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Ford 6600 power steering replacement

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04-28-2018 02:52:45

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The power steering box on our Ford 6600 has failed. Pulling it apart, it is a god awful design with all the thrust from the steering ram being put on a small manufactured ball bearing where the inner race is part of the recirculating ball worm/metering unit shaft, thus if it fails the worm end play moves up to the point the metering unit no longer works and it wrecks the inner race that is part of the shaft. Ours also has a badly scored bore for the steering ram.

I have been told the worm shaft is not available, a whole replacement aftermarket steering box is two and a half thousand and not rated for tractors with a loader fitted. (My location is AU not US)

So was thinking of fitting an orbital steering valve and hydraulic ram. Has anyone done anything like this before?

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04-30-2018 02:50:05

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 Re: Ford 6600 power steering replacement in reply to OzRinger, 04-28-2018 02:52:45  
Thanks. Have looked at the 6610 type and looks like up to 1985 they used the same power steering system as the 6600.

From 1985 they moved to an 120cc orbital metering unit and a steering ram around the front axle area. I have been doing some calculations and the original power steering unit has a stroke of 3.5 inches and a bore of 3.5 inches, with 6 turns lock to lock.. Which at 1100psi pump pressure is about 10500 lbs of force. At the external steering arm this is reduced to around 3000lbs of force.

Thinking of something like a Char Lynn steering unit of 6 or 7 cu in capacity and a 2.5" bore ram to replace the link from the power steering unit to the pitman arm inside that big casting in the front.

There is a unit made in Oregon that does this. https://www.farmlandtractor.com/Power-Steering-Conv-Kit-p/fd6600psk.htm

I can not put too much force on the steering as I know that front casting is weak as we have already broken the steering pivot there once. Would prefer to keep it similar to original. I have substantial metal fabrication tools available so doing the work is possible, just needs to be engineered correctly.

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04-29-2018 06:06:18

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 Re: Ford 6600 power steering replacement in reply to OzRinger, 04-28-2018 02:52:45  
I had a 4600 fail on me and it too was a mess inside. Bought a new gearbox from the Ford-NH dealer for $2k.......ouch.

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04-28-2018 07:22:32

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 Re: Ford 6600 power steering replacement in reply to OzRinger, 04-28-2018 02:52:45  
The only time that bearing should see maximum thrust is when the system is run out of oil and emergency steering is needed. That box was never designed to be steered "manually".

There are still a lot of those boxes in use today, nearly 50 years after it was designed, working just fine.

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David G

04-28-2018 06:23:44

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 Re: Ford 6600 power steering replacement in reply to OzRinger, 04-28-2018 02:52:45  
I would think you could convert it to the hydrostatic steering that is on the 6610 and newer.

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