MF 100 series Hydraulic Pump

[aidan]

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.

that would be the fully raised position ?

thats the 3 way valve it came with when new, dont think it does as you describe from what I recall from when we had a front loader fitted.

am I correct when I say when the 3 way valve is in external 2 position, stack pipe and control valve are taken out of the equation.

 

[MF-ANDY]

that would be the fully raised position ?

thats the 3 way valve it came with when new, dont think it does as you describe from what I recall from when we had a front loader fitted.

am I correct when I say when the 3 way valve is in external 2 position, stack pipe and control valve are taken out of the

Dont know about that valve but with a fergie valve yes. If you raise the arms then switch to ext2 the stack pipe etc are not connected,
However in the valve there is a shock valve that can become weak and leak oil from the cylinder.

 

[aidan]

shock valve - is that part of the 3 way valve or in the control valve

 

[MF-ANDY]

shock valve - is that part of the 3 way valve or in the control valve

Fergie 3 way valve. Not sure about yours. It's there because once you select ext 2 the cylinder is isolated from the pressure control valve so there is nowhere for the oil to go if the cylinder gets a shock loading like bouncing over a rough field carrying a heavy weight. The shock valve is set above relief pressure but can become weak.

 

[aidan]

Fergie 3 way valve. Not sure about yours. It's there because once you select ext 2 the cylinder is isolated from the pressure control valve so there is nowhere for the oil to go if the cylinder gets a shock loading like bouncing over a rough field carrying a heavy weight. The shock valve is set above relief pressure but can become weak.

i have an ordinary set of spool valves same as would be used to operate a loader etc, would it have shock valves built in.

 

[MF-ANDY]

i have an ordinary set of spool valves same as would be used to operate a loader etc, would it have shock valves built in.
Shock valve is in genuine fergie selector valve. Don't know about yours

 

[aidan]

Currently have the piston with rubber seal here and trying to get it into the cylinder and having huge problems.

The white plastic seal seems to have expanded a bit with the stretching to fit it over the piston. Can compress it back with piston ring compressor tool.

However there is a protruding edge on the cylinder so can't get close enough with the piston ring compressor tool to make it slip in nicely.

Any ideas

 

[MF-ANDY]

We had proper tapered sleeves for the job

 

[aidan]

We had proper tapered sleeves for the job

Can I buy such an item or fabricate even

 

[MF-ANDY]

They were supplied by Churchill. I guess a machine shop could make one. We used to push the piston into it which squeezed the ring in, then place the tool on the end of the cylinder and push the piston in.

 

[two-cylinder]

An outside of box option, would be to fabricate some linkage stands to hold linkage in raised position.
We have a set made by sprayer firm Dorman's of Ely, were supplied with a sprayer in the 60s and used on our 35.
Worked a treat never had to worry about linkage sinking.

 

[Celtic Driver]

Currently have the piston with rubber seal here and trying to get it into the cylinder and having huge problems.

The white plastic seal seems to have expanded a bit with the stretching to fit it over the piston. Can compress it back with piston ring compressor tool.

However there is a protruding edge on the cylinder so can't get close enough with the piston ring compressor tool to make it slip in nicely.

Any ideas

Why not use the old piston with new rings .

 

[aidan]

Why not use the old piston with new rings .

That's a designed to leak setup

 

[aidan]

Why not use the old piston with new rings .

this is what we ended up doing as couldn't get in the rubber seal, no one even MF themselves had the tool to fit the seal.

 

[aidan]

I want to move where i feed the oil from the spool valve as shown in photo to the plug marked with red arrow. Anyone any idea what type of thread that is on the plug. Manuals I find online mentioning 3/8 NPTF.

Would that be correct ?

Hydraulic shop not sure what NPTF is, is it the same as NPT

 

[MF-ANDY]

Why do you want to feed spool oil in there?
It is a pressure port.

 

[MF-ANDY]

this is what we ended up doing as couldn't get in the rubber seal, no one even MF themselves had the tool to fit the seal.

Probably no one left at the dealer who knows what the tools look like or possibly scrapped them.

 

[aidan]

Why do you want to feed spool oil in there?
It is a pressure port.

The plug in question is linked to the lift cylinder so when the 3 way valve is in External 2 position and i feed/remove oil from that port via the spool valve it will move the lift arms up and down.

See my original photo attached of our arrangement. I have been advised that the hose impedes turning on off PTO and I should move it to an out of the way location. thus I was going to move it over to the opposite side where it is out of the way. I want to fit a straight male fitting where the red arrow, and put elbow on the end of the hose, and then everything is tidied up out of the way.

 

[MF-ANDY]

The plug in question is linked to the lift cylinder so when the 3 way valve is in External 2 position and i feed/remove oil from that port via the spool valve it will move the lift arms up and down.

See my original photo attached of our arrangement. I have been advised that the hose impedes turning on off PTO and I should move it to an out of the way location. thus I was going to move it over to the opposite side where it is out of the way. I want to fit a straight male fitting where the red arrow, and put elbow on the end of the hose, and then everything is tidied up out of the way.

The threads on both sides are the same. They are tapered 3/8"bsp. Any decent hydraulic shop should sort you out. The one you are using atm is just a normal 3/8"bsp

 

[aidan]

To update on this, tractor wouldn't lift fert spreader with 400kg on board, 650kg in total.

Pump giving 3000psi per my gauge when plugged into trailer tipping point.

Only 1500 psi going to lift cylinder when supplied from any source be it the regular lift quadrant or feeding in the pick up point at the side or the spool valve.

Left half ton hanging on drawbar hitch unlocked last week and lift arm ends crept down 100mm in 15- 20min. Ram cylinder seal Must be ok with that performance is it.?
Must retry this exercise.

where else could it be leaking internally I wonder, would that slider arrangement at the dipstick influence anything.

INternal maintenance completed
NEw ram cylinder and piston.
new piston ring
new control valve down at the pump.

@Mfandy