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Helm pump

Posted: Thu Aug 24, 2023 8:53 pm
by Eugen
One day on my way home there was a large boat console on the side of the road. People were moving out and we're cutting up a big boat in to pieces. After asking them if I could take the console I came back with the trailer and got it. I had forgotten about the parts I got off the console but came across the steering wheel and this helm pump today while going through junk that needs to go.

Are you thinking what I'm thinking? :D

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Re: Helm pump

Posted: Thu Aug 24, 2023 9:02 pm
by Spike188
Fuel transfer pump?

Re: Helm pump

Posted: Thu Aug 24, 2023 9:11 pm
by Eugen
I suppose it would work but I'm thinking about something else that my 644 could use.

Hint: it rhymes with a frolic stirring :rofl:

Re: Helm pump

Posted: Thu Aug 24, 2023 9:33 pm
by Spike188
Now that your photos show up, power steering!

Re: Helm pump

Posted: Thu Aug 24, 2023 9:49 pm
by Eugen
Spike188 wrote: Thu Aug 24, 2023 9:33 pm Now that your photos show up, power steering!
Indeed! Except there is no extra pump, the little box behind the wheel is itself the pump. All I need is an appropriate cylinder.

Re: Helm pump

Posted: Fri Aug 25, 2023 7:02 am
by DavidBarkey
@Eugen I have had the same thought for use on Frankie . I theory it should work with the appropriate sized double ended body mount cylinder mounted on the front axle .
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Re: Helm pump

Posted: Fri Aug 25, 2023 7:59 am
by Spike188
Minneapolis Moline G900 tractors used a similar system. When the steering motor wore, the tractor would drift to one direction. Staying the course required constant but slow rotation of the steering wheel to maintain a straight line. I will pull a parts breakdown of that system to confirm how the pump tied into the system.

Re: Helm pump

Posted: Fri Aug 25, 2023 8:09 am
by Timj
Spike188 wrote: Fri Aug 25, 2023 7:59 am Minneapolis Moline G900 tractors used a similar system. When the steering motor wore, the tractor would drift to one direction. Staying the course required constant but slow rotation of the steering wheel to maintain a straight line. I will pull a parts breakdown of that system to confirm how the pump tied into the system.
My 555 back hoe has a cylinder on each front wheel but it steers like that. You don't notice it during normal operation but driving down the road you do. I guess the 4118 does it too.

Re: Helm pump

Posted: Fri Aug 25, 2023 9:05 am
by Eugen
I got your gears turning eh? :D

Before going more complicated, I'm wondering if something simple like this would work acceptably

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Re: Helm pump

Posted: Fri Aug 25, 2023 9:25 am
by JSinMO
Eugen wrote: Fri Aug 25, 2023 9:05 am I got your gears turning eh? :D

Before going more complicated, I'm wondering if something simple like this would work acceptably


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I’m hoping you can see it from this picture, my 648 has the cylinder set up like that. I can get better pictures if you need them.

Re: Helm pump

Posted: Fri Aug 25, 2023 10:15 am
by Eugen
Thank you @JSinMO , I looked it up in the 648 parts manual. This confirms that a hydraulic cylinder in that position is not a crazy idea after all.

Looking at my 644

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This spot where the actuation bar is looks like it would be good for the hydraulic cylinder.

Re: Helm pump

Posted: Fri Aug 25, 2023 2:36 pm
by Jancoe
Looks like a nice upgrade for it. I do wonder how to size the cylinder to it so you're not having to have alot of rotations lock to lock? Are you going to use the boat steering wheel? Lol looks like you can handle a 28" wheel. That would cut down on lock to lock rotations. Lol

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Re: Helm pump

Posted: Fri Aug 25, 2023 2:38 pm
by Jancoe
My 6018 ps cylinder is I believe the same as the 648. They are 1.25 rod I do recall. Would have to check stroke length but guessing around 6".

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Re: Helm pump

Posted: Fri Aug 25, 2023 5:00 pm
by DavidBarkey
2 thing I don't like about the parallel to the frame is 1 always push or pulling on the axle . Ever notice the axles only ever twist on the side with the steering link . 2 due the differential between the piston side and the rod side , steers faster to one side than the other .
Axle mounted solves both those issues , but like every thing in life there are potential down sides .

Re: Helm pump

Posted: Sun Aug 27, 2023 9:55 am
by Eugen
Jancoe wrote: Fri Aug 25, 2023 2:38 pm My 6018 ps cylinder is I believe the same as the 648. They are 1.25 rod I do recall. Would have to check stroke length but guessing around 6".

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I'm going to measure the current travel distance of the rod necessary for lock to lock turn.

@DavidBarkey I hear you, but it's harder for me to source a cylinder like that. :33:

Re: Helm pump

Posted: Tue Aug 29, 2023 1:27 pm
by Eugen
Jancoe wrote: Fri Aug 25, 2023 2:38 pm My 6018 ps cylinder is I believe the same as the 648. They are 1.25 rod I do recall. Would have to check stroke length but guessing around 6".

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I checked the travel of a point on that rod from having the wheels all the way to the left to all the way to the right. Seems to me between 3 and 4 inches. I'm thinking the cylinder used for attachment lift on Case tractors would be fine, and think I must have one around here to test.