MASSEY FERGUSON HYDRAULIC AUXILIARY FILTER

[Slackdogg69]

Hi,
New to this so please bear with me....

Decided to change the hydraulic filters on our 390. Although the hydraulics work they are overdue and lost a bit of power on the loader (can’t push down to lift front wheels anymore, but will lift very heavy weights even if you feel a little sea sick afterwards).
I replaced the main filter under the gearbox easy enough didn’t look bad at all and all the old looked clean when draining.
I’m struggling to find the location of the hydraulic auxiliary filter. Tried to google pictures but it keeps showing 135 info. I’m sure it will be easy to find once I’m looking at it!
Any help locating it or advice on will be most appreciated.

Thanks in advance

 

[feilding]

From memory. Isn't there a screw on filter on right side of engine,??. Should be changed every 250 hrs or every 12 months if I remember right , same time as engine service.

 

[Still Farming]

Centrifugal one possibly?

 

[Cowabunga]

Centrifugal one possibly?

Did the centrifugal filter appear on the 12x12 390 before the 4200 series? I'm not sure. If it isn't obvious on the side of the engine, then maybe?

 

[agrimax]

Could this be the one you're after?

Hydraulic Filter 390-4270 Etc (Genuine)

Hydraulic Filter 390-4270Hydraulic Filter 390-4270 Etc (Genuine) - Hydraulic filter to suit 390-4270 tractors.

www.mftractorspares.co.uk

 

[agrimax]

Or this one?

 

[Cowabunga]

Could this be the one you're after?

Hydraulic Filter 390-4270 Etc (Genuine)

Hydraulic Filter 390-4270Hydraulic Filter 390-4270 Etc (Genuine) - Hydraulic filter to suit 390-4270 tractors.

www.mftractorspares.co.uk

That's the one under the belly of the tractor. I just wash that one in diesel usually and replace. It takes some extreme sh!t to restrict flow through that mesh.

 

[Cowabunga]

Or this one?

I'd be amazed if the OP had missed that rather obvious hydraulic filter, hence my doubt about later tractors gaining the centrifugal filter which is under the cab just in front of the axle. No replaceable element in that one but it does require the cover removed and all the hard black gunk removed periodically, if fitted. It should be audible as it spins down when the engine is stopped if there is one and it works.

 

[MF-ANDY]

There are 3 hydraulic filters. The one under the centre housing above the triangle plate which filters oil for the linkage pump and guessing that's the one you've found. This won't affect your loader. Then there's the spin on filter on the rh side of the engine. Iirc this is on the steering return line so again won't affect your loader. The one you've missed is another washable gauze in the suction line from the centre housing to the aux pump. Follow the large suction pipe rearward from the aux pump, behind the battery then you will see a housing with 4 13mm headed bolts on the rear. The filter is in this housing. As said the centrifugal filter didn't come in till 4200 series.

 

[Slackdogg69]

There are 3 hydraulic filters. The one under the centre housing above the triangle plate which filters oil for the linkage pump and guessing that's the one you've found. This won't affect your loader. Then there's the spin on filter on the rh side of the engine. Iirc this is on the steering return line so again won't affect your loader. The one you've missed is another washable gauze in the suction line from the centre housing to the aux pump. Follow the large suction pipe rearward from the aux pump, behind the battery then you will see a housing with 4 13mm headed bolts on the rear. The filter is in this housing. As said the centrifugal filter didn't come in till 4200 series.

Fantastic that’s exactly what I’m trying to find. Hopefully it will help the loader, got to easier than doing the pump...

 

[Slackdogg69]

Thanks for all the help everyone.

I have a love hate relationship with our 390! It’s only done around 2500 hours and seems to be going up in value. If I keep it for another 25 years it might be worth what we paid in 1996

 

[agrimax]

That's the one under the belly of the tractor. I just wash that one in diesel usually and replace. It takes some extreme sh!t to restrict flow through that mesh.

That's the one that Andy has shown in the diagram.

 

[shumungus]

@MF-ANDY is correct. Happen to have a 300 series in the workshop today for full service. Pics of the three filter locations and the part number and pic of the filter the OP hasn't changed yet. And just to add I wouldn't wash any of the filters, throw them away and replace, that's what has always been done on this tractor and its just about to turn 20000hrs.

 

[multi power]

@MF-ANDY is correct. Happen to have a 300 series in the workshop today for full service. Pics of the three filter locations and the part number and pic of the filter the OP hasn't changed yet. And just to add I wouldn't wash any of the filters, throw them away and replace, that's what has always been done on this tractor and its just about to turn 20000hrs.

100% correct to throw away the filter and replace
I've seen a new hydraulic pump fitted, made no difference, once the previously washed filter was replaced all was fine

 

[Slackdogg69]

Finally got the right filter. Many thanks for the part number.
The dirtiest filter I’ve ever seen! Still hasn’t got the power it used to have when pushing down, but lifts easily.
Really appreciate all the help received here, saved a lot of head scratching.

 

[Slackdogg69]

There are 3 hydraulic filters. The one under the centre housing above the triangle plate which filters oil for the linkage pump and guessing that's the one you've found. This won't affect your loader. Then there's the spin on filter on the rh side of the engine. Iirc this is on the steering return line so again won't affect your loader. The one you've missed is another washable gauze in the suction line from the centre housing to the aux pump. Follow the large suction pipe rearward from the aux pump, behind the battery then you will see a housing with 4 13mm headed bolts on the rear. The filter is in this housing. As said the centrifugal filter didn't come in till 4200 series.

So would it be most likely that the pump (1 in the diagram) has started to fail due to poor maintenance on my behalf? Don’t mind changing this one looks fairly straight forward if it could improve it.

 

[MF-ANDY]

Yes that one feeds steering, low pressure systems and spool valves.

 

[Mur Huwcun]

If it’s not pushing down are you sure your spool is travelling correctly? Has it got a joystick setup? Levers or tractor spools using the loader. If it lifts heavy loads it should push down.

 

[Pennine Ploughing]

OK so you have got the filters all clean, all this came about because the loader won't lift the front wheels, yet as you say it will lift and carry heavy weights, in that case it don't point to the pump as you ask,
The same pump, filters, oil and system does all the lifting and pushing down, so there sounds like another problem, to start with fit a test gauge to the lift pipe to the loader before the T in the pipe that splits the oil to each ram on loader on the lift side, start the tractor and operate the spool valve to lift loader, this should raise to gauge to the pressure reading of the pump, IIRC 200 bar or 2800 psi or there abouts ( i don't have the book here, so someone might know the correct value of this, ) take note of the reading,
Now do the same on the pressure down side of the oil feed, again fitting the test gauge before the T in the pipe, and start the tractor and move the leaver to drop position and not the value, and compare to the first reading, if both readings are similar and above 170 bar or 2300 psi, then nothing wrong (may be a bit low, but its lifting and working enough for yourself, just not pushing down as you would like) and leave it as it is,
If the drop side pressure is low, it could be the spool is not travelling far enough to engage the pressure feed to lower it, or I have seen dump / overload valves fitted between the spool valve and T in the pipework to protect and reduce downward force, this may be faulty due to dirt ingress and letting the oil pressure away, however unlikely on this age of tractor and loader, but check for one,,
Assuming both pressure readings are the same, then its one or both rams internally that is letting oil flow bypass the ram seal, causing an internal leak, this is possible, but unlikely as it would affect the lifting side as well I would imagine,
Although you have changed the oil and filters, which is a good thing to do, this is not the problem with the loader not pushing down

 

[MF-ANDY]

Are you running the loader off the tractor spools?
If yes, take out the single acting/double acting tap on the valve, replace its oring and after refitting screw it in tightly.