Hydraulic flow restrictor

landpride64 · Jun 8, 2016

Looking to add a hydraulic top link to my Kubota L4240. I have found the correct length cat1 piston but need a flow restrictor. On the piston, the fittings are 3/8 npt. Anyone know where to buy a fitting? So it will be from the Pistons fitting, flow restrictor then hydraulic hose.
Thx in advance.

PILOON · Jun 8, 2016

Flow restriction is easy to make.
Braze an appropriate fitting closed and then drill a tiny hole , like 3/32 and your flow will be restricted.\
If that is too slow drill next size up 'til yo get the speed you want.

MtnViewRanch · Jun 8, 2016

landpride64 said:
Looking to add a hydraulic top link to my Kubota L4240. I have found the correct length cat1 piston but need a flow restrictor. On the piston, the fittings are 3/8 npt. Anyone know where to buy a fitting? So it will be from the Pistons fitting, flow restrictor then hydraulic hose.
Thx in advance.

Here ya go.

I would get 1/2" and install up next to the male coupler on the hose. Also you will find that it actually works better to have one on each hose.

aircommuter · Jun 8, 2016

You may check surplus center NE for an adjustable one.

Halftrack · Jun 8, 2016

TSC carries them in the hydraulic fittings dept.

npalen · Jul 24, 2016

What is the cylinder bore diameter? A 2" bore diameter will need an orifice hole diameter of not much over 1/32". A 3/64" diameter might be too large depending on how slow you want the cylinder to operate and the system relief pressure setting.

aircommuter · Jul 25, 2016

Surplus center 3/8 NPT 8 GPM PRINCE WFC-600 IN-LINE FLOW CONTROL
ITEM NUMBER: 9-7960-6. With this you can set where you want and change it when you want.

Tomtint · Jul 25, 2016

I made a snowplow for my Cat out of a old Fisher plow. We has to use flow restrictiors on the angle Pistons. They were purchased at the local machine shop and installed on the hydrolic hoses. Very inexpensive and easy as it gets.

The Fred · Jul 25, 2016

Why would you want one all they do is overload the hydraulic system and if you are moving right along and go to move your top link the flow restrictor just kills the engine and your momentum.

I removed all of mine and tossed them. Mine is an L3940 cab with HST (highly stupid transmission). Yours will do the same. Learn to feather the remote valve you'll be glad you did.

Fred

muddstopper · Jul 25, 2016

I restricted the fitting on wood splitter wedge by tapping the inside of the fitting and screwing in a 3/8 bolt. I sawed the bolt of and then drilled a 1/8 hole thru it to allow oil to flow. cyl is a 1 1/2 in bore with 6in stroke. With full oil flow, it would lift so fast the wedge would jump off the beam. I did use it for a long time just feathering the control, but found that when I was trying to work fast, I would tend to jerk the lever instead of feathering. With the restriction I can jerk the lever all I want and the wedge just lifts nice and slow.

kennyd · Jul 25, 2016

The Fred said:
Why would you want one all they do is overload the hydraulic system and if you are moving right along and go to move your top link the flow restrictor just kills the engine and your momentum.

I removed all of mine and tossed them. Mine is an L3940 cab with HST (highly stupid transmission). Yours will do the same. Learn to feather the remote valve you'll be glad you did.

Fred

Wow your Mr. Positive eh?

FYI it's impossible to "feather" an electric solenoid valve and many extra functions are powered with them.

LD1 · Jul 28, 2016

I went with the adjustable inline flow controls on my recent build. I like the adjust-ability, as well as being able to shut them completely off If I get a cylinder that starts to drift over time.

Midniteoyl · Jul 28, 2016

I was looking at these for my front end loader.. That thing will go from barely moving to slamming the stops in a hurry. Enough to lift the front of the tractor when hitting them fulling raised. Really way too fast.

The Fred · Jul 28, 2016

kennyd said:
Wow your Mr. Positive eh?

FYI it's impossible to "feather" an electric solenoid valve and many extra functions are powered with them.

Yup.......I still HATE my tractor!

Here you go all 30 pages:

http://www.tractorbynet.com/forums/kubota-owning-operating/311706-i-still-hate-my-tractor.html

Piston · Jul 28, 2016

The Fred said:
Yup.......I still HATE my tractor!

Here you go all 30 pages:

http://www.tractorbynet.com/forums/kubota-owning-operating/311706-i-still-hate-my-tractor.html

Here's a thought....

Sell it.

David_Kb7uns · Jul 28, 2016

kennyd said:
Wow your Mr. Positive eh?

FYI it's impossible to "feather" an electric solenoid valve and many extra functions are powered with them.

Not impossible to feather an electronic solenoid valve, it is just not cheap, my GL3130 modulates the solenoid for the hydraulic clutches every time it shifts.

David

midwesternhayfarmer · Aug 1, 2016

muddstopper said:
I restricted the fitting on wood splitter wedge by tapping the inside of the fitting and screwing in a 3/8 bolt. I sawed the bolt of and then drilled a 1/8 hole thru it to allow oil to flow. cyl is a 1 1/2 in bore with 6in stroke. With full oil flow, it would lift so fast the wedge would jump off the beam. I did use it for a long time just feathering the control, but found that when I was trying to work fast, I would tend to jerk the lever instead of feathering. With the restriction I can jerk the lever all I want and the wedge just lifts nice and slow.

Tap the inside of the fitting as stated for whatever thread that will work but use the shortest setscrew you can get. Drill the orifice in the setscrew and screw in till the threads bottom. The setscrew is removeable if the orifice is too large or can be made larger.

IceStationZebra · Aug 1, 2016

midwesternhayfarmer said:
Tap the inside of the fitting as stated for whatever thread that will work but use the shortest setscrew you can get. Drill the orifice in the setscrew and screw in till the threads bottom. The setscrew is removeable if the orifice is too large or can be made larger.

I have worked for several off-road OEM engineering departments and this is what we did with prototypes. If the threads as a little loose just add a couple drops of red loctite.

If you really want to get fancy there are some one-way restrictors built into fittings so you can tailor each direction seperately, but I don't know where they bought them. They were a floating disc trapped in the fitting that would restrict one way but free flow the other. Used them one corn planter markers.

ISZ