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Old 15 June 2009, 18:00   #11
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Some interesting thoughts thanks.

being a front mounted ram it has a connection at either end, so is not exactly extending or retracting, but both.

Whilst being stored I drop the engine back down, so its happening then, not when lifted up.

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Old 15 June 2009, 18:08   #12
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Apparently in the southern hemisphere engines will rotate to Starboard.
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Old 15 June 2009, 18:36   #13
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Kind of like the direction water dissapears down the plug hole
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Old 16 June 2009, 01:37   #14
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In the American embassy in Australia the have a device to make the water flow the "right way" down the toilet. ( It's true I saw it on the simpsons.) A bit like Codders big tanks on industrial hydraulic units which are to combat leaks, and nothing at all to do with cooling and having enough oil in the system to fill large unbalenced rams.
hydraulic steering will creep due to the way it handles impact loads (as I understand it.),
As long as it is full of oil and you can't move the ram too much by pushing the engine side to side don't worry about it. Get a symetrical steering wheel and you will hardly notice.
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Old 16 June 2009, 17:34   #15
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I didn't say it was the only reason................
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Old 17 June 2009, 05:33   #16
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Quote:
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Most hydraulics leak to a certain extent - that's why industrial equipment has big hydraulic tanks - they only get worried when the leaks get silly and they are wasting too much oil.
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Old 17 June 2009, 07:01   #17
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hydraulic steering always creeps. one of the reasons its not suitable(or legal) for road vehicles. Don't worry about it until it gets like our old JCB, had to rotate the steering wheel wheel a 2 rpm to keep the wheels straight
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Old 17 June 2009, 13:59   #18
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hydraulic steering always creeps. one of the reasons its not suitable(or legal) for road vehicles.
So whats power assisted steering then ? .. as fitted to cars, trucks , buses etc.... When it comes to JCB's you cant beat driving an old 2WD version with really worn front pinions through the Clyde tunnel dual carriageway with a 9'6" lane width restriction .. just to go straight .. you had to give the steering wheel a 2/3rds turn one way, then the other, to correct the opposite wander. Any miscalculation on your part would have your front bucket take the side off somones motor like a tin opener
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Old 17 June 2009, 15:14   #19
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Pure hydraulic steering as used on Competition Rock Crawling 4x4s etc is not legal for road use.

I might have the wrong idear, but it's something to do with there being no direct mechanical connection.

As I understand it, Power (assisted) steering is just that, in that the fluid is used to assist the direct mechanical connection.

If that makes sense.

Nasher.
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Old 17 June 2009, 15:30   #20
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Pure hydraulic steering as used on Competition Rock Crawling 4x4s etc is not legal for road use.

I might have the wrong idear, but it's something to do with there being no direct mechanical connection.

As I understand it, Power (assisted) steering is just that, in that the fluid is used to assist the direct mechanical connection.

If that makes sense.

Nasher.
thats it exactly. if PAS fails then the steering gets a bit heavy.
if full power steering fails it can whizz onto full lock and the steering wheel can rotate with enough force to break fingers! the metering unit in the orbitrol steering valve can act as a motor
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