MF 100 series Hydraulic Pump

[aidan]

I have to remove the lift cover on our MF168 to replace the seals in the lift cylinder piston.

Mechanic tells me I should do the hydraulic pump and fit new lift control valve while the tractor is open.

Rang MF to get a rebuild kit for the pump, how do I figure out if its a 6 spline or 10spline input shaft. (A new pump is €1200 for 6spline and €2300 for 10 spline from MF) will go the rebuild route I think at those prices.

Pump currently working fine only thinking of doing some work while the lift cover is removed.

Tractor Serial number 261058, which I think is 1978 build.
8 speed transmission - No Multipower
Square Axle, internal wet breaks, Lambourn Cab

 

[Tractortech]

Now Then..
Why are you replacing the lift cylinder seals?? As I recall, they are a metal piston ring. If they drop overnight, that how they are.. Other than that, I know very little..

 

[aidan]

Now Then..
Why are you replacing the lift cylinder seals?? As I recall, they are a metal piston ring. If they drop overnight, that how they are.. Other than that, I know very little..

upgrading fertilizer spreader which will have hydraulic controls. currently with 500kg on the lift arms they will drop to the floor in 5mins.

there is an upgraded lift cylinder piston with rubber seal which i will fit in place of the original with the piston rings

 

[trebornella]

MF 168 will have piston ring rather than rubber seals. 5min drop with weight on is not bad. Better to have a pressure / flow test carried out before stripping it. May be nothing wrong with the pump.

 

[MF-ANDY]

I have to remove the lift cover on our MF168 to replace the seals in the lift cylinder piston.

Mechanic tells me I should do the hydraulic pump and fit new lift control valve while the tractor is open.

Rang MF to get a rebuild kit for the pump, how do I figure out if its a 6 spline or 10spline input shaft. (A new pump is €1200 for 6spline and €2300 for 10 spline from MF) will go the rebuild route I think at those prices.

Pump currently working fine only thinking of doing some work while the lift cover is removed.

Tractor Serial number 261058, which I think is 1978 build.
8 speed transmission - No Multipower
Square Axle, internal wet breaks, Lambourn Cab

How did you know it was lift cylinder seals? which as said leak anyway. Could be selector valve leaking or pressure control valve or stack pipe orings or main control valve.

 

[aidan]

How did you know it was lift cylinder seals? which as said leak anyway. Could be selector valve leaking or pressure control valve or stack pipe orings or main control valve.

i dont know TBH other then its the likely suspect and in there since 1979. lift falls down at same piece when 3 way valve is turned to lock out the lifts.

is there a way of checking ?

 

[MF-ANDY]

i dont know TBH other then its the likely suspect and in there since 1979. lift falls down at same piece when 3 way valve is turned to lock out the lifts.

is there a way of checking ?

If you've locked out using the selector valve it probably is the lift cylinder seals but as said they leak anyway

 

[Andy Nash]

upgrading fertilizer spreader which will have hydraulic controls. currently with 500kg on the lift arms they will drop to the floor in 5mins.

there is an upgraded lift cylinder piston with rubber seal which i will fit in place of the original with the piston rings

I presume you can’t use position control on your linkage and operate the hydraulic control at the same time, which is why you want to stop the leaks in the linkage circuit. It seems that it is designed to leak, so can you not fit a spool valve instead?

 

[aidan]

I presume you can’t use position control on your linkage and operate the hydraulic control at the same time, which is why you want to stop the leaks in the linkage circuit. It seems that it is designed to leak, so can you not fit a spool valve instead?

Exactly

Legacy problem from original Ferguson 65 from 25yrs ? Previously. Leyland of the same vintage has the same rrangement.

300series MFs have rubber seal per agco part. Piston might be different size.

 

[serf]

upgrading fertilizer spreader which will have hydraulic controls. currently with 500kg on the lift arms they will drop to the floor in 5mins.

there is an upgraded lift cylinder piston with rubber seal which i will fit in place of the original with the piston rings

Pre 80s we used to have two brackets and chains that would hang from top link pin to lower link arms of spinner to fix it solid and stop it dropping on 135.

 

[aidan]

Pre 80s we used to have two brackets and chains that would hang from top link pin to lower link arms of spinner to fix it solid and stop it dropping on

Probably worked but a bit labourious come refill time

 

[Hair Bear]

What about the 'Ferguson mower' top link?

 

[aidan]

What about the 'Ferguson mower' top link?

I'd rather avoid cumbersome solution

It would work

 

[serf]

Probably worked but a bit labourious come refill time

Used to have cwt bags on trailer so height was same as spinner

 

[MF-ANDY]

upgrading fertilizer spreader which will have hydraulic controls. currently with 500kg on the lift arms they will drop to the floor in 5mins.

there is an upgraded lift cylinder piston with rubber seal which i will fit in place of the original with the piston rings

So you are feeding spool valves from the linkage pump through the selector valve to work for new spreader?

 

[Andy Nash]

So you are feeding spool valves from the linkage pump through the selector valve to work for new spreader?

Won’t a 168 have twin pumps?
If so, surely it should be possible to operate an independent spool valve?

 

[MF-ANDY]

Won’t a 168 have twin pumps?
If so, surely it should be possible to operate an independent spool valve?

That's what I was thinking

 

[aidan]

Won’t a 168 have twin pumps?
If so, surely it should be possible to operate an independent spool valve?

That's what I was thinking.

No multi power so only single pump.

If I had 2 pumps then i could arrange things to get one pump hold up the lifts and the 2nd operate the spool valve, but unfortunately I dont.

Arrangement will be as per photos

• 3 way valve set to External 2 position. In the photos its set in the position to lift the lift as normal.
• Feed from External 2 on the 3way valve feeding Spool Valve Block mounted on the mudguard.
• Spool Valve block has a Single Acting Spool, Middle Spool is Blanked off and 3rd Spool is a double Acting Spool. Can only see one female end of the double acting spool in the photo, the other female end on the double acting spool is underneath and out of picture.
• When piped up as per my photos and the 3way valve in External 2 position, when I operate the Single Acting spool oil is sent back into the 3 way valve and to the lift cylinder allowing it to be lifted up and down.
• The double acting spool will allow me to open close the fertilizer spreader.

With this arrangement I should have stack pipe and control valve out of the equation and Im entirely dependant on Single Acting Spool, 3 way valve and seals in the lift cylinder ?


I did a little test today and pump is putting out 3250psi, not bad for 1979, within the last 150made as per the serial number. Pump is Type 3, 3 bolts underneath which have to be removed to change the filter.

 

[MF-ANDY]

Not sure about that selector valve but if it was a genuine fergie one you could feed your spools from one if the no1 ports. That way your arms would be locked in the raised position and they would be topped up everytime you dead ended a spool valve. This feature was designed to keep a ballast weight raised when using a 40 loader with each ram piped into a no1 port.

 

[Andy Nash]

You would be better buying something like an IH 475 which would work properly and you would still have a Perkins engine. Fert is too expensive to waste because your tractor isn’t up to the job.