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Clooney
:

P/S Out of Control Update

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Blksmok

12-29-2002 10:08:52




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Clooney...I pulled the entire p/s assembly off of the pedastal and found that the worm gear would turn when the external steering shaft coupling was turned. However, when a load was applied to the worm gear the coupling would continue to turn while the worm gear did not. So,the coupling was spinning on the worm gear shaft. The steering gear looked good. I had an extra p/s assembly on the shelf so I just put that one on and I'm back in business with the "demon 70D". I'll pull the p/s assembly apart to check it out tonight. Not sure how it comes apart. I will need to read my JD and IT service manual's on powersteering. Thanks for the help. Later.

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Clooney

12-29-2002 10:51:50




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 Re: Clooney - P/S Out of Control Update in reply to Blksmok, 12-29-2002 10:08:52  
Blksmok, just pull the worm & sleeve from the gear, then remove the helix screw & the sleeve should wiggle off the back of the worm.



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F-I-T

12-29-2002 10:51:22




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 Re: Clooney - P/S Out of Control Update in reply to Blksmok, 12-29-2002 10:08:52  
Bruce:

There's a spring (F2335R on the late models)that pushes a "cam"lobe to interlock with the notched end of the worm shaft. I think it's a safe guard in case you crank it too far one direction, it will slip out of the notch and allow it to freewheel, but then intermesh again once it's returned to the interlock position.

I'll bet either that spring is broken, or the nut that holds the tension on the end of the spring has worked loose.

Frank-in-Tallahassee
70D // 855

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Clooney

12-29-2002 11:32:30




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 Re: Re: Clooney - P/S Out of Control Update in reply to F-I-T, 12-29-2002 10:51:22  
Frank, that spring & cam is what actually controls the amount of oil flow to the steering vanes. As the steering sleeve it turned by the steering wheel shaft, the spring pressure on the cam tries to keep the cam seated, that in turn keeps the sleeve from easily turning on the worm [makes the worm & sleeve drive as one]. As the manual input turning pressure increases on the steering sleeve, it forces the worm to turn the sector so front wheels can turn, it also starts to unseat that cam & allows the sleeve to turn slightly on the worm. When the sleeve turns on the worm, the helix screw tracking in an angled slot of the worm forces the sleeve to move either fore or aft & that in turn moves the fork on the steering valve either fore or aft & allowing more oil flow to the steering vanes. The greater the steering force between the sleeve & worm the more the sleeve moves fore or aft on the worm so the more steering hydraulic pressure you get to the vanes.....Simple isn't it? ~If for some reason the turning force would exceed the spring force & cam travel, or the cam spring should come loose or break, there are 2 safety pins in the sleeve that float in a slot in the worm & would mechanically lock the sleeve to the worm. Those 2 pins have probably either backed out or are sheared off & probably the helix screw is trashed also. If that spring, cam, or other malfunction occurs in the sleeve/worm area, or too much steering wheel force is put in the system, those pins are supposed to give you manual steering & limit force on the helix.

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F-I-T

12-29-2002 16:00:33




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 Re: Re: Re: Clooney - P/S Out of Control Update in reply to Clooney, 12-29-2002 11:32:30  
Clooney:

Well, I studied the diagram, and I think I got it.

Thanks.

Now, I'm going to have to get around to fixing the lower seal leak on my P/S pedestal on of these days. Everything works fine, no leaks (there is small film around the oil seal area of the steering shaft/actuator sleeve, so it'll get replaced as well).

What should I be on the look out for. I heard you should probably flip the sector gear over to get fresher surfaces. I guess one should replace every rubber part or gasket, too.

The parts book showed a kit.

Do you or anyone else know if this kit is available, and if it contains everything I'd need if it was. THis of course assuming that there are no mechanical surprises.

BTW, I'm STILL fighting that pony clutch. I can get it too tight, anf too loose, but never where I had it after the rebuild. It would spin it on compression, hot or cold, for as long as you wanted to. I'm stumped, but I'm leaning towards that little spring that pushes against the linkage (transmission lever stop spring) as maybe being too weak. Of course it's not available.

Any ideas before I pull the pony and start over ?

Frank

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Clooney

12-29-2002 16:27:57




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 Re: Re: Re: Re: Clooney - P/S Out of Control Update in reply to F-I-T, 12-29-2002 16:00:33  
Frank, the last few times I have purchased steering seals & "0" rings I had to buy separate parts. No big deal as they are rather inexpensive. The biggest things you might run into are worn bushings for the steering shaft & if an early steering setup, the possibility of a vane pin having scored the lower quill top. Maybe even a worn lower spindle thrust bearing.
~On that sector gear; if it is steering good now without a lot of slop & play don't rotate it. If you move it you will have to reset the worm to sector lash. Make sure to mark the gear to spindle shaft BEFORE pulling the gear. The problem is that gear will go on any way you drop it on [not just 180� opposite as the steering stops are in the vane stop pins not the gear] & if gets installed off a spline you will never get it adjusted correctly as it will run from old to new teeth & go from loose to tight while turning. ~Before removing the sector gear, pry the gear up & measure the space between the bottom of the gear & old thrust washer. If excessive you can handle that problem with a thicker thrust washer while reassembling the gear to shaft. [once it's apart it is almost impossible to get it right the first time, & taking it apart again is a big pain].
~On that pony clutch? Can you get it adjusted to pull good but then the brake won't hold the pinion? Or when you say too tight, are you referring to some other problem?

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