Ford 7840 no hydraulics

[Jonny J]

Tractor just quit moving. No hydraulics/linkage working. Transmission oil pressure light on in dash. Power steering working perfect. Changed all filters but no better. Tractor has closed centre hydraulics. Any thoughts?
Thanks

 

[del_boy]

Low oil pressure, could be the pump giving up, or a valve stuck. you'll need someone to pressure test and go from there

 

[domcliveandrew]

So Is she SLE with the 3 hydraulic filter all on the same side?

 

[Jonny J]

Yes SLE and 3 filters on the side. All 3 filters were changed and made no difference

 

[domcliveandrew]

No engine pump then. There is a valve that drops out under the side cover but it shouldn’t effect the linkage, been a while since I did one![emoji23] the new filters you’ve put on, is the pump filling them with oil?

 

[Jonny J]

Will screw off filters again and see if any oil in them

 

[Gruffalo]

Is 1 of your spool levers in the float position ?

 

[Tomtrac]

Is 1 of your spool levers in the float position ?

I used 40 series a lot
May i ask what difference it will make if the spool in float or not just wondering

 

[Jato]

If spool coupler has not closed properly, have known it possible to draw air in if in float and cause symptoms like this.

Try massive over filling the oil in back end, just as a test. Then restore to correct level.

 

[Jonny J]

Just an update. Plugged a hose into spool valve and tried to pump oil into drum. All of a sudden it started to pump oil. A bit foamy at the start but soon cleared. Tractor now working perfect. I guess it had somehow air locked
Thanks for all replies

 

[Gruffalo]

Just an update. Plugged a hose into spool valve and tried to pump oil into drum. All of a sudden it started to pump oil. A bit foamy at the start but soon cleared. Tractor now working perfect. I guess it had somehow air locked
Thanks for all replies

We have had this happen a few times with one of the scvs not closing properly so allowing air to be drawn in. Glad you’re sorted.

 

[Tomtrac]

Just an update. Plugged a hose into spool valve and tried to pump oil into drum. All of a sudden it started to pump oil. A bit foamy at the start but soon cleared. Tractor now working perfect. I guess it had somehow air locked
Thanks for all replies

I wish all my mends/problems where fixed as cheaply well sorted you must be well over the moon

 

[Jonny J]

Yes hopefully that’s it. Luck was on my side!!! Thanks for all your help guys

 

[Badshot]

There's a gasket on the transmission that goes and means very clunky gear changes. Oil light flashes on and off

 

[Jonny J]

Where is this gasket? I have noticed that every time you press the button for a gear change or let out the clutch pedal the transmission oil pressure light gives a quick flicker on

 

[agrimax]

Oil light flashing like that can be quite normal on the sle 40 series,even with a good gasket....
The gasket is on the control valve side plate where the transmission solenoids are mounted.

 

[agrimax]

https://partstore.agriculture.newho...a5155f8e&sl=EN&currency=#epc::mr57148ar396581

Pt no.3 for a quad mod.

or
https://partstore.agriculture.newho...a5155f8e&sl=EN&currency=#epc::mr57148ar396558

Pt no.54 for a pre-quad.

 

[Markb123]

Tractor just quit moving. No hydraulics/linkage working. Transmission oil pressure light on in dash. Power steering working perfect. Changed all filters but no better. Tractor has closed centre hydraulics. Any thoughts?
Thanks

https://partstore.agriculture.newho...a5155f8e&sl=EN&currency=#epc::mr57148ar396581

Pt no.3 for a quad mod.

or
https://partstore.agriculture.newho...a5155f8e&sl=EN&currency=#epc::mr57148ar396558

Pt no.54 for a pre-quad.

No engine pump then. There is a valve that drops out under the side cover but it shouldn’t effect the linkage, been a while since I did one![emoji23] the new filters you’ve put on, is the pump filling them with oil?

Hi I have a 1994 ford 8340 sle with no power steering . Low pressure oil light comes on the second you touch the steering wheel . You can turn the wheel once you rev the tractor. Is there another low pressure filter other than the one down by the pump anywhere or has anyone come across this problem before? Thanks

 

[agrimax]

Just the three filters on the pump. The smaller vertical one to the rear being the steering filter.....

 

[forblue]

If it has the ccls pump, get a pressure check, easy to do just connect pressure gauge between one hose to power steering ram on front axle,eng 1000rpm max press 4/w/d 172bar but sounds like it will be low, which will be pump, i have never had problem with steering on these but it's just possible it could be the prv [in orbital motor that is faulty this can be checked by pressure checking pump to motor supply but remember gauge needs to be between the two and not dead head it as if you do it will blow pump........