Hydraulic Spool lever?

[GAM]

Can someone explain what the knurled nut and spring adjustment is for?
And also what the plastic nob marked 1&2 under the lever is for?

 

[ridger]

Does plastic thing alter flow rate?

 

[GAM]

Does plastic thing alter flow rate?

Sorry I don’t know, that’s why I’m asking the question.

 

[mixed breed]

I think I'm right in saying that the Plastic knobs change from single to double acting.

The knurled screws can be wound in to hold lever in a pressurised position to opperate an external circuit.

 

[milkloss]

I'm wondering if the plastic knob is to adjust flow And/or maximum movement of the plunger and the spring is to adjust detent pressure.

 

[agrimax]

Yes,the plastic knob is for single or double acting and the screw with the spring is for detent pressure.......

 

[GAM]

What is “detent pressure “?

 

[agrimax]

Operate the lever and release it and it returns to neutral. Put pressure on the spring with the screw and when operated,the lever will stay engaged. The detent is a catch involving ball bearings which in this case is adjustable. If you want to operate a hydraulic motor constantly,you'd want the lever to stay locked in.If you were tipping a trailer,you'd want the lever to return to neutral when the ram is at full stroke.

 

[GAM]

Operate the lever and release it and it returns to neutral. Put pressure on the spring with the screw and when operated,the lever will stay engaged. The detent is a catch involving ball bearings which in this case is adjustable. If you want to operate a hydraulic motor constantly,you'd want the lever to stay locked in.If you were tipping a trailer,you'd want the lever to return to neutral when the ram is at full stroke.

Thank You, very well explained, does that mean I have float on my spool valve if I wind the knurled knob down?

 

[agrimax]

I would say yes,but the other knob would also need turned to single acting.....I think.

 

[shumungus]

Can someone explain what the knurled nut and spring adjustment is for?
And also what the plastic nob marked 1&2 under the lever is for?

Looks like a set of Kontak valves on a Sankey cabbed 200 series Massey.
Plastic knob screw in for double acting, screw out for single acting.
Knurled metal knob screw in when spool in neutral to stop accidental use.

 

[GAM]

Looks like a set of Kontak valves on a Sankey cabbed 200 series Massey.
Plastic knob screw in for double acting, screw out for single acting.
Knurled metal knob screw in when spool in neutral to stop accidental use.

Exactly right, MF200 series.
The plastic knob only turns a 1/4 of a turn, should there be more rotation?

 

[shumungus]

Exactly right, MF200 series.
The plastic knob only turns a 1/4 of a turn, should there be more rotation?

Should turn about two full turns i think. They were inclined to stick if you left them right at either end of their threads. When changing over always back them off the end of rotation a wee bit.
See what way each valve is set and then cotch the shaft behind the plastic knob with a pair of vice grips and help it in the right direction. If try the knob its self it wont survive.

 

[agrimax]

So the screw and spring will only lock the lever in neutral then and not in operating position? @shumungus

 

[shumungus]

So the screw and spring will only lock the lever in neutral then and not in operating position? @shumungus

If you tightened it down I suppose it would have locked the lever 'in work' but in my experience those little aluminum castings didn't like much stress. I think there was a groove in the spool plunger shaft at neutral.

 

[agrimax]

Ah,I see.Not actually a ball bearing detent then..
Apologies to GAM.Maybe not advisable to use it for float then......

 

[GAM]

Should turn about two full turns i think. They were inclined to stick if you left them right at either end of their threads. When changing over always back them off the end of rotation a wee bit.
See what way each valve is set and then cotch the shaft behind the plastic knob with a pair of vice grips and help it in the right direction. If try the knob its self it wont survive.

I have just eased the shaft holding the knob very slightly and it turned, I did all three, they are all turned clockwise in the direction marked 2 fully, I then counted the number of turns anti-clockwise in the direction 1, and they are all 6 full turns!
I’ve only had the tractor six years and have only just spotted these, as I’m trying to workout how I can set them to float...
can I achieve float with these valves?

 

[shumungus]

Yes, of a sort, you can put a detent kit on any valve this gets rid of the spring return but leaves the valve handle that it has three positions, fully up, middle, fully down. If you have the valve on single acting and fully down it will act as 'float'.