Case 580 CK Swing Cylinder flow restrictor ?

[1woody]

I am rebuilding the swing cylinders on my 580 CK and have found flow restrictors installed at the 90degree elbows where the hoses connect. The flow restrictors are set in the cylinders and are easily removed. My concern is that they both seem to have been moving between the 90 degree fitting and the seat in the cylinder. I am wondering if when they are reinstalled should I tighten the 90 degree fitting that has a lock nut tight/snug on the flow restrictor or let the restrictor "float"? I have the manual but can't find any reference to how this should fit.

 

[J_J]

I don't believe the restrictor is supposed to float, as the purpose of a restrictor is to let a certain amount of fluid go through the orifice.

http://qualityfarmsupply.com/t/cate...d-hydraulic-adapters/flow-restrictor-adapters

http://www.tractorbynet.com/forums/...lic-flow-reducer-do-they-jd-restrictors12.jpg

 

[1woody]

Thanks for the reply. My thought was that the restrictor was to be stationary also but today I tried and experiment. I placed the restrictor in the cylinder and attached a string to it and threaded the string through the elbow. I then screwed the elbow into tne cylinder as far as it could go with the lock nut backed off. I pulled on the string and the restrictor moves about 3/16". The reason I questioned this at first was that there seem to be wear marks on the restrictor and the elbow. I asked the mechanics at Case but none remember an old machine like my 580CK. I was hoping that someone might have a service manual that has a better description of how this should work .

 

[J_J]

It may be that the restrictor is stable/seated in one direction, and floats in the other direction.

Otherwise, more flow in one direction.

You could however replace that assembly with a solid adapter orifice if you want same restriction in both direction. .

http://www.greenlinehose.com/_pdf/pulsar/price_list/check_valve_price.pdf

 

[oldnslo]

I am rebuilding the swing cylinders on my 580 CK and have found flow restrictors installed at the 90degree elbows where the hoses connect. The flow restrictors are set in the cylinders and are easily removed. My concern is that they both seem to have been moving between the 90 degree fitting and the seat in the cylinder. I am wondering if when they are reinstalled should I tighten the 90 degree fitting that has a lock nut tight/snug on the flow restrictor or let the restrictor "float"? I have the manual but can't find any reference to how this should fit.

Since you have two cylinders the restrictors only work in one direction and allow a free flow function in the other. This allows for meter out control to prevent rapid swing movement and a more controlled swing movement.

 

[IceStationZebra]

When I worked for CaseIH we put one-way flow restrictors on cylinders on several different occasions. It is much cheaper than a separate fitting, plus if people don't know it it there they will probably leave it alone. But I will say that the one you show is much more expensive than the ones I used. We used them mostly for speed control on heavily loaded cylinders that were pushing against gravity, but in your case I'm guessing they help prevent cavitation.

As a side note you may run across an orifice with a small piece of wire, or similar, in it. I have never used them but I hear that the "jiggle pin" prevents debris from plugging the hole.

ISZ

 

[Willl]

should I tighten the 90 degree fitting that has a lock nut tight/snug on the flow restrictor

Is that even possible ?

I thought the O-ring was in a fixed position.

 

[J_J]

Type in

hydraulic restrictor fittings

Select images

 

[wdchyd]

The restrictor should float

 

[J_J]

I thought they floated also, but came across this.

It looks like some of the restrictor have a spring associated with them.

http://www.princehyd.com/Portals/0/Valves.pdf

Pages V10 ,V28

It mentions restrictor and conical spring.

 

[wdchyd]

I thought they floated also, but came across this.

It looks like some of the restrictor have a spring associated with them.

http://www.princehyd.com/Portals/0/Valves.pdf

Pages V10 ,V28

It mentions restrictor and conical spring.

That series 20 valve looks like a Gresen hyd valve....is it possible Prince bought that from Parker (Gresen)..??

and yes, some manufacturers use springs, especially velocity fuse (hose-break) valves on forklift cyls

 

[1woody]

I did get a blow up of the parts schematic today and there was no spring in the restrictor assembly. I am now convinced that from the responses above that this particular restrictor should "float". I spoke to an old timer today and he said that the restrictor was used to prevent erratic movement of the boom. He said that because ther are two swing cylinders not working in tandem as in a loader bucket there needs to be a balance to control a violent swing of the boom. With the holes in the restrictor placed as they are it restricts flow in one directon and allows almost full flow in the reverse direction.I just picked up the rechromed swing cylinder rods today with new seals and hope to have the bushings for the trunions soon. I will reinstall the restrictors as they were removed ' floating" and let you know how they work Thanks for all your help.

 

[IceStationZebra]

I thought they floated also, but came across this.

It looks like some of the restrictor have a spring associated with them.

http://www.princehyd.com/Portals/0/Valves.pdf

Pages V10 ,V28

It mentions restrictor and conical spring.

Pairing a suitably stiff spring with a floating restrictor makes it viscosity and velocity sensitive, which can be good or bad depending on what you want. This is basically what is used in forklifts to limit the lowering speed when loaded, but allow unrestricted lowering when unloaded.

ISZ