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1962 Fordson S Dexta hydraulic problem.

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Tetx

06-03-2000 19:37:51




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I have read DaveW's S Dexta's problem posted 2/21/2000 and all the follow ups. Mine is simular but different.My three point worked okay last season, was slow to respond after setting all night, but always worked after a short warm up. Now it will not come up at all. I have no manual, would like one if I knew where to buy it. It appears there is no pressure getting the piston and is just bypasing back into the case. I have done the following. Checked the pressure at the pump, (100 psi), removed cleaned and inspected the pressure lief valve, on the pump housing, (looked good), removed and inspected the pump, did not disassemble, but the gears looked good and no chips or loosness. Removed the top cover with the cylinder and lifting arms. All the linkage was tight nothing looked to be missing, the piston and ring looked in good shape, I removed and cleaned the valve on the front of the top cover under the plug, it was not dirty and all parts looked good, I removed the valve with the screwdriver slot from the top cover under the assessory adapter,(looked a little dirty, but okay), Put it all back together and it still will not work. Can anyone help, Thanks

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Brian

06-04-2000 05:03:15




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 Re: 1962 Fordson S Dexta hydraulic problem. in reply to Tetx, 06-03-2000 19:37:51  
Tetx,
Have you checked the pump pressure by fitting a gauge to the auxillary output port and pulled the lift lever up beyond the top stop? You should have around 2200psi.
You would have to dismantle the pump and check for wear around the outer area of the gear housing and also the condition of the "O" rings. However your symtoms do not sound like pump wear. The pump would work better cold than hot if it was worn. You did not mention cleaning the pump intake filter. This could be the cause of your problem.
regards
Brian

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billy marlow

01-06-2005 17:30:31




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 Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to Brian, 06-04-2000 05:03:15  
my clutch some time want disingaged what might be the problem? want stop when ingaged keep trying to pull forward?



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Tetx

06-04-2000 14:35:51




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 Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to Brian, 06-04-2000 05:03:15  
Brian: I did clean the intake screen on the pump. The reason I did not check the pressure on the auxillary output port, it appeared I was dropping all the pressure through the auxillary valve for some reason. Not knowing the makeup of the auxillary valve porting, I guess I should have. I will do that next. Thanks, Tetx



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tetx

06-04-2000 19:04:12




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 Re: Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to Tetx, 06-04-2000 14:35:51  
Brian: The pressure check at the outlet port of the auxillary adaptor was "0".



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Brian

06-05-2000 16:14:26




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 Re: Re: Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to tetx, 06-04-2000 19:04:12  
Tetx,
Your problem then must be either "O" rings under the auxillary plate,ram cylinder "O" rings between the cylinder and the top cover or pump. The other possibility is a stuck unload valve. This is behind the plug, above the control valve on the ram cylinder itself. If you decide to look at this DO NOT DRIVE IT OUT FROM THE REAR WITH A PUNCH!!!! Pull the plug from the front using the threaded hole. The oil flow from the pump comes up into the auxillary plate and then down to the control valve, back up to the diverter valve which sends oil either to the ram cylinder or external services. Some aux. plates have a flow control valve or are just a plain diverter. If yours has a flow control valve this could be stuck. As I said earlier you do not sound to have pump or "O" ring problems as the lift would work slower when the oil was hot rather than faster.
Just a thought. What oil have you in the rear axle? Should be Multiuse.
regards
Brian

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tetx

06-06-2000 12:58:52




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 Re: Re: Re: Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to Brian, 06-05-2000 16:14:26  
Brian: About the Oil.I havn't added any oil since I got the tractor, about three years ago, but since this problem I refilled with an oil that looked and smelled similar, called Quatrol No.49 Tractor Hydraulic & Transmission Oil made by Westland Oil. I bought it from Sam's Club. Is this what you mean by Multiuse?



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tetx

06-06-2000 11:44:09




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 Re: Re: Re: Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to Brian, 06-05-2000 16:14:26  
Brian: I had replaced the "O" rings in the areas you mentioned when I did my first inspection, so I'm sure they are okay. I have tried, after you pointed it out, to remove the unloader valve using a bolt in the threaded hole after removing the spring retainer on the control valve, but I can't get it to budge. You said not to pound on it from the rear and I did not. Does the cover just slide out? Do you use the bolt that I threaded in to push it out? Does it maybe have left hand threads on the plug itself? Is there a special technic to get it out? I assume the valve is removed from the front although it is retained from the rear also. I used a small slide hammer connected to the bolt to no avail.You mentioned the flow control valve. Is this the one under the auxillary plate? It has a slotted head on the one I'm talking about, but I'm not sure its the flow control valve. I took it apart and cleaned it up before but it did not appear to be stuck.

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Brian

06-06-2000 14:02:09




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 Re: Re: Re: Re: Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to tetx, 06-06-2000 11:44:09  
Tetx,
The unload valve plug has to be drawn out in some way. A long bolt through a tube that fits over the plug is the best way. To try and drive it out from the rear will damage the valve itself which is machined to very fine tolerances. The valve you have under the aux. plate is the check valve and will give you a problem as you describe if the ball or spring are faulty. The flow control is a knob on the top of the aux plate in a thing that looks a bit like a snail shell on its side with a rod link that goes to a striker in the main lever quadrant. As you move the main lever to the top it moves the flow control.If you have just a flat plate with a knob that pulls out to get aux. services you will not have a flow control.
Have you checked that the linkage moves the control valve through the correct travel? In Qualitrol, with the arms down and the lift lever .5" from the top stop, you should have .5" between the ram cylinder face and the land on the control valve with the little tin hood on it. Adjust the turnbuckle to achieve this.Send me your E-Mail and I will send diagram.
regards Brian.

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Tetx

06-07-2000 21:55:35




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 Re: Re: Re: Re: Re: Re: Re: 1962 Fordson S Dexta hydraulic problem. in reply to Brian, 06-06-2000 14:02:09  
Brian: I got the upload valve out okay. It looked good, very clean and the "O" ring looked like new. I tried to adjust the control valve linkage, but ran into a problem. The valve land was hard against the retainer stop and could not be adjusted to the .5". I used all the adjustment on the turnbuckle but the land was still touching the stop lightly. I put everything back together, started it up and thought it was fixed. The lift came up and appeared to operate normally. I cycled it through several times. I shut down and hooked up the bushhog mower, restarted and it worked just fine. I shut down again and it quit working again. Any ideas ? Did you get my E-Mail address? Here it is again just in case. tetx@worldspy.net. Much Thanks, Tetx

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