 6:55 pm Post subject: Re: |
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[quote="JayyyyGee"]
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highly unlikely but depending how long oil has been in system it may have lost viscosity or if wrong oil was used it definately would make turning steering hard |
FYI: Impossible for oil to decrease viscosity over time....only thing that will affect viscosity is mixing with another oil with a different viscosity. In other words, if you mix 50 litres of ISO 32 with 50 litres of ISO 68 you will get 100 litres of ISO 46. Excluding water ingress, viscosity will not alter over time. |
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Hydro_boy
Joined: 10 Jan 2012
Posts: 474
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| Posted: Wed Aug 15, 2012 7:01 pm Post subject: Re: |
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| bunggas wrote: |
Hi Hayy
The steering wheel seems quite stiff and it takes a bit of effort to turn the wheel. The Hydraulic system is one year old approximately, hmm.
Maybe switching from a 150yam to a 250yam has its ups and downs in weight ratios. |
This will possibly make the steering heavier but will not affect your lock to lock ratio unless the relief is popping open. The displacement of the helm orbitrol is constant so the speed will not be affected (excluding relief bypass). Test the hydraulics 1st as its real guess work without eliminating this. |
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