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Massey Harris & Massey Ferguson Tractors Discussion Forum
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135 power steering question

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Bob S

12-06-2004 14:00:53




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problem is a P.D.O. tried to ''weld'' the power rack guide cover to the steering box casting because they probably stripped the threads in housing,it don't look good.do you think i can have ''studs'' welded in place of the threads also how much pressure is on that cover? as always any and all ideas appreciated




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Sam Henderson

12-07-2004 17:15:47




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 Re: 135 power steering question in reply to Bob S, 12-06-2004 14:00:53  
Another followup. I have seen your other postings on your power steering questions and thought maybe I could help with some explaination on how it works. The pump should be able to produce around 1000 to 1100 psi. There is a relief adjustment in the pump but it probable is fine. Two hoses are connected to the steering column valve, The pressure line is toward the front of the tractor and the return line is connected to the rear port(it also has a check valve inside this port to relieve the oil in the system if the steering wheel is turned when the tractor is not running, this check valve must be there or you will not have any pressure for the power steering when the tractor is running. When you turn the steering wheel to the right the column shaft threads downward through the ball rack thus moving the valve spool downward shifting pressure to the front(of the tractor) of the piggyback power steering cylinder. The power rack is forced toward the back of the tractor rotating the sector shafts. Since the cylinder has a rod connecting it to the rack the force from the hydraulic is not equal and that is why it reacts easier turning to the right than to the left. At the same time the ball rack is repositioning the steering column shaft to "null" the valve spool. Vertical movement of the steering shaft is only 1/8" or 3/16" at the most. The length of the valve spool controls this overall movement since there are thrust bearings on either side of the spool. I have a MF 202 TLB which had lousy power steering because the top seal leaked and I had corrosion(rust)on this spool and the valve body. Replacement valves cost $600 so I rebored the valve body(+.030")and cut a larger diameter spool to fit. The spool is soft but it works great now. I hope I didn't confuse you. Sam

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DavidP, South Wales

12-07-2004 13:28:38




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 Re: 135 power steering question in reply to Bob S, 12-06-2004 14:00:53  
Different terminology over this side of the pond.
Assume you are referring to the threaded holes in the steering box casing which hold the cover on. The rack that you mention is/are the rocker shafts There should be plain dowels between the cover and box. These give exact location for the cover and take a lot of the load which is more than on a manual tractor. As Sam has suggested it might be possible to drill and tap for a larger size, 1/2" UNC. You may just be able to drill the case for the larger size or have reduced studs made. Shouldn't be too expensive. For the power steering to work properly there should be virtually no wear in the rocker shafts and steering column other than the movement to actuate the steering.
David P

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Sam Henderson

12-06-2004 14:21:50




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 Re: 135 power steering question in reply to Bob S, 12-06-2004 14:00:53  
Maybe you could drill out the holes and retap to the next larger size if there are no threads left.



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